CN1321219C - Axially oriented directional solidification process in magnetic field - Google Patents
Axially oriented directional solidification process in magnetic field Download PDFInfo
- Publication number
- CN1321219C CN1321219C CNB2005100293041A CN200510029304A CN1321219C CN 1321219 C CN1321219 C CN 1321219C CN B2005100293041 A CNB2005100293041 A CN B2005100293041A CN 200510029304 A CN200510029304 A CN 200510029304A CN 1321219 C CN1321219 C CN 1321219C
- Authority
- CN
- China
- Prior art keywords
- magnetic field
- directional solidification
- easy axis
- solidification
- directional
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000007711 solidification Methods 0.000 title claims abstract description 82
- 230000008023 solidification Effects 0.000 title claims abstract description 82
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000008569 process Effects 0.000 title description 4
- 239000000155 melt Substances 0.000 claims abstract description 9
- 230000008018 melting Effects 0.000 claims abstract description 6
- 238000002844 melting Methods 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 238000004857 zone melting Methods 0.000 claims description 9
- 239000013078 crystal Substances 0.000 abstract description 30
- 238000005516 engineering process Methods 0.000 abstract description 14
- 230000003068 static effect Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000009471 action Effects 0.000 abstract description 3
- 239000007769 metal material Substances 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract 1
- 230000008520 organization Effects 0.000 abstract 1
- 239000007787 solid Substances 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 238000010899 nucleation Methods 0.000 description 5
- 230000006911 nucleation Effects 0.000 description 5
- 229910052786 argon Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 229910001338 liquidmetal Inorganic materials 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 2
- 229910017150 AlTi Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000013332 literature search Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 230000005298 paramagnetic effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
Landscapes
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
Description
技术领域technical field
本发明涉及的是一种金属材料技术领域的方法，具体是一种在磁场中沿易轴取向的定向凝固方法。The invention relates to a method in the technical field of metal materials, in particular to a directional solidification method oriented along an easy axis in a magnetic field.
背景技术Background technique
磁晶各向异性是与温度的变化有关系，一般定义，在温度超过居里点以后，磁性材料的磁晶各向异性随磁性的消失而消失，而在近来的实际观测中，即使在远高于居里点的熔点附近，残余的磁晶各向异性仍是存在的。因此在磁场作用的熔体中，如果ΔE＝u0ΔxVHA 2/2＞kT得到满足，u0为真空磁导率，Δx＝x1-x为顺磁磁化率的各向异性，V是熔体中晶粒的体积，HA是磁场强度，k是波尔兹曼常量，T是绝对温度，ΔE代表磁晶各向异性能，kT代表热扰动因素，凝固过程中晶体的易轴取向可以获得。使用强的磁场，可在快的凝固速率下获得平行于磁场的沿易轴取向的多晶织构。Magnetocrystalline anisotropy is related to the change of temperature. It is generally defined that after the temperature exceeds the Curie point, the magnetocrystalline anisotropy of magnetic materials disappears with the disappearance of magnetism. In recent actual observations, even in the far Near the melting point above the Curie point, residual magnetocrystalline anisotropy still exists. Therefore, in the melt under the action of a magnetic field, if ΔE=u 0 ΔxVH A 2 /2>kT is satisfied, u 0 is the vacuum permeability, Δx=x 1-x is the anisotropy of the paramagnetic susceptibility, V is the volume of grains in the melt, H A is the magnetic field strength, k is the Boltzmann constant, T is the absolute temperature, ΔE represents the magnetocrystalline anisotropy energy, kT represents the thermal disturbance factor, and the easy axis of the crystal during solidification Orientation can be obtained. Using a strong magnetic field, a polycrystalline texture oriented along the easy axis parallel to the magnetic field can be obtained at a fast solidification rate.
