采用定向凝固区熔法制备了铁磁形状记忆合金 Ni53Mn23.5Ga23.5, Ni54Mn23Ga23和 Ni50Mn27Ga23晶体. 用线切割切取5 mm×5 mm×6 mm 的长方体单晶, X射线极图法测定单晶体的生长方向与[100]方向相差小于 5 circ. 沿单晶试样的3个边分别进行压缩实验, 研究马氏体孪晶再 取向应力应变行为. 结果表明, 沿单晶生长方向为孪晶再取向最有利方向, 孪晶再取向应力最小, 仅为3---7 MPa. 压缩能有效地提高马氏体变体的 有序化和择优化, 形成近单变体状态.
Ferromagnetic shape memory alloys Ni53Mn23.5Ga23.5, Ni54Mn23Ga23 and Ni50Mn27-Ga23 single crystals were prepared by zone-melting unidirectional solidification. The orientations of the cut single crystals were determined by X-ray diffraction method. The Ni-Mn-Ga crystal growth direction is along [100] with the deviation less than 5 circ. The martensitic twins reorientation process was detected by the stress-strain curves. The compression experiments along different directions were performed, respectively. The results show that the compression improves the texture of favorable martensitic variants and turns them into a single martensitic variant by martensite reorientation.
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