罗丰华,陈嘉砚,及川胜成,石田清仁

• 1:中南大学粉末冶金国家重点实验室
• 2:钢铁研究总院结构材料研究所
• 3:日本东北大学工学研究科材料科学系
• 4:日本东北大学工学研究科材料科学系 湖南长沙410083

摘要(Abstract)：

传统的β基Ni-Al-Fe形状记忆合金随Fe含量提高而呈铁磁性,因此可以发展为铁磁性形状记忆合金。通过金相显微分析、DSC、VSM和EDX方法,研究了Co含量x对Ni54Al25Fe21-xCox合金马氏体相变和磁性的影响。发现该合金马氏体相变温度与x成正比关系,x每增加1at%,1623K淬火时马氏体相变温度约提高30K,1373K淬火时马氏体相变温度约提高38K。淬火温度降低会显著降低Ni54Al25Fe21-xCox合金的马氏体相变温度和Curie点Tc,但随着x的提高,淬火温度对马氏体相变温度和Tc的影响程度减小。Tc随x变化的幅度不大,在Tc-x曲线上出现最大值,为256K,对应于1623K淬火的Ni54Al25Fe19Co2合金。马氏体相变温度的变化与β相的平均s+d总电子浓度变化有关,并首次提出Al含量和结构有序度两方面的变化共同影响Curie点。

关键词(KeyWords)： Ni-Fe-Al-Co合金;马氏体相变;Curie点

Abstract:

Keywords:

基金项目(Foundation): 教育部留学回国人员科研启动基金资助项目

作者(Author): 罗丰华,陈嘉砚,及川胜成,石田清仁

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