Martensitic Transformations of Ni54Mn25Ga21-xAlx Shape Memory Alloys
Martensitic Transformations of Ni54Mn25Ga21-xAlx Shape Memory Alloys
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DOI：
10.4028/www.scientific.net/msf.475-479.1991
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发表时间：
2005-01
期刊：
影响因子：
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通讯作者：
Y. Xin;Yan Li;Chengbao Jiang;Huibin Xu
中科院分区：
文献类型：
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作者：
Y. Xin;Yan Li;Chengbao Jiang;Huibin Xu
高Ni含量的非化学计量比NiMnGa形状记忆合金是一种很有前途的高温热驱动材料。对Ni54Mn25Ga21合金中的Al替代Ga进行了研究。用差示扫描量热仪(DSC)和X射线衍射仪(XRD)研究了Ni54Mn25Ga21-xAlx形状记忆合金的相变和显微组织。结果表明，随着Al替代Ga含量的增加，马氏体相变温度几乎呈线性下降，这可以考虑尺寸因素，即晶格参数的影响。在Al取代Ga的过程中，发现了从非调制四方结构到七层14M结构的转变。
The non-stoichiometric NiMnGa shape memory alloy with high Ni content has been developed as promising thermo-actuated materials applied at high temperature. A substitution of Al for Ga in the Ni54Mn25Ga21 alloys is performed. Differential scanning calorimetry (DSC) and X-ray diffraction (XRD) measurements have been carried out to study the effects of the phase transformations and microstructures of the Ni54Mn25Ga21-xAlx shape memory alloys. The results show that the martensitic transformation temperatures almost linearly decrease with the increase of Al substitution for Ga, which can be explained considering the effect of the size factor, i.e. the lattice parameter. A structural transition from a non-modulated tetragonal type to a seven-layered 14M one has been found during the increase of Al substitution for Ga.