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采用定向凝固技术制备多晶合金 ,使合金获得择优取向 ,并研究这种择优取向对磁感生应变的影响 .研究结果表明 ,多晶Ni Mn Ga RE(RE =Tb ,Sm)合金定向凝固生长以后 ,在一定晶体学方向上发生择优取向 ,可以显著提高合金的磁感生应变值 .在同等大小的磁场下 ,定向凝固试样的磁感生应变值比铸态试样的应变值高出很多 ,特别是在高磁场下 (>0 5T) ,定向凝固试样的磁感生应变值约为相同成分的铸态试样的 2倍 .所以 ,定向凝固工艺是制备具有择优取向晶体并获得大磁感生应变的一种有效方法 .
The polycrystalline alloys were prepared by directional solidification technique, the preferred orientation of the alloys was obtained, and the influence of the preferred orientation on the magnetic induction strain was investigated. The results show that the directional solidification growth of polycrystalline Ni Mn Ga RE (RE = Tb, Sm) In the future, the preferred orientation occurs in a certain crystallographic direction, which can significantly increase the magnetic induction strain of the alloy.Under the same magnetic field, the magnetic induction strain of the directional solidification specimen is higher than that of the as-cast specimen Many, especially in high magnetic field (> 0 5T), the direction of the solidified sample of the magnetic induction strain value is about the same composition of the as-cast sample twice .Therefore, the directional solidification process is prepared with the preferred orientation and obtained An Effective Method for Inducing Magnetism in Magnetism.