经对现有技术的文献检索发现，B.A.Legrand等人在《Journal of Magnetismand Magnetic Materials》(磁性及磁性材料)，173(1997)20-28上发表有“Orientation by solidification in a magnetic field---A new process totexture SmCo compounds used as permanent magnets”(《在磁场中的凝固取向——一种新的钐钴永磁化合物的织构生长方法》。在实验中B.A.Legrand对凝固中的SmCo合金施加大于2.5特斯拉的静磁场，凝固在数秒钟内完成，获得了平行于磁场方向的沿易轴取向的织构。但这种沿易轴取向的织构控制新技术目前还主要针对普通凝固领域，尚未体现在定向凝固技术中。这是因为在普通凝固中，如果磁场强度足够大，在凝固的初始阶段，熔体中的形核晶粒将受到足够大的磁矩作用旋向易轴取向；而在定向凝固技术中，凝固的初始部分是一薄层激冷层，缺乏在普通凝固中能让形核晶粒自由取向的熔体空间，形核晶粒难以按磁场取向；而在初始凝固以后，形核晶粒通过原子扩散不断向熔体中延伸，界面能以及过冷等因素将决定最终的晶体取向，和这些因素相比，至少普通的强磁场(＜10特斯拉)对定向生长过程中晶体取向的影响是微弱的，因此在一般的定向凝固技术中，磁场难以对取向产生直接影响。Found through literature search to prior art, B.A.Legrand et al published "Orientation by solidification in a magnetic field--- A new process totexture SmCo compounds used as permanent magnets" ("Solidification orientation in a magnetic field - a new texture growth method of samarium cobalt permanent magnet compounds". In the experiment, B.A.Legrand applied more than With a static magnetic field of 2.5 Tesla, the solidification is completed within a few seconds, and a texture oriented along the easy axis parallel to the direction of the magnetic field is obtained. However, this new technology of texture control along the easy axis is still mainly aimed at the general solidification field , has not been reflected in the directional solidification technology. This is because in ordinary solidification, if the magnetic field strength is large enough, in the initial stage of solidification, the nucleation grains in the melt will be subjected to a large enough magnetic moment to rotate to the easy axis orientation ; while in the directional solidification technology, the initial part of solidification is a thin layer of chilled layer, which lacks the melt space that allows the nucleation grains to be oriented freely in ordinary solidification, and it is difficult for the nucleation grains to be oriented according to the magnetic field; while in the initial After solidification, nucleation grains continue to extend into the melt through atomic diffusion, and factors such as interface energy and supercooling will determine the final crystal orientation. The effect of crystal orientation in the directional growth process is weak, so in the general directional solidification technology, it is difficult for the magnetic field to have a direct impact on the orientation.
定向凝固技术和非定向凝固技术在晶体组织方面的主要区别在于定向凝固技术可以使晶体沿某一方向(以下称纵向)连续生长得到整个产品的单晶组织或胞晶组织等。定向凝固技术通过减少晶界使晶体沿某一方向有序堆垛可以使某一方向的物理或机械性能得以强化，在半导体、磁性、高温合金等材料的加工领域有着不可替代的价值。而沿易轴方向定向生长的材料往往能取得最佳的物理或机械性能，但某些材料如(TbDy)Fe2和AlTi等在普通的定向凝固技术中不能获得沿易轴方向的取向。The main difference between directional solidification technology and non-directional solidification technology in terms of crystal structure is that directional solidification technology can make the crystal grow continuously along a certain direction (hereinafter referred to as the longitudinal direction) to obtain the single crystal structure or cell crystal structure of the entire product. Directional solidification technology can strengthen the physical or mechanical properties of a certain direction by reducing the grain boundaries so that the crystals can be stacked in a certain direction. It has irreplaceable value in the processing of semiconductors, magnetism, superalloys and other materials. The materials oriented along the easy axis direction can often achieve the best physical or mechanical properties, but some materials such as (TbDy) Fe2 and AlTi cannot obtain orientation along the easy axis direction in common directional solidification technology.
