Simultaneous improvement of ductility and shape memory effect of two-phase Ni53Mn22Co6Ga19 high-temperature shape memory alloy with the addition of Ta
Simultaneous improvement of ductility and shape memory effect of two-phase Ni53Mn22Co6Ga19 high-temperature shape memory alloy with the addition of Ta
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DOI：
10.1016/j.matlet.2012.01.103
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发表时间：
2012-05
影响因子：
3
通讯作者：
Shuiyuan Yang;Cuiping Wang;Xingjun Liu
中科院分区：
文献类型：
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作者：
Shuiyuan Yang;Cuiping Wang;Xingjun Liu
为了进一步改善Ni53Mn22Co6Ga19高温形状记忆合金的塑性和形状记忆效应，本研究在两相Ni53Mn22Co6Ga19高温形状记忆合金中加入了少量的Ta来细化晶粒。结果表明，少量Ta的加入有利于细化晶粒尺寸。这一变化同时提高了合金的拉伸塑性和形状记忆效应，当Ta=0.2at.%时，分别达到11%和3.3%。当Ta的加入量进一步增加到0.4at.%时，合金中存在有序的γ‘相，并倾向于包裹γ相，偏析马氏体和γ相，导致Ta=0.4at.%时合金的塑性下降。所得结果可为改善其他类型的两相形状记忆合金的塑性和形状记忆效应提供有用的信息。
In this study, small Ta was added into two-phase Ni53Mn22Co6Ga19high-temperature shape memory alloy to refine grain for further improving the ductility and shape memory effect of the alloy. It is found that small Ta addition results in the refinement of grain size. This change simultaneously improve the tensile ductility and shape memory effect of the alloy, being up to 11% and 3.3% at Ta=0.2at.%, respectively. With further increasing Ta addition to 0.4at.%, the ordered γ′phase is present, and it tends to wrap γ phase and segregates martensite and γ phase, which lead to a decrease in the ductility of the alloy at Ta=0.4at.%. The obtained results may provide useful information on improving the ductility and shape memory effect for some other type of two-phase shape memory alloys.