CN117026103A - Multi-component soft magnetic alloy with high strength, high resistance and low resistance temperature coefficient, and preparation method and application thereof - Google Patents

Abstract

The invention discloses a multi-component soft magnetic alloy with high strength, high resistance and low resistance temperature coefficient and its preparation method and application. It consists of the following components in terms of atomic percentage: Fe 54-60%, Cr 17-26%, Al 9-12%, Ni 1-7%, Co 0-7%, Si 2-5%, Ti 0.5-2%. The alloy prepared by the present invention mainly exhibits a two-phase structure, that is, the cubic B2 nanoprecipitated phase is dispersed in the BCC matrix phase, and the B2 precipitated phase and the BCC matrix exhibit a completely consistent orientation relationship. This structural feature significantly improves the compressive strength of the alloy. and deformability, and improves the resistivity and reduces the temperature coefficient of resistivity; at the same time, the alloy also has lower coercivity and higher saturation magnetization. The alloy preparation process is simple and does not require complex heat treatment. It can be cast after casting. Obtain excellent mechanical, electrical and magnetic properties.

Description

A multi-component soft magnetic alloy with high strength, high resistance and low resistance temperature coefficient and its preparation Methods and applications

Technical field

The invention belongs to the technical field of metal functional material preparation, and specifically relates to a multi-component soft magnetic alloy with high strength, high resistance and low resistance temperature coefficient and its preparation method and application.

Background technique

Soft magnetic materials have the characteristics of low coercivity (Hc≤1000A/m) and high saturation magnetic induction intensity (B). Currently, the most commonly used soft magnetic materials are iron-silicon alloys (silicon steel sheets) and various soft magnetic ferrites. As devices have increasingly higher requirements for miniaturization, signal stability and energy efficiency, higher requirements have been placed on the performance of soft magnetic alloy materials. On the one hand, soft magnetic alloy materials often have low insulation resistance, high transmission losses, and large core heat, which causes device performance to deteriorate; on the other hand, their strong plasticity cannot meet the requirements of complex application environments, and their processability is limited. . At present, many studies have fallen into the dilemma of being unable to balance mechanical properties and electromagnetic properties.

Multi-component high-entropy alloys usually contain four or more components and are valued for their excellent comprehensive properties. The broad composition space and controllable microstructure of high-entropy alloys have great potential to comprehensively improve the mechanical and physical properties of alloys. The invention prepares a multi-component alloy with a two-phase structure, that is, the B2 precipitated phase is dispersed and distributed on the BCC matrix phase. This structural feature significantly improves the compressive strength and deformability of the alloy, increases the resistivity, and reduces the temperature coefficient of resistivity. At the same time, the alloy also has lower coercivity and higher saturation magnetization. The alloy has a simple preparation process and does not require complex heat treatment. It can obtain excellent mechanical and electro-magnetic properties after casting and can be used in precision machine manufacturing and instrument manufacturing in the power industry, mobile communications and other fields.

Contents of the invention

The purpose of this section is to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section, the abstract and the title of the invention to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the invention.

In view of the above and/or problems existing in the prior art, the present invention is proposed.

One of the purposes of the present invention is to provide a multi-component soft magnetic alloy with high strength, high resistance and low resistance temperature coefficient, breaking through the technical bottleneck of a large number of existing soft magnetic alloys with poor strong plasticity and low resistivity. The invented alloy can be used in electric power Precision machine manufacturing and instrument manufacturing in industry, mobile communications and other fields.

In order to solve the above technical problems, the present invention provides the following technical solution: a multi-component soft magnetic alloy with high strength, high resistance and low resistance temperature coefficient, which is composed of the following components in terms of atomic percentage, Fe 54-60%, Cr 17 ~26%, Al 9~12%, Ni 1~7%, Co 0~7%, Si 2~5%, Ti 0.5~2%;

Moreover, the sum of the atomic percentages of Fe, Cr, and Al is ≥ 79% and ≤ 96.5%, the sum of the atomic percentages of Ni and Co is ≥ 1% and ≤ 14%, and the sum of the atomic percentages of Si and Ti is ≥ 2.5% and ≤7%, the sum of the atomic percentages of each component is 100%.