发明内容Contents of the invention
本发明的目的在于针对现有技术的不足，提供一种在磁场中沿易轴取向的定向凝固方法。使其结合强磁场下普通凝固技术，在定向凝固初始阶段快速下拉一段，同时施加强磁场，获得沿磁化方向取向的籽晶，将磁场对凝固过程中取向的控制运用到定向凝固技术中以获得晶体生长沿易轴取向。The object of the present invention is to provide a directional solidification method in a magnetic field along the easy axis orientation to address the deficiencies of the prior art. Combine it with common solidification technology under strong magnetic field, quickly pull down a section in the initial stage of directional solidification, and apply a strong magnetic field at the same time to obtain seed crystals oriented along the magnetization direction, and apply the control of magnetic field orientation during solidification to directional solidification technology to obtain Crystal growth is oriented along the easy axis.
本发明通过以下技术方案实现的，具体步骤如下：The present invention is realized through the following technical solutions, and concrete steps are as follows:
(1)先加热产品至熔点以上，以保证杂相充分溶解，如使用的是区熔技术，区熔长度应大于3.5cm，以确保有一较长的完全熔化的熔体区域；(1) First heat the product above the melting point to ensure that the impurity phase is fully dissolved. If the zone melting technology is used, the zone melting length should be greater than 3.5cm to ensure a long completely melted melt zone;
(2)施加平行于定向凝固方向的轴向强磁场，磁场强度≥3特斯拉；(2) Apply an axial strong magnetic field parallel to the direction of directional solidification, with a magnetic field strength ≥ 3 Tesla;
(3)在上述磁场中，以大于3mm/s的速度下拉定向凝固件1.0-2cm；(3) In the above-mentioned magnetic field, pull down the directional solidification element by 1.0-2cm at a speed greater than 3mm/s;
(4)停止下拉，在熔体充分凝固后，可在凝固部分获得轴向的沿易轴取向的凝固组织；(4) Stop the pull-down, and after the melt is fully solidified, an axial solidified structure oriented along the easy axis can be obtained at the solidified part;
(5)然后在30k/cm-800k/cm的温度梯度(较低的温度梯度指Bridgeman法，较高的温度梯度指区熔法和区熔液态金属冷却法)以2-20μm/s的速率进行定向凝固。(5) Then at a temperature gradient of 30k/cm-800k/cm (lower temperature gradient refers to Bridgeman method, higher temperature gradient refers to zone melting method and zone melting liquid metal cooling method) at a rate of 2-20μm/s Perform directional solidification.
在定向凝固时磁场强度可以下降，强度保持在0.2-1.5特斯拉，这样的磁场强度足以抑制液固界面的温度波动和紊流，并能压缩液固界面的过冷区，有利于保持平的液固界面，使溶质原子有序向固相扩散，以实现晶体的有序生长。The magnetic field strength can be reduced during directional solidification, and the strength is maintained at 0.2-1.5 Tesla. Such a magnetic field strength is enough to suppress the temperature fluctuation and turbulence of the liquid-solid interface, and can compress the supercooled area of the liquid-solid interface, which is conducive to maintaining a flat surface. The liquid-solid interface enables the orderly diffusion of solute atoms to the solid phase, so as to realize the orderly growth of crystals.
本发明在定向凝固初始阶段快速下拉一段，同时施加强磁场，使形核晶粒在凝固过程中沿易轴取向，从而在定向凝固件的开始部位获得多晶的沿易轴取向的凝固组织；这沿易轴取向的端头可以起到籽晶的作用，然后在较低的磁场以适当的速率进行定向凝固，从而实现沿着籽晶的易轴取向生长。In the present invention, a section is quickly pulled down in the initial stage of directional solidification, and a strong magnetic field is applied at the same time, so that the nucleation crystal grains are oriented along the easy axis during the solidification process, thereby obtaining a polycrystalline solidification structure oriented along the easy axis at the beginning of the directional solidification; The tip oriented along the easy axis can act as a seed crystal, and then undergo directional solidification at an appropriate rate at a lower magnetic field, thereby achieving growth along the easy axis orientation of the seed crystal.
