β基Ni52Ga28Fe20-xCox合金的马氏体相变和磁性转变

稀有金属材料与工程, 2006, 35(5): 740-745.

β基Ni52Ga28Fe20-xCox合金的马氏体相变和磁性转变

罗丰华 ^1, , 及川胜成 ^2, , 陈嘉