As a preferred version of the multi-component soft magnetic alloy with high strength, high resistance and low temperature coefficient of resistance of the present invention, the alloy has the following characteristics:

(i) Compression yield strength 800~1600Mpa;

(ii) The compressive strength is between 1700 and 3500MPa, and the compressive strain is above 20%;

(iii) The alloy has a resistivity of 140 to 220 μΩ"cm in a wide temperature range below 400°C;

(iv) The temperature coefficient of resistivity is -90~90ppm/℃;

(v) The saturation magnetization of the alloy is 0.8~1.1T, and the coercive force is 50~950A/m.

As a preferred solution of the multi-component soft magnetic alloy with high strength, high resistance and low temperature coefficient of resistance of the present invention, the alloy mainly exhibits a two-phase structure, namely cubic B2 nanometer precipitate phase (the precipitate phase is NiAl-rich phase and is The multi-component precipitated phase) is dispersed in the BCC matrix phase, and the B2 precipitated phase and the BCC matrix show a completely consistent orientation relationship.

As a preferred solution of the multi-component soft magnetic alloy with high strength, high resistance and low temperature coefficient of resistance of the present invention, the alloy is composed of the following components in terms of atomic percentage: Fe 55-58%, Cr 17-26% , Al 10~12%, Ni 2~6%, Co 0~6%, Si 3~5%, Ti 1~2%;

Moreover, the sum of the atomic percentages of Fe, Cr, and Al is ≥ 82% and ≤ 96%, the sum of the atomic percentages of Ni and Co is ≥ 2% and ≤ 12%, and the sum of the atomic percentages of Si and Ti is ≥ 4% and ≤7%, the sum of the atomic percentages of each component is 100%.

As a preferred solution of the multi-component soft magnetic alloy with high strength, high resistance and low temperature coefficient of resistance of the present invention, the alloy is composed of the following components in terms of atomic percentage: Fe 56%, Cr 24%, Al 10% , Ni 5%, Si4%, Ti 1%.

Another object of the present invention is to provide a method for preparing a multi-component soft magnetic alloy with high strength, high resistance and low temperature coefficient of resistance as described above, including:

Weigh each component according to the atomic ratio of the alloy and smelt it under vacuum or inert gas protection conditions to obtain a multi-component soft magnetic alloy with high strength, high resistance and low resistance temperature coefficient.

As a preferred solution for the preparation method of the multi-component soft magnetic alloy with high strength, high resistance and low resistance temperature coefficient of the present invention, the melting is performed under vacuum, and the vacuum degree in the melting furnace is 1 to 0.0001 Pa.

As a preferred solution for the preparation method of the multi-component soft magnetic alloy with high strength, high resistance and low resistance temperature coefficient of the present invention, the melting is carried out in an inert gas atmosphere, and the inert gas pressure in the melting furnace is 0.000001 to 10 MPa.

As a preferred solution for the preparation method of the multi-component soft magnetic alloy with high strength, high resistance and low temperature coefficient of resistance of the present invention, the melting temperature is 1450-2200°C and the temperature is maintained for 0.01-1 hour.

As a preferred solution for the preparation method of the multi-component soft magnetic alloy with high strength, high resistance and low resistance temperature coefficient of the present invention, the raw materials of each component of the alloy are pure metal elements or intermediate alloys, with a purity of ≥99.0wt.%, and repeated Smelt no less than 3 times.

Another object of the present invention is to provide the application of the multi-component soft magnetic alloy with high strength, high resistance and low temperature coefficient of resistance as described above in precision machine manufacturing and/or instrument manufacturing.

Compared with the prior art, the present invention has the following beneficial effects:

The alloy prepared by the present invention mainly exhibits a two-phase structure, that is, the cubic B2 nanoprecipitated phase is dispersed in the BCC matrix phase, and the B2 precipitated phase and the BCC matrix exhibit a completely coherent orientation relationship. This structural feature significantly improves the compressive strength and deformability of the alloy, increases the resistivity, and reduces the temperature coefficient of resistivity; at the same time, the alloy also has lower coercivity and higher saturation magnetization. The alloy has a simple preparation process and does not require complex heat treatment. It can obtain excellent mechanical, electrical and magnetic properties after casting.