与现有技术相比，本发明有如下优越性：(1)在整个方法中，不用单独另外制备籽晶，各步骤连续完成。(2)可以有效地确保在多种定向凝固技术中晶体沿籽晶的易轴取向生长。由于磁场可以抑制温度波动和熔体紊流，并能压缩液固界面的过冷区，使凝固趋于平衡凝固，从而有助于晶体生长按籽晶的取向进行，这一点在籽晶的取向不是晶体的择优生长方向时更有意义。因为晶体生长有按择优生长方向生长的趋势。在没有施加静磁场的区熔法中，运用籽晶技术时，(TbDy)Fe2等不能获得籽晶的易轴取向而只能获得普通定向凝固的择优取向。(3)同样由于熔体的紊流被抑制，该方法的生产效率和成品率均要高于没有静磁场作用的运用籽晶的生产工艺。Compared with the prior art, the present invention has the following advantages: (1) In the whole method, there is no need to prepare additional seed crystals separately, and each step is completed continuously. (2) It can effectively ensure that the crystal grows along the easy axis orientation of the seed crystal in various directional solidification techniques. Since the magnetic field can suppress temperature fluctuations and melt turbulence, and can compress the supercooled area of the liquid-solid interface, the solidification tends to be balanced and solidifies, which helps the crystal growth to proceed according to the orientation of the seed crystal, which is in the orientation of the seed crystal It is more meaningful when it is not the preferred growth direction of the crystal. Because crystal growth tends to grow in the preferred growth direction. In the zone melting method without applying a static magnetic field, when the seed crystal technology is used, (TbDy)Fe 2 , etc. cannot obtain the easy axis orientation of the seed crystal, but can only obtain the preferred orientation of ordinary directional solidification. (3) Also because the turbulent flow of the melt is suppressed, the production efficiency and yield of this method are higher than those of the production process using the seed crystal without the action of the static magnetic field.
具体实施方式Detailed ways
结合本发明的内容提供具体实施例：Provide specific embodiment in conjunction with content of the present invention:
实施例1：Example 1:
在Bridgeman定向凝固装置附加一轴向的超导磁场。定向凝固的液固界面控制在磁场的中心区域。定向凝固方向和磁场方向平行，将预先制备的多晶Tb0.3Dy0.7Fe1.95棒材安装好。然后抽真空至＜5×10-2Pa，充氩气至0.1MPa。An axial superconducting magnetic field is added to the Bridgeman directional solidification device. The liquid-solid interface of directional solidification is controlled in the central area of the magnetic field. The directional solidification direction is parallel to the direction of the magnetic field, and the pre-prepared polycrystalline Tb 0.3 Dy 0.7 Fe 1.95 rod is installed. Then evacuate to <5×10 -2 Pa, and fill with argon to 0.1MPa.
然后按如下步骤实施：Then implement as follows:
(1)将Tb0.3Dy0.7Fe1.95棒材加热溶化。固液界面的温度梯度保持在30℃/cm(在施加磁场以后，实际的温度梯度会将会增加25-50％)。(1) Heat and melt the Tb 0.3 Dy 0.7 Fe 1.95 rod. The temperature gradient at the solid-liquid interface was maintained at 30°C/cm (after applying the magnetic field, the actual temperature gradient would increase by 25-50%).
(2)将棒材加热后，启动超导静磁场，磁场强度为4T。(2) After the bar is heated, start the superconducting static magnetic field, and the magnetic field strength is 4T.
(3)以5mm/s的速度凝固1.5cm，然后停止移动或下拉，静置约20秒，使定向凝固件端头凝固。(3) Solidify 1.5cm at a speed of 5mm/s, then stop moving or pull down, and stand for about 20 seconds to solidify the end of the directional solidification element.
(4)然后将磁场强度缓慢调降至200mT。(4) Then slowly reduce the magnetic field strength to 200mT.
(5)再继续进行定向凝固，定向凝固下拉速度为2μm/s，直至整个棒材定向凝固结束。(5) Continue to carry out directional solidification, and the directional solidification pull-down speed is 2 μm/s until the directional solidification of the entire rod ends.
