Ni56Mn25-xCrxGa19 (x=0, 2, 4, 6) high temperature shape memory alloys
Ni56Mn25-xCrxGa19 (x=0, 2, 4, 6) high temperature shape memory alloys
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DOI：
10.1016/s1003-6326(11)60683-3
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发表时间：
2011-01-01
影响因子：
4.5
通讯作者：
Liu Xing-jun
中科院分区：
文献类型：
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作者：
Ma Yun-qing;Lai San-li;Liu Xing-jun
研究了Ni56Mn25-xCrxGa19 （x= 0,2,4,6）合金的显微组织、马氏体相变行为、力学性能和形状记忆性能。x=0时为单相马氏体，呈四方相结构，x >= 2时为双相马氏体和γ相。马氏体相变峰温度从x=0时的401℃单调降低到x=6时的197℃。结果表明，通过添加Cr引入γ相可以有效地改善合金的可加工性和塑性。x=4时拉伸应力为497mpa，应变为8%；x=6时拉伸应力为454mpa，应变为5.5%。当x=4残余应变为4.5%时，形状记忆应变值为2.7%；当x=6残余应变为3.5%时，形状记忆应变值为1.9%。
The microstructure, martensitic transformation behavior, mechanical and shape memory properties of Ni56Mn25-xCrxGa19 (x=0, 2, 4, 6) alloys were investigated. Single phase of martensite with tetragonal structure is present for x=0, and dual-phase containing martensite and gamma phase is observed for x >= 2. The martensitic transformation peak temperatures decrease monotonically from 401 degrees C for x=0 to 197 degrees C for x=6. The introduction of gamma phase by Cr addition is proved to be effective in improving the workability and ductility. The tensile stress and strain are 497 MPa and 8 % for x=4, and 454 MPa and 5.5 % for x=6, respectively. The shape memory strain values are 2.7 % under a residual strain of 4.5 % for x=4, and 1.9 % under a residual strain of 3.5 % for x=6, respectively.