Compared with the traditional FeCrAl alloy, the alloy of the present invention does not contain rare metal elements and can be developed into an environment-friendly soft magnetic alloy. The alloy has a simple preparation process and does not require complex heat treatment. It can obtain excellent mechanical, electrical and magnetic properties after casting. It can be used in precision machine manufacturing and instrument manufacturing in the power industry, mobile communications and other fields.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present invention more clearly, the drawings needed to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. Those of ordinary skill in the art can also obtain other drawings based on these drawings without exerting any creative effort. in:

Figure 1 is an XRD spectrum of a multi-component soft magnetic alloy material with high strength, high resistance and low resistance temperature coefficient provided in Embodiment 1 of the present invention.

Figure 2 is an EBSD phase distribution diagram and an inverse pole diagram (IPF) of the multi-component soft magnetic alloy material with high strength, high resistance and low resistance temperature coefficient provided in Embodiment 1 of the present invention.

Figure 3 is a scanning electron microscope morphology diagram of the microstructure of the multi-component soft magnetic alloy material with high strength, high resistance and low resistance temperature coefficient provided in Embodiment 1 of the present invention.

Figure 4 is a high-angle annular dark field (HAADF) image and selected area electron diffraction spectrum under a transmission electron microscope of the multi-component soft magnetic alloy material with high strength, high resistance and low resistance temperature coefficient provided in Embodiment 1 of the present invention.

Figure 5 is a resistivity-temperature curve diagram of the multi-component soft magnetic alloy material with high strength, high resistance and low resistance temperature coefficient provided in Embodiment 1 of the present invention.

Figure 6 is an engineering stress-strain diagram of the multi-component soft magnetic alloy material with high strength, high resistance and low resistance temperature coefficient provided in Embodiment 1 of the present invention.

Figure 7 is a hysteresis loop diagram of the multi-component soft magnetic alloy material with high strength, high resistance and low resistance temperature coefficient provided in Embodiment 1 of the present invention.

Figure 8 is an XRD spectrum of the multi-component soft magnetic alloy material with high strength, high resistance and low resistance temperature coefficient provided in Embodiment 2 of the present invention.

Figure 9 is an EBSD phase distribution diagram and an inverse pole diagram (IPF) of the multi-component soft magnetic alloy material with high strength, high resistance and low resistance temperature coefficient provided in Embodiment 2 of the present invention.

Figure 10 is a scanning electron microscope morphology diagram of the microstructure of the multi-component soft magnetic alloy material with high strength, high resistance and low resistance temperature coefficient provided in Embodiment 2 of the present invention.

Figure 11 is a resistivity-temperature curve diagram of a multi-component soft magnetic alloy material with high strength, high resistance and low resistance temperature coefficient provided in Embodiment 2 of the present invention.

Figure 12 is an engineering stress-strain diagram of the multi-component soft magnetic alloy material with high strength, high resistance and low resistance temperature coefficient provided in Embodiment 2 of the present invention.

Figure 13 is a hysteresis loop diagram of a multi-component soft magnetic alloy material with high strength, high resistance and low resistance temperature coefficient provided in Embodiment 2 of the present invention.

Figure 14 is a scanning electron microscope morphology diagram of the microstructure of the multi-component soft magnetic alloy material with high strength, high resistance and low resistance temperature coefficient provided in Embodiment 3 of the present invention.

Figure 15 is a resistivity-temperature curve diagram of a multi-component soft magnetic alloy material with high strength, high resistance and low resistance temperature coefficient provided in Embodiment 3 of the present invention.

Figure 16 is a compressive engineering stress-strain diagram of the multi-component soft magnetic alloy material with high strength, high resistance and low resistance temperature coefficient provided in Embodiment 3 of the present invention.

Figure 17 is a hysteresis loop diagram of a multi-component soft magnetic alloy material with high strength, high resistance and low resistance temperature coefficient provided in Embodiment 3 of the present invention.

Figure 18 is a scanning electron microscope morphology diagram of the microstructure of the multi-component soft magnetic alloy material with high strength, high resistance and low resistance temperature coefficient provided in Embodiment 4 of the present invention.

Figure 19 is a resistivity-temperature curve diagram of a multi-component soft magnetic alloy material with high strength, high resistance and low resistance temperature coefficient provided in Embodiment 4 of the present invention.

Figure 20 is a compressive engineering stress-strain diagram of the multi-component soft magnetic alloy material with high strength, high resistance and low resistance temperature coefficient provided in Embodiment 4 of the present invention.

Figure 21 is a hysteresis loop diagram of a multi-component soft magnetic alloy material with high strength, high resistance and low resistance temperature coefficient provided in Embodiment 4 of the present invention.