实施例2：Example 2:
在区熔定向凝固装置附加一轴向的超导磁场。区熔长度为4cm，定向凝固的液固界面控制在磁场的中心区域。定向凝固方向和磁场方向平行，将预先制备的多晶Tb0.3Dy0.7Fe1.95棒材安装好。然后抽真空至＜5×10-2Pa，充氩气至0.1MPa。An axial superconducting magnetic field is added to the melting and directional solidification device in the zone. The zone melting length is 4cm, and the liquid-solid interface of directional solidification is controlled in the central area of the magnetic field. The directional solidification direction is parallel to the direction of the magnetic field, and the pre-prepared polycrystalline Tb 0.3 Dy 0.7 Fe 1.95 rod is installed. Then evacuate to <5×10 -2 Pa, and fill with argon to 0.1MPa.
然后按如下步骤实施：Then implement as follows:
(1)将Tb0.3Dy0.7Fe1.95棒材加热溶化。固液界面的温度梯度保持在250℃/cm(在施加磁场以后，实际的温度梯度会将会增加25-50％)。(1) Heat and melt the Tb 0.3 Dy 0.7 Fe 1.95 rod. The temperature gradient at the solid-liquid interface is maintained at 250°C/cm (after applying the magnetic field, the actual temperature gradient will increase by 25-50%).
(2)将棒材加热后，启动超导静磁场，磁场强度为4T。(2) After the bar is heated, start the superconducting static magnetic field, and the magnetic field strength is 4T.
(3)以5mm/s的速度凝固2cm，然后停止移动，静置约20秒，使定向凝固件端头凝固。(3) Solidify 2cm at a speed of 5mm/s, then stop moving, and stand for about 20 seconds to solidify the end of the directional solidification element.
(4)然后将磁场强度缓慢调降至800mT。(4) Then slowly reduce the magnetic field strength to 800mT.
(5)再继续进行定向凝固，定向凝固速度为10μm/s，直至整个棒材定向凝固结束。(5) Continue to carry out directional solidification, the directional solidification speed is 10 μm/s, until the directional solidification of the whole rod ends.
实施例3：Example 3:
在液态金属冷却区熔定向凝固装置附加一轴向的超导磁场。区熔长度为4cm，定向凝固的液国界面控制在磁场的中心区域。定向凝固方向和磁场方向平行，将预先制备的多晶Tb0.3Dy0.7Fe1.95棒材安装好。然后抽真空至＜5×10-2Pa，充氩气至0.1MPa。An axial superconducting magnetic field is added to the melting and directional solidification device in the liquid metal cooling zone. The zone melting length is 4cm, and the liquid-state interface of directional solidification is controlled in the central area of the magnetic field. The directional solidification direction is parallel to the direction of the magnetic field, and the pre-prepared polycrystalline Tb 0.3 Dy 0.7 Fe 1.95 rod is installed. Then evacuate to <5×10 -2 Pa, and fill with argon to 0.1MPa.
然后按如下步骤实施：Then implement as follows:
(1)将Tb0.3Dy0.7Fe1.95棒材加热溶化。固液界面的温度梯度保持在800℃/cm(在施加磁场以后，实际的温度梯度会将会增加25-50％)。(1) Heat and melt the Tb 0.3 Dy 0.7 Fe 1.95 rod. The temperature gradient at the solid-liquid interface is maintained at 800°C/cm (after applying the magnetic field, the actual temperature gradient will increase by 25-50%).
(2)将棒材加热后，启动超导静磁场，磁场强度为4T。(2) After the bar is heated, start the superconducting static magnetic field, and the magnetic field strength is 4T.
(3)以5mm/s的下拉速度快速下拉1.0cm，然后停止下拉，静置约20秒，使定向凝固件端头凝固。(3) Quickly pull down 1.0 cm at a pull-down speed of 5 mm/s, then stop the pull-down, and let stand for about 20 seconds to solidify the end of the directional solidification element.
(4)然后将磁场强度缓慢调降至1.5T。(4) Then slowly reduce the magnetic field strength to 1.5T.
(5)再继续进行定向凝固，定向凝固下拉速度为20μm/s，直至整个棒材定向凝固结束。(5) Continue to carry out directional solidification, and the directional solidification pull-down speed is 20 μm/s until the directional solidification of the entire bar is completed.
