CN114602972B - A high-plasticity isotropic magnesium alloy sheet and preparation method thereof - Google Patents
A high-plasticity isotropic magnesium alloy sheet and preparation method thereof Download PDFInfo
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- CN114602972B CN114602972B CN202210235032.4A CN202210235032A CN114602972B CN 114602972 B CN114602972 B CN 114602972B CN 202210235032 A CN202210235032 A CN 202210235032A CN 114602972 B CN114602972 B CN 114602972B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/04—Alloys based on magnesium with zinc or cadmium as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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Abstract
本发明涉及一种高塑性各向同性镁合金板材及其制备方法，以Mg‑Zn‑RE系或Mg‑Zn‑Ca系镁合金热轧板材的轧向为0°基准，以5‑90°为间隔切取一系列切片薄板S1、S2……Sn；将切片薄板表面进行机械打磨/酸洗去锈、清洗脱脂后按顺序将切片薄板进行堆叠，采用金属丝对堆叠后的板材头尾进行捆扎；之后在150‑275℃进行温轧变形，道次变形量为20‑70％，道次间不进行保温或退火处理；再在20‑50℃进行冷轧变形，道次变形量为5‑10％；最后在300‑400℃下进行退火热处理30min‑2h。本发明制备板材具有力学性能各向同性、高塑性和弱织构的特点，生产过程简洁高效、自动化程度高，力学性能稳定、可制备不同厚度、宽幅、大尺寸镁合金卷板。
The present invention relates to a high-plasticity isotropic magnesium alloy sheet and a preparation method thereof. The rolling direction of a hot-rolled sheet of a Mg-Zn-RE series or Mg-Zn-Ca series magnesium alloy is taken as a 0° reference, and a series of sliced thin plates S1, S2, ... Sn are cut at intervals of 5-90°; the surface of the sliced thin plates is mechanically polished/pickled to remove rust, cleaned and degreased, and then the sliced thin plates are stacked in sequence, and the stacked sheet heads and tails are bundled with metal wires; then warm rolling deformation is performed at 150-275°C, the deformation amount of each pass is 20-70%, and no insulation or annealing treatment is performed between passes; then cold rolling deformation is performed at 20-50°C, the deformation amount of each pass is 5-10%; and finally annealing heat treatment is performed at 300-400°C for 30min-2h. The sheet prepared by the present invention has the characteristics of isotropic mechanical properties, high plasticity and weak texture, the production process is simple and efficient, the degree of automation is high, the mechanical properties are stable, and magnesium alloy coils of different thicknesses, widths and large sizes can be prepared.
Description
Technical Field
The invention belongs to the technical field of metal material preparation, and particularly relates to a high-plasticity isotropic magnesium alloy plate and a preparation method thereof.
Background
The magnesium alloy material has a series of advantages of light weight, high specific strength, good electromagnetic shielding performance and the like as a 21 st century green engineering material, and is attracting more and more attention in aerospace, transportation and 3C communication electronic products. However, since magnesium alloy belongs to HCP crystal structure, symmetry is low, and there is a large anisotropy of mechanical properties, the difference of tensile yield strength and elongation in rolling direction and transverse direction is large for rolled plate. Taking the more studied Mg-Zn-Ce alloy (ZEK 100) as an example, the room temperature tensile yield strength and the elongation of the conventional rolled plate are about 175MPa/25% and 120MPa/35% respectively along the rolling direction and the transverse direction of the plate. The room-temperature tensile yield strength and the elongation of the rare earth magnesium alloy Mg-2Zn-0.8Gd alloy rolled plate are respectively about 120MPa/36% and 80MPa/48% along the rolling direction and the transverse direction of the plate. The anisotropism of the typical rare earth magnesium alloy can cause uneven yield phenomenon in the subsequent service process or obvious lug making phenomenon in the stamping forming process, so that the problems of material waste, increased cutting procedures and the like are caused.
Research shows that the room temperature high plasticity of rare earth magnesium alloy is mainly caused by the rare earth texture formed by rolling a plate and deflected transversely to the rolling of the plate. Under the rare earth texture condition, the transverse basal plane slippage and stretching twinning of the plate are easier to start, so that the yield strength in the direction is lower, the work hardening capacity is high, the room-temperature stretching elongation is high, and the yield strength is high and the elongation is lower in the rolling direction. Researches show that the anisotropic of the mechanical properties can be restrained by the cross rolling process of changing the rolling direction and the transverse direction of each pass, but the actual preparation process needs to change the rolling direction and the transverse direction of the plate in each pass, has complex operation, low efficiency and is limited by the width of a rolling mill, can only produce single magnesium alloy plates, cannot produce large-size coiled plates, and has limited practical application. Therefore, the development of the high-plasticity isotropic magnesium alloy sheet and the preparation method thereof have important engineering values for expanding the application of the magnesium alloy.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the application and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the application and in the title of the application, which may not be used to limit the scope of the application.