Figure 22 is an XRD spectrum of the alloy material provided in Comparative Example 1.

Figure 23 is a scanning electron microscope morphology diagram of the microstructure of the alloy material provided in Comparative Example 1.

FIG. 24 is a resistivity-temperature curve diagram of the alloy material provided in Comparative Example 1.

Figure 25 is a compressive engineering stress-strain diagram at room temperature of the alloy material provided in Comparative Example 1.

Figure 26 is an XRD spectrum of the alloy material provided in Comparative Example 2.

Figure 27 is a scanning electron microscope morphology diagram of the microstructure of the alloy material provided in Comparative Example 2.

Figure 28 is a resistivity-temperature curve diagram of the alloy material provided in Comparative Example 2.

Figure 29 is a compressive engineering stress-strain diagram at room temperature of the alloy material provided in Comparative Example 2.

Detailed ways

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific implementation modes of the present invention will be described in detail below in conjunction with the examples in the description.

Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Those skilled in the art can do so without departing from the connotation of the present invention. Similar generalizations are made, and therefore the present invention is not limited to the specific embodiments disclosed below.

Second, reference herein to "one embodiment" or "an embodiment" refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

Unless otherwise stated, the raw materials used in the examples were commercially purchased.

Example 1

The ingredients are prepared according to the chemical formula Fe ₅₆ Cr ₂₄ Al ₁₀ Ni ₅ Si ₄ Ti ₁ (at.%). The raw materials use blocks corresponding to each pure element, with a purity greater than 99.0%. The prepared raw materials are then placed in a copper crucible for use. Electric arc furnace smelting. First, high-purity argon gas is introduced into the crucible for purging, repeated three times, and then the high vacuum is evacuated to 5×10 ^-3 Pa, and high-purity argon gas is introduced to maintain the inert gas protection of the smelting at 5×10 ³ Pa. Next, repeat smelting 4 times. The melting temperature is 1600°C and the temperature is maintained for 10 minutes to obtain the alloy in Example 1.

It can be seen from Figures 1 and 2 that the main phase of the obtained multi-component soft magnetic alloy with high strength, high resistance and low temperature coefficient of resistance is a BCC solid solution structure.

As can be seen from Figure 3, there are dispersedly distributed nanoparticles in the multi-component soft magnetic alloy of this embodiment.

As can be seen from Figure 4, the nanoprecipitated phase in the multi-component soft magnetic alloy of this embodiment has a cubic B2 structure, and has a completely coherent orientation relationship with the BCC matrix. The particle size is 25±11nm, and the area percentage is 42%±5%. .

It can be seen from Figure 5 that the room temperature resistivity of the multi-component soft magnetic alloy of this embodiment can be as high as ~145 μΩ.cm, and it still remains at ~146 μΩ.cm when the temperature is raised to 673K. The temperature coefficient of resistivity in the temperature range from room temperature to 673K is as low as 17±10ppm/℃.

It can be seen from Figure 6 that the compressive yield strength of the multi-component soft magnetic alloy of this embodiment is approximately 1179MPa, the compressive strength exceeds 2000MPa, and the compressive strain exceeds 30%.

As can be seen from Figure 7, the saturation magnetization of the multi-component alloy is approximately 0.89T, and the coercive force is approximately 593A/m.

Example 2

According to the chemical formula Fe ₅₆ Cr ₁₉ Al ₁₀ Ni ₅ Co ₅ Si ₄ Ti ₁ (at.%), the raw materials are made of blocks corresponding to each pure element, with a purity greater than 99.0%, and then the prepared raw materials are placed in a copper crucible It is smelted in an electric arc furnace. First, high-purity argon gas is introduced into the crucible for purging, repeated three times, and then the high vacuum is evacuated to 5×10 ^-3 Pa, and high-purity argon gas is introduced to maintain the inert gas protection of the smelting at 5×10 ³ Pa. Next, repeat smelting 4 times. The melting temperature is 1600°C and the temperature is maintained for 10 minutes to obtain the alloy in Example 2.

It can be seen from Figures 8 and 9 that the main phase of the obtained multi-component soft magnetic alloy with high strength, high resistance and low temperature coefficient of resistance is a BCC solid solution structure.

