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OALib Journal期刊
ISSN: 2333-9721
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铁磁形状记忆合金Ni-Mn-Ga单晶的马氏体孪晶再取向应力应变行为
, PP. 1290-1294
Keywords: 形状记忆合金,Ni-Mn-Ga,马氏体孪晶
Abstract:
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5mm×5mm×6mm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5circ.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---7MPa.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.
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