Experiment and theoretical prediction of martensitic transformation crystallography in a Ni–Mn–Ga ferromagnetic shape memory alloy
Experiment and theoretical prediction of martensitic transformation crystallography in a Ni–Mn–Ga ferromagnetic shape memory alloy
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DOI：
10.1016/j.actamat.2007.04.045
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发表时间：
2007-08
期刊：
影响因子：
9.4
通讯作者：
D. Cong;Yudong Zhang;Yandong Wang;M. Humbert;Xiang Zhao;Tadao Watanabe;L. Zuo;C. Esling
中科院分区：
文献类型：
--
作者：
D. Cong;Yudong Zhang;Yandong Wang;M. Humbert;Xiang Zhao;Tadao Watanabe;L. Zuo;C. Esling
采用实验观察和理论计算相结合的方法，对Ni53Mn25Ga22铁磁形状记忆合金的马氏体相变结晶学和显微组织特征进行了详细的研究。结果表明，在每个初始奥氏体晶中存在两个显微上与孪晶有关的马氏体异构体，它们在∼110〈极大值附近错位取向为〉82°。确定孪晶界面为{0.3990.3830.833}M(与{112}M相距1.79°)。同一奥氏体晶内遗传的两种变异体的数量之比约为1.70。奥氏体和马氏体之间的普遍取向关系是Kurdjuov-Sachs(K-S)与(111)A//(101)M，[11‘0]A//[111]M的关系。成功地解释了马氏体相变过程中的结晶学特征，将为发展具有最佳性能的FSMA提供依据。
A detailed study of martensitic transformation crystallography and microstructural characteristics in the Ni53Mn25Ga22ferromagnetic shape memory alloy (FSMA) was performed by both experimental observation and theoretical calculation. It is revealed that there are two microscopically twin-related martensitic variants with a misorientation of ∼82° around the 〈110〉Maxis in each initial austenite grain. The twin interface plane was determined to be {0.3990.3830.833}M(1.79° away from {112}M). The ratio of the amounts of the two variants inherited from one single austenite grain is about 1.70. The prevalent orientation relationship between austenite and martensite was found to be Kurdjumov–Sachs (K–S) relationship with (111)A//(101)M, [11¯0]A//[111¯]M. A successful explanation of the crystallographic features during martensitic transformation will shed light on the development of FSMAs with optimal performance.