It can be seen from Figure 10 that there are dispersedly distributed nanoparticles in the multi-component soft magnetic alloy of this embodiment.

It can be seen from Figure 11 that the room temperature resistivity of the multi-component soft magnetic alloy of this embodiment is ~139 μΩ.cm, and it is still maintained at ~142 μΩ.cm when the temperature is raised to 400°C. The temperature coefficient of resistivity in the temperature range from room temperature to 400℃ is 73±10ppm/℃.

It can be seen from Figure 12 that the compressive yield strength of the multi-component soft magnetic alloy of this embodiment is approximately 1240MPa, the compressive strength is 2030MPa, and the compressive strain is approximately 20%.

As can be seen from Figure 13, the saturation magnetization of this multi-component alloy is approximately 0.96T, and the coercive force is approximately 922A/m.

Example 3

According to the chemical formula Fe ₅₇ Cr ₂₆ Al _10.5 Ni ₂ Si ₃ Ti _1.5 (at.%), the raw materials are prepared in blocks corresponding to each pure element, with a purity greater than 99.0%. The prepared raw materials are then placed in a copper crucible for use. Electric arc furnace smelting. First, high-purity argon gas is introduced into the crucible for purging, repeated three times, and then the high vacuum is evacuated to 5×10 ^-3 Pa, and high-purity argon gas is introduced to maintain the inert gas protection of the smelting at 5×10 ³ Pa. Next, repeat smelting 4 times. The melting temperature is 1600°C and the temperature is maintained for 10 minutes to obtain the alloy in Example 3.

It can be seen from Figure 14 that there are dispersed nanoparticles in the obtained multi-component soft magnetic alloy with high strength, high resistance and low resistance temperature coefficient.

As can be seen from Figure 15, the room temperature resistivity of the soft magnetic alloy can be as high as ~161 μΩ.cm, and it still remains at ~157 μΩ.cm when the temperature is raised to 400°C. The temperature coefficient of resistivity in the temperature range from room temperature to 400℃ is as low as -58ppm/℃.

As can be seen from Figure 16, the compressive yield strength of the soft magnetic alloy is approximately 1088MPa, the compressive strength exceeds 2000MPa, and the compressive strain exceeds 30%.

As can be seen from Figure 17, the saturation magnetization of this multi-component alloy is approximately 0.83T, and the coercive force is approximately 113A/m.

Example 4

According to the chemical formula Fe ₅₇ Cr ₂₄ Al ₁₀ Ni ₂ Co ₂ Si ₄ Ti ₁ (at.%), the raw materials are prepared in blocks corresponding to each pure element, with a purity greater than 99.0%. The prepared raw materials are then placed in a copper crucible It is smelted in an electric arc furnace. First, high-purity argon gas is introduced into the crucible for purging, repeated three times, and then the high vacuum is evacuated to 5×10 ^-3 Pa, and high-purity argon gas is introduced to maintain the inert gas protection of the smelting at 5×10 ³ Pa. Next, repeat smelting 4 times. The melting temperature is 1600°C and the temperature is maintained for 10 minutes to obtain the alloy in Example 4.

It can be seen from Figure 18 that the alloy obtained in Example 4 has signs of nanoparticles.

It can be seen from Figure 19 that the room temperature resistivity of the alloy obtained in the example is approximately 162 μΩ.cm. The temperature coefficient of resistivity in the temperature range from room temperature to 400°C is approximately -83ppm/°C.

It can be seen from Figure 20 that the compressive yield strength of the alloy obtained from this screening test is approximately 818MPa, the compressive strength is approximately 1701MPa, and the compressive strain is approximately 25%.

As can be seen from Figure 21, the saturation magnetization of the multi-component alloy is approximately 0.83T, and the coercive force is approximately 78A/m.

Comparing Examples 1, 2, 3 and 4, it can be seen that the multi-component alloy prepared by the method provided by the present invention has a two-phase structure, that is, a cubic B2 nanodispersed phase that is completely consistent with the BCC matrix phase, so that the alloy has high strength. While maintaining high resistivity and low temperature coefficient of resistivity within 400°C. At the same time, it provides lower coercive force and higher saturation magnetic induction intensity. Comparing Examples 1 and 3, it can be seen that the Ni content has changed from 2% to 5%, which has a great impact on regulating the electromagnetic properties of the alloy. Reasonable control of the Ni content can comprehensively improve the performance of the alloy. Comparing Examples 3 and 4, it can be seen that the introduction of Co element damages the plasticity of the alloy, and the optimization of the electromagnetic properties is not obvious.