实施例1-3中均可获得整个棒材轴向为[111]取向的Tb0.3Dy0.7Fe2定向生长的棒材，除端头籽晶部位，整个棒材为连续生长的柱晶组织，具有优异的磁致伸缩性能和磁性能。其中实施例1中，在定向凝固中需要的磁场强度最低，但生产效率也低，在实施例3中，在定向凝固中需要的磁场强度较高(因为温度梯度高，液固界面熔体对流较强烈，需要较强的磁场强度抑制)，但效率也较高。In Examples 1-3, the whole bar can be obtained with [111] orientation in the axial direction of the Tb 0.3 Dy 0.7 Fe 2 oriented growth bar. Except for the seed crystal part at the end, the whole bar is a continuously growing columnar structure. Has excellent magnetostrictive properties and magnetic properties. Wherein in embodiment 1, the magnetic field intensity required in directional solidification is the lowest, but production efficiency is also low, and in embodiment 3, the magnetic field intensity required in directional solidification is higher (because temperature gradient is high, liquid-solid interface melt convection Stronger, requiring a stronger magnetic field strength to suppress), but the efficiency is also higher.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100293041A CN1321219C (en) | 2005-09-01 | 2005-09-01 | Axially oriented directional solidification process in magnetic field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100293041A CN1321219C (en) | 2005-09-01 | 2005-09-01 | Axially oriented directional solidification process in magnetic field |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1740370A CN1740370A (en) | 2006-03-01 |
| CN1321219C true CN1321219C (en) | 2007-06-13 |
Family
ID=36092903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100293041A Expired - Fee Related CN1321219C (en) | 2005-09-01 | 2005-09-01 | Axially oriented directional solidification process in magnetic field |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1321219C (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101308718B (en) * | 2007-05-18 | 2011-07-20 | 北京有色金属研究总院 | Rare earth - iron super magnetostriction material |
| CN101966576A (en) * | 2010-09-10 | 2011-02-09 | 中国科学院宁波材料技术与工程研究所 | Directional solidifying crystallization method of metal alloy magnet and device for implementing same |
| CN102021643B (en) * | 2010-09-21 | 2012-08-15 | 上海大学 | Method and device for directionally solidifying liquid-solid interface based on alternating magnetic field modulation |
| CN102059337A (en) * | 2010-11-23 | 2011-05-18 | 宁波市磁正稀土材料科技有限公司 | Method for controlling orientation of TbxDy (1-x) Fe (1.75-1.95) alloy along easy magnetic axis by being solidified in magnetic field |
| CN102071469B (en) * | 2011-01-13 | 2013-02-06 | 西北工业大学 | A directional solidification device with a traveling wave magnetic field generator |
| CN103008624B (en) * | 2012-12-28 | 2014-05-21 | 哈尔滨工业大学 | Continuous Cold Crucible Directional Solidification Casting Method |
| CN103056347A (en) * | 2013-01-09 | 2013-04-24 | 上海大学 | Method for controlling dendritic crystal orientation of oriented solidification structure by high-intensity magnetic field |
| CN103233272A (en) * | 2013-05-08 | 2013-08-07 | 上海大学 | Method for phase separation of original ecological microcrystals in Bi-Mn alloy by using stereospecific polymerization |
| CN104862777B (en) * | 2015-05-19 | 2018-03-02 | 上海大学 | The method and device of directional solidification control crystal orientation under steady magnetic field |
| CN105964990B (en) * | 2016-05-26 | 2018-04-27 | 西北工业大学 | A kind of directional freeze method of externally-applied magnetic field control freckle defect |
| CN107159896B (en) * | 2017-04-17 | 2019-04-02 | 上海交通大学 | The method for preparing single crystal blade based on the double induced orientation recrystallizations in extra-fine nickel powder region |
| CN115584385A (en) * | 2022-09-09 | 2023-01-10 | 上海大学 | Method for regulating and controlling directional arrangement of gray cast iron solidification structure by magnetic field |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1406688A (en) * | 2001-09-11 | 2003-04-02 | 上海大学 | Method for controlling granularity of metal solidification |
