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以新一代溶液模型考察了合金元素对Fe-Mn-Si基合金层错能的影响,并预测了Fe-Mn-Si合金面心立方(fcc)→密排六方(hcp)马氏体的相变温度.应用规则溶液模型计算了含Ce和Y的ZrO2基陶瓷四方(t)→单斜(m)马氏体相变的自由能,结合测得ZrO2基陶瓷的强度,预测了马氏体相变的开始温度.对Ni-Mn-Ga磁驱动记忆合金的磁性转变温度TC、体心立方至体心正方(bcc→bct)马氏体相变温度Tmart和饱和磁化强度MS与成分的关系进行了优化,提出了具有较佳综合性能的成分范围.应用热力学方法对Fe-Mn-Si基合金、ZrO2基陶瓷和Ni-Mn-Ga铁磁合金等形状记忆材料作出的成分设计均与实验结果符合较好.
The effects of alloying elements on the layering of Fe-Mn-Si-based alloys were investigated with a new generation of solution model. The phase transformations of fcc → hexagonal martensite phases in Fe-Mn-Si alloys were also investigated. The temperature dependence of the martensitic transformation of tetragonal (t) → monoclinic (m) martensites of ZrO2-based ceramics containing Ce and Y was calculated using the regular solution model. Combined with the measured ZrO2-based martensitic strength, the martensite The onset temperature of phase transformation. The relationship between the magnetic transition temperature (TC), the martensite transformation temperature (Tmart) and the saturation magnetization (MS) of the Ni-Mn-Ga magnetic memory alloy And the composition range of the composite material with better comprehensive properties is put forward.The compositional design of the shape memory materials such as Fe-Mn-Si-based alloy, ZrO2-based ceramic and Ni-Mn-Ga ferromagnetic alloy by thermodynamic method are all consistent with the experimental The result is in good agreement.