Comparative example 1

The ingredients are prepared according to the chemical formula Fe ₅₆ Cr ₂₄ Al ₁₀ Ni ₅ Si ₄ Ti ₁ (at.%). The raw materials use blocks corresponding to each pure element, with a purity greater than 99.0%. The prepared raw materials are then placed in a copper crucible for use. Electric arc furnace smelting. First, high-purity argon gas is introduced into the crucible for purging, repeated three times, and then the high vacuum is evacuated to 5×10 ^-3 Pa, and high-purity argon gas is introduced to maintain the inert gas protection of the smelting at 5×10 ³ Pa. Next, repeat smelting 4 times. The melting temperature is 1600°C and the temperature is maintained for 10 minutes to obtain a cast slab. Use wire cutting to cut small pieces and perform high-temperature homogenization treatment under vacuum conditions at a temperature of 1373K. The homogenization treatment time is 2 hours and then oil quenched to obtain the alloy of Comparative Example 1.

It can be seen from Figure 22 that the alloy obtained in Comparative Example 1 exhibits a single-phase BCC structure.

Figure 23 further confirms that there is no dispersed nano-precipitated phase in this comparative example.

As can be seen from Figure 24, the temperature coefficient of resistivity in the temperature range from room temperature to 400°C is -21±10ppm/°C.

As can be seen from Figure 25, the compressive yield strength of the comparative alloy is approximately 1088MPa, the compressive strength is only 1636MPa, and the compressive strain is less than 15%.

Comparative example 2

According to the chemical formula Fe ₅₆ Cr ₁₉ Al ₁₀ Ni ₅ Co ₅ Si ₄ Ti ₁ (at.%), the raw materials are prepared in blocks corresponding to each pure element, with a purity greater than 99.0%, and then the prepared raw materials are placed in a copper crucible It is smelted in an electric arc furnace. First, high-purity argon gas is introduced into the crucible for purging, repeated three times, and then the high vacuum is evacuated to 5×10 ^-3 Pa, and high-purity argon gas is introduced to maintain the inert gas protection of the smelting at 5×10 ³ Pa. Next, repeat smelting 4 times. The melting temperature is 1600°C and the temperature is maintained for 10 minutes to obtain a cast slab. Use wire cutting to cut small pieces and perform high-temperature homogenization treatment under vacuum conditions at a temperature of 1373K. The homogenization treatment time is 2 hours and then oil quenched to obtain the alloy of Comparative Example 2.

It can be seen from Figure 26 that the alloy obtained in Comparative Example 2 has a single-phase BCC structure.

Figure 27 further confirms that there is no dispersed nano-precipitated phase in this comparative example.

It can be seen from Figure 28 that the temperature coefficient of resistivity of the alloy obtained in this comparative example is approximately 8 ppm/°C in the temperature range from room temperature to 400°C.

It can be seen from Figure 29 that the compressive yield strength of the alloy obtained in this comparative example is much lower than the strength of the example.

Comparing the examples and the comparative examples, it can be seen that when the alloy has a single-phase structure, although the resistance performance of the comparative example is improved, the strength and plasticity are very poor, indicating that without using the method of the present invention, it is difficult to obtain comprehensively improved mechanical and electrical properties. -Magnetic properties.

The high-strength, high-resistance, low-resistance temperature coefficient multi-component soft magnetic alloy prepared by the present invention has the following characteristics: first, compared with traditional soft magnetic alloys, the multi-component soft magnetic alloy has a broad composition space and a controllable microstructure. . Secondly, by combining the advantages of traditional silicon steel and FeCrAl resistance alloy, on the basis of ferrite, alloying elements such as Al, Ni, Co, Ti, and Si are introduced. On the one hand, Al and Ni elements promote the formation of the ordered structure of the B2 phase. This B2 nanoprecipitated phase has a completely consistent relationship with the BCC matrix, which improves the strong plasticity of the alloy without losing or minimizing the loss of soft magnetic properties; on the other hand, On the one hand, elements such as Cr, Al, and Si are beneficial to improving the resistivity of the alloy. Furthermore, the atomic radii of Al, Si, and Ti are quite different from those of Fe, Cr, Co, and Ni, which produces large lattice distortion in the BCC matrix to hinder dislocation movement and effectively improve the solid solution strengthening effect. In addition, compared with traditional FeCrAl alloys, this alloy does not contain rare metal elements and can be developed into an environmentally friendly soft magnetic alloy. The alloy has a simple preparation process and does not require complex heat treatment. It can obtain excellent mechanical, electrical and magnetic properties after casting. It can be used in precision machine manufacturing and instrument manufacturing in the power industry, mobile communications and other fields.

It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solution of the present invention can be carried out. Modifications or equivalent substitutions without departing from the spirit and scope of the technical solution of the present invention shall be included in the scope of the claims of the present invention.

Claims (9)

1. A multi-component soft magnetic alloy with high strength, high resistance and low resistance temperature coefficient is characterized in that: the alloy consists of, by atomic percentage, 54-60% of Fe, 17-26% of Cr, 9-12% of Al, 1-7% of Ni, 0-7% of Co, 2-5% of Si and 0.5-2% of Ti;

and the sum of the atomic percentages of Fe, cr and Al is more than or equal to 79% and less than or equal to 96.5%, the sum of the atomic percentages of Ni and Co is more than or equal to 1% and less than or equal to 14%, the sum of the atomic percentages of Si and Ti is more than or equal to 2.5% and less than or equal to 7%, and the sum of the atomic percentages of all components is 100%.

2. The high strength high resistance low resistance temperature coefficient multicomponent soft magnetic alloy as defined in claim 1, wherein: the alloy has the following characteristics:

(i) The compression yield strength is 800-1600 Mpa;

(ii) Compressive strength is 1700-3500 MPa, and compressive strain is above 20%;

(iii) The resistivity of the alloy is 140-220 mu omega cm in a wide temperature range below 400 ℃;

(iv) The temperature coefficient of resistivity is-90 ppm/DEG C;

(v) The saturation magnetization of the alloy is 0.8-1.1T, and the coercive force is 50-950A/m.

3. The method for preparing the multi-component soft magnetic alloy with high strength, high resistance and low resistance temperature coefficient according to claim 1, which is characterized in that: the alloy consists of, by atomic percentage, 55-58% of Fe, 17-26% of Cr, 10-12% of Al, 2-6% of Ni, 0-6% of Co, 3-5% of Si and 1-2% of Ti;

and the sum of the atomic percentages of Fe, cr and Al is more than or equal to 82% and less than or equal to 96%, the sum of the atomic percentages of Ni and Co is more than or equal to 2% and less than or equal to 12%, the sum of the atomic percentages of Si and Ti is more than or equal to 4% and less than or equal to 7%, and the sum of the atomic percentages of all components is 100%.

4. A method for producing a multi-component soft magnetic alloy of high strength, high resistance and low temperature coefficient of resistance according to any one of claims 1 to 3, characterized in that: comprising the steps of (a) a step of,

weighing the components according to the atomic ratio of the alloy, and smelting under the protection of vacuum or inert gas to obtain the multi-component soft magnetic alloy with high strength, high resistance and low resistance temperature coefficient.

5. The method for preparing the multi-component soft magnetic alloy with high strength, high resistance and low resistance temperature coefficient according to claim 4, which is characterized in that: the smelting is carried out under vacuum, and the vacuum degree in a smelting furnace is 1-0.0001 Pa.

6. The method for preparing the multi-component soft magnetic alloy with high strength, high resistance and low resistance temperature coefficient according to claim 4 or 5, which is characterized in that: the smelting is carried out in an inert gas atmosphere, and the inert gas pressure in a smelting furnace is 0.000001-10 megapascals.

7. The method for preparing the multi-component soft magnetic alloy with high strength, high resistance and low resistance temperature coefficient according to claim 6, which is characterized in that: the smelting temperature is 1450-2200 ℃, and the heat preservation is carried out for 0.01-1 hour.

8. The method for producing a multi-component soft magnetic alloy of any one of claims 4, 5 and 7, wherein: the raw materials of each component of the alloy adopt pure metal elements or intermediate alloy, the purity is more than or equal to 99.0wt.%, and the smelting is repeated for not less than 3 times.

9. Use of a high strength high resistance low temperature coefficient of resistance multicomponent soft magnetic alloy according to any one of claims 1 to 3 in precision machine manufacturing and/or meter manufacturing.