The present invention has been made in view of the above and/or problems occurring in the prior art.
The invention aims to provide a high-plasticity isotropic magnesium alloy sheet and a preparation method thereof, the invention utilizes a superposition warm rolling technology to regulate and control the thermal deformation and recrystallization behaviors of grains with different orientations through an innovative rolling process, the distribution of textures in all directions of a rolled plate is regulated and controlled through the superposition warm rolling technology of slice sheets with different angles, and the grain size of the magnesium alloy is refined, so that isotropy of mechanical properties and high plasticity at room temperature are obtained.
In order to solve the technical problems, the invention provides a high-strength Gao Chengxing-property magnesium alloy sheet and a preparation method thereof, comprising,
The preparation method of the high-plasticity isotropic magnesium alloy sheet is characterized in that a) the high-plasticity isotropic magnesium alloy sheet has a yield strength difference ratio (sigma smax-σsmin)/σsmax is less than 5 percent, room temperature tensile plasticity is more than 30 percent, and a basal plane polar texture strength peak value is less than 4.5) of room temperature tensile yield strength along the rolling direction, the transverse direction and the 45 DEG direction, and b) the preparation method of the magnesium alloy sheet comprises the following steps:
1) Preparing an ingot;
2) Solution treatment and hot rolling deformation;
3) The warm rolling and annealing treatment comprises the steps of cutting a series of slice sheets S1 and S2 according to the standard of rolling direction of 0 degree and with 5-90 degrees as intervals, grinding the upper surface, the lower surface and the side surface of the slice sheets to remove oxide skin, stacking the slice sheets sequentially, binding the head and the tail of the stacked sheet by metal wires, performing warm rolling deformation at 150-275 ℃, wherein the pass deformation is 20-70%, heat preservation or annealing treatment is not performed between passes, performing cold rolling deformation at 20-50 ℃, the pass deformation is 5-10%, and finally performing annealing heat treatment at 300-400 ℃ for 30min-2h.
The high-plasticity isotropic magnesium alloy plate and the preparation method thereof are characterized in that the magnesium alloy is a Mg-Zn-RE system with low rare earth content, RE is Gd, ce or Y, and RE content is lower than 1 percent (wt.%), or a Mg-Zn-Ca system magnesium alloy.
The high-plasticity isotropic magnesium alloy sheet and the preparation method thereof are characterized in that the ingot casting is prepared by adopting a metal mold, a sand mold or a semi-continuous casting method;
The high-plasticity isotropic magnesium alloy sheet material and the preparation method thereof are characterized in that in the step 2), the solid solution treatment is carried out on square blanks at 400-480 ℃ for 8-12 hours, oxide scales and chamfers are removed, the hot rolling deformation is carried out at 300-450 ℃, the rolling deformation of each pass is 15-50%, the heat preservation is carried out for 15-30 minutes between passes, the total deformation of the rolling process is 80-90%, and the hot rolled sheet material is annealed at 325-400 ℃ for 0.5-1.5 hours.
The high-plasticity isotropic magnesium alloy sheet and the preparation method thereof are characterized in that the thickness of the hot rolled sheet slice sheet is 1-5mm.
The high-plasticity isotropic magnesium alloy sheet and the preparation method thereof are characterized in that all stacked slice sheets are cut anticlockwise or clockwise, and the included angle between the stacked slice sheets and the rolling direction 0 degree standard needs to cover all 0-180 degrees.
The high-plasticity isotropic magnesium alloy sheet material and the preparation method thereof are characterized in that the surfaces of all stacked slice sheets are mechanically polished/pickled, derusted, cleaned and degreased, stacked together and then subjected to superposition rolling treatment.
The high-plasticity isotropic magnesium alloy sheet and the preparation method thereof are characterized in that in the cold rolling deformation, the accumulated cold rolling deformation is 10-20%, and the cold rolling deformation direction is consistent with the overlapping warm rolling direction or is 180 degrees.
The design principle of the invention is as follows:
The conventional Mg-Zn-RE/Ca magnesium alloy can form a rare earth texture deflected transversely along rolling after conventional rolling deformation, and the texture is favorable for the starting of basal plane slippage and stretching twinning in the magnesium alloy, so that the room-temperature stretching plasticity of the magnesium alloy is improved, but the transverse deflected rare earth texture also causes the high anisotropy of the mechanical property of the magnesium alloy, uneven yield and stamping lug phenomena are easy to occur, and engineering requirements are difficult to meet. According to the invention, the hot rolled plate is cut into the slice sheets deviating from the original rolling direction at different angles, and the superposition warm rolling is carried out, so that the aim of regulating and controlling the texture distribution is fulfilled. The research shows that the texture of the rare earth magnesium alloy is controlled by the deformation and recrystallization processes, deformation structures and local recrystallization structures can be generated in the warm rolling process, when plates in different directions are stacked, deformation mechanisms started in warm rolling are different due to different stress and different stress strain states of the plates in different directions, so that the deformation structures and the recrystallization structures with different characteristics are obtained, deformation energy storage in the grain structures with different orientations can be further improved through cold rolling deformation, the mutual influence of the deformation structures and the recrystallization structures in the final annealing recrystallization process of the plates can lead the texture of the final plates to be more discrete and evenly distributed in different directions of the plates, and the preferential orientation in a certain direction under the conventional process condition is avoided. In addition, the high Z parameter and the accumulated strain can be realized by carrying out the superposition warm rolling and cold rolling process at a low temperature, and grains with finer size can be obtained in the magnesium alloy, so that the plasticity and the yield strength of the plate are improved.
The technical effects of the present invention or advantages of the present invention over the prior art are described, and the effects achieved by the present invention are described with specific data, and are specifically and practically described.
(1) The invention provides a preparation method of a high-plasticity isotropic magnesium alloy sheet. The sheet material slice can be produced and prepared with high efficiency after superposition, the degree of automation is high, the method is simpler and more efficient than the cross rolling of frequently changing the rolling direction, the large-size magnesium alloy coiled sheet can be prepared, the rolling deformation capacity of the sheet material is good, the sheet material is less or no edge crack during warm rolling or cold rolling, the procedures of edge cutting and the like are avoided, the mechanical property of the prepared magnesium alloy sheet material is isotropic, the yield strength is high, and the mechanical property of the sheet material is stable in the rolling and uncoiling processes.
(2) The magnesium alloy sheet prepared by the superposition warm rolling and cold rolling process has fine and uniform grain size, and better toughness than the sheet prepared by the traditional cross rolling process.
(3) Compared with cross rolling and other patents, the method can be used for preparing the magnesium alloy sheet with adjustable width, thickness and length, isotropic mechanical properties and capability of meeting the requirements of continuous stamping production lines on the specification and performance of the magnesium alloy sheet.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a drawing showing the method for sampling and stacking the high-plasticity isotropic magnesium alloy.
FIG. 2 is a photograph of the microstructure of a sheet prepared in example 1 of the present invention.
FIG. 3 is a graph showing the tensile mechanical properties at room temperature of a sheet prepared in example 4 of the present invention. As can be seen, the sheet material has substantially similar yield strength and elongation, and exhibits isotropy in the mechanical properties.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The following detailed description is made in connection with specific embodiments.
Example 1
(1) Adopts a metal mold casting method to prepare the alloy with the chemical composition of Mg-1.9Zn-0.8 Gd. Square stock of a certain thickness is cut from the ingot.
(2) The square blank is subjected to solution treatment at 450 ℃ for 10 hours to remove oxide scales and chamfer angles, hot rolling deformation is carried out, the rolling deformation of each pass of deformation is 20-40%, the heat preservation between passes is carried out for 15-30 minutes, the total deformation of the rolling process is 80-90%, and the hot rolled plate is annealed at 350 ℃ for 1 hour.
(3) Cutting a series of slice sheets S1 and S2 according to the standard of 0 degree in the rolling direction, cutting the slice sheets S13 at intervals of 15 degrees, wherein the thickness of the slice sheets is 1mm, stacking the slice sheets in sequence after mechanically polishing/pickling and derusting, cleaning and degreasing the surfaces of the slice sheets, bundling the stacked sheets by using metal wires, performing warm rolling deformation at 200 ℃, wherein the deformation amount of the former three times is 40-70%, continuously rolling, performing no heat preservation or annealing treatment between the times, the subsequent rolling deformation amount is 20-40%, performing cold rolling deformation when the temperature of the sheet is reduced to 20-50 ℃, performing pass deformation to 5-10%, accumulating cold rolling deformation amount is 15%, and performing annealing heat treatment at 300 ℃ for 2 hours after rolling is completed.
(4) According to the national standard, the prepared magnesium alloy plate has room temperature tensile yield strength and elongation of 180MPa/35%,175MPa/36% and 178MPa/34% along the rolling direction and the transverse direction at 45 degrees, and the texture peak strength of (0002) basal polar diagram is 3.2m.r.d. The mechanical properties of the sheet material are isotropic.
Example 2
(1) Adopts a metal mold casting method to prepare the alloy with the chemical composition of Mg-1.9Zn-0.8 Gd. Square stock of a certain thickness is cut from the ingot.
(2) The square blank is subjected to solution treatment at 420 ℃ for 12 hours to remove oxide scales and chamfer angles, hot rolling deformation is carried out, the rolling deformation of each pass of deformation is 20-40%, the heat preservation between passes is carried out for 15-30 minutes, the total deformation of the rolling process is 80-90%, and the hot rolled plate is annealed at 350 ℃ for 1 hour.
(3) Cutting a series of slice sheets S1, S2 and S3 in the sheet material with the rolling direction of 0 degree as a standard and with the interval of 90 degrees, wherein the thickness of the slice sheet is 5mm, stacking the slice sheets in sequence after mechanically polishing/pickling and derusting, cleaning and degreasing the surface of the slice sheet, bundling the stacked sheet material head and tail by using metal wires, performing warm rolling deformation at 275 ℃, wherein the deformation amount of the first three times is 30-60%, continuously rolling, performing no heat preservation or annealing treatment between the times, performing cold rolling deformation at 20-30% when the temperature of the sheet material is reduced to 20-50 ℃, performing pass deformation at 5-10%, accumulating cold rolling deformation amount at 20%, and performing annealing heat treatment at 350 ℃ for 1.5h after the rolling is completed.
(4) According to the national standard, the prepared magnesium alloy plate has the room-temperature tensile yield strength and the elongation rate of 185MPa/33%,188MPa/33% and 184MPa/32% along the rolling direction and the transverse direction at 45 degrees respectively, and the texture peak strength of the (0002) basal polar diagram is 3.9m.r.d. The mechanical properties of the sheet material are isotropic.
Example 3
(1) Adopts a metal mold casting method to prepare the alloy with the chemical composition of Mg-1.5Zn-0.5 Ce. Square stock of a certain thickness is cut from the ingot.
(2) The square blank is subjected to solution treatment at 410 ℃ for 10 hours to remove oxide scales and chamfer angles, hot rolling deformation is carried out, the rolling deformation of each pass of deformation is 20-35%, the heat preservation between passes is carried out for 15-30 minutes, the total deformation of the rolling process is 80-90%, and the hot rolled plate is annealed at 350 ℃ for 1 hour.
(3) Cutting a series of slice sheets S1 and S2 according to the standard of 0 degree in the rolling direction, cutting the slice sheets S7 at intervals of 30 degrees, wherein the thickness of the slice sheets is 1.5mm, stacking the slice sheets in sequence after mechanically polishing/pickling and derusting, cleaning and degreasing the surfaces of the slice sheets, bundling the stacked sheets by using metal wires, performing warm rolling deformation at 150 ℃, wherein the deformation amount of the former three times is 30-50%, continuously rolling, performing no heat preservation or annealing treatment among the times, the subsequent rolling deformation amount is 20-30%, performing cold rolling deformation when the temperature of the sheet is reduced to 20-50 ℃, performing pass deformation to 5-10%, accumulating cold rolling deformation amount to 10%, and performing annealing heat treatment at 325 ℃ for 1h after the rolling is completed.
(4) According to the national standard, the prepared magnesium alloy plate has room temperature tensile yield strength and elongation of 159MPa/36%,162MPa/36% and 163MPa/34% along the rolling direction and the transverse direction at 45 degrees, and the texture peak strength of the (0002) basal polar diagram is 2.8m.r.d. The mechanical properties of the sheet material are isotropic.
Example 4
(1) Adopts a metal mold casting method to prepare the alloy with the chemical composition of Mg-0.8Zn-0.15 Ca. Square stock of a certain thickness is cut from the ingot.
(2) The square blank is subjected to solution treatment at 400 ℃ for 8 hours to remove oxide scales and chamfer angles, hot rolling deformation is carried out, the rolling deformation of each pass is 15-40%, the heat preservation is carried out between passes for 15-30 minutes, the total deformation of the rolling process is 80-90%, and the hot rolled plate is annealed at 325 ℃ for 1.5 hours.
(3) Cutting a series of slice sheets S1, S2 and S5 at intervals of 45 degrees in the sheet material according to the rolling direction of 0 degrees, wherein the thickness of the slice sheet is 1.5mm, stacking the slice sheets in sequence after mechanically polishing/pickling and derusting, cleaning and degreasing the surfaces of the slice sheets, bundling the stacked sheet material head and tail by using metal wires, performing warm rolling deformation at 200 ℃, wherein the deformation amount of the former three times is 30-50%, continuous rolling is performed, heat preservation or annealing treatment is not performed between the times, the subsequent rolling deformation amount is 20-30%, cold rolling deformation is performed when the temperature of the sheet material is reduced to 20-50 ℃, the pass deformation is 5-10%, the accumulated cold rolling deformation amount is 15%, and annealing heat treatment is performed at 400 ℃ for 0.5h after the rolling is completed.
(4) According to the national standard, the prepared magnesium alloy plate has room temperature tensile yield strength and elongation of 154MPa/33%,149MPa/34% and 148MPa/34% respectively along the rolling direction and the transverse direction at 45 degrees, and the texture peak strength of the (0002) basal polar diagram is 3.4. The mechanical properties of the sheet material are isotropic.
Example 5
(1) Adopts a metal mold casting method to prepare the alloy with the chemical composition of Mg-1.3 Zn-0.6Y. Square stock of a certain thickness is cut from the ingot.
(2) The square blank is subjected to solution treatment at 420 ℃ for 8 hours to remove oxide scales and chamfer angles, hot rolling deformation is carried out, the rolling deformation of each pass of deformation is 20-35%, the heat preservation between passes is carried out for 15-30 minutes, the total deformation of the rolling process is 80-90%, and the hot rolled plate is annealed at 400 ℃ for 0.5 hours.
(3) Cutting a series of slice sheets S1, S2 and S5 at intervals of 45 degrees in the sheet material according to the rolling direction of 0 degrees, wherein the thickness of the slice sheet is 1.0mm, stacking the slice sheets in sequence after mechanically polishing/pickling and derusting, cleaning and degreasing the surfaces of the slice sheets, bundling the stacked sheet material head and tail by using metal wires, performing warm rolling deformation at 250 ℃, wherein the deformation amount of the first three times is 30-60%, continuous rolling is performed, heat preservation or annealing treatment is not performed between the times, the subsequent rolling deformation amount is 20-30%, cold rolling deformation is performed when the temperature of the sheet material is reduced to 20-50 ℃, the pass deformation is 5-10%, the accumulated cold rolling deformation amount is 20%, and annealing heat treatment is performed at 400 ℃ for 0.5h after the rolling is completed.
(4) According to the national standard, the prepared magnesium alloy plate has the room-temperature tensile yield strength and the elongation rate of 145MPa/35%,144MPa/37% and 138MPa/34% along the rolling direction, the transverse direction and 45 degrees respectively, and the texture peak strength of (0002) basal polar diagram is 3.7. The mechanical properties of the sheet material are isotropic.
Comparative example 1
(1) Adopts a metal mold casting method to prepare the alloy with the chemical composition of Mg-1.9Zn-0.8 Gd. Square stock of a certain thickness is cut from the ingot.
(2) The square blank is subjected to solution treatment at 450 ℃ for 10 hours to remove oxide scales and chamfer angles, hot rolling deformation is carried out, the rolling deformation of each pass of deformation is 20-40%, the heat preservation between passes is carried out for 15-30 minutes, the total deformation of the rolling process is 80-90%, and the hot rolled plate is annealed at 350 ℃ for 1 hour.
(3) Cutting 3 parallel slice sheets S1, S2 and S3 along the rolling direction, wherein the thickness of the slice sheet is 2mm, stacking the slice sheets sequentially after mechanically polishing/pickling, derusting, cleaning and degreasing the surfaces of the slice sheets, bundling the stacked sheets by metal wires, performing warm rolling deformation at 250 ℃, wherein the deformation amount of the first three times is 30-50%, continuous rolling is performed, heat preservation or annealing treatment is not performed between the times, the subsequent rolling deformation amount is 20-30%, cold rolling deformation is performed when the temperature of the sheet is reduced to 20-50 ℃, the pass deformation amount is 5-10%, the accumulated cold rolling deformation amount is 20%, and annealing heat treatment is performed at 350 ℃ for 1h after the rolling is completed.
(4) According to the national standard, the prepared magnesium alloy plate has room temperature tensile yield strength and elongation of 142MPa/30%,96MPa/45% and 101MPa/32% along the rolling direction, the transverse direction and 45 degrees respectively, and the texture peak strength of (0002) basal polar diagram is 4.8. The sheet material exhibits significant mechanical anisotropy.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
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