-
2005
- 2005-09-01 CN CNB2005100293041A patent/CN1321219C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1406688A (en) * | 2001-09-11 | 2003-04-02 | 上海大学 | Method for controlling granularity of metal solidification |
Non-Patent Citations (3)
| Title |
|---|
| "直流磁场对Al-Cu合金定向凝固组织的影响" 时海芳，顾春雷，刘晴，有色金属，第55卷第1期 2003;"强脉冲磁场中Al-Cu共晶定向凝固组织的演变" 赵志龙，张蓉，刘林，曾安培，材料研究学报，第19卷第2期 2005 * |
| "强脉冲磁场中Al-Cu共晶定向凝固组织的演变" 赵志龙，张蓉，刘林，曾安培，材料研究学报，第19卷第2期 2005 * |
| "直流磁场对Al-Cu合金定向凝固组织的影响" 时海芳，顾春雷，刘晴，有色金属，第55卷第1期 2003 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1740370A (en) | 2006-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1321219C (en) | Axially oriented directional solidification process in magnetic field | |
| JP6293803B2 (en) | Magnetic phase transformation material, method for producing magnetic phase transformation material and use of magnetic phase transformation material | |
| CN103056347A (en) | Method for controlling dendritic crystal orientation of oriented solidification structure by high-intensity magnetic field | |
| Huang et al. | Banded-like morphology and martensitic transformation of dual-phase Ni–Mn–In magnetic shape memory alloy with enhanced ductility | |
| CN101826385A (en) | Magnetic material with exchange bias effect and preparation method thereof | |
| CN101260494B (en) | A Ge-doped FeCo-based dual-phase soft magnetic alloy | |
| Wu et al. | Crystal growth and magnetic property of YFeO 3 crystal | |
| Meng et al. | Magnetostriction of a Fe83Ga17 single crystal slightly doped with Tb | |
| CN102732762A (en) | Magnetic shape memory alloy material with great exchange bias effect and preparation method thereof | |
| Dong et al. | Enhanced magnetostriction of Tb–Dy–Fe via simultaneous⟨ 111⟩-crystallographic orientation and-morphological alignment induced by directional solidification in high magnetic fields | |
| CN104862777B (en) | The method and device of directional solidification control crystal orientation under steady magnetic field | |
| Gabay et al. | MnBi-based magnets prepared from melt-spun alloys: effect of α→ β phase transformation during field annealing | |
| CN108611542A (en) | A kind of preparation method of block Fe-B directional nano soft magnetic materials | |
| Liu et al. | Effect of an axial high static magnetic field on the crystal orientation and magnetic property of Fe-4.5 wt% Si alloy during bulk solidification | |
| CN102423800B (en) | Crystal oriented growth control method of magnetic material in low-temperature gradient | |
| Tu et al. | Enhancement of magnetostrictive performance of Tb0. 27Dy0. 73Fe1. 95 by solidification in high magnetic field gradient | |
| Liu et al. | Magnetic-field-dependent microstructure evolution and magnetic properties of Tb0. 27Dy0. 73Fe1. 95 alloy during solidification | |
| CN1254334C (en) | Texture controlling method of high temperature molten crystal growth axially | |
| Ji et al. | Preparation of Terfenol-D with precise< 110> orientation and observation of the oriented growth crystal morphology | |
| Guo et al. | < 111>-orientation growth of Tb-Dy-Fe alloys induced by high magnetic fields during directional solidification | |
| Xiaoqian et al. | Influence of zirconium addition on microstructure, magnetic properties and thermal stability of nanocrystalline Nd12. 3Fe81. 7B6. 0 alloy | |
| US20140251506A1 (en) | Iron-based composition for magnetocaloric effect (mce) applications and method of making a single crystal | |
| CN109371473A (en) | A Mechano-thermal Coupling Method for Eliminating Twins in NiMnGa Single Crystals | |
| CN1753113B (en) | Method of magnetic material solidification orientation in magnetic field based on critical condition | |
| Deng et al. | Study on the melt-textured technique in a magnetic field for giant magnetostrictive materials R–Fe alloy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070613 Termination date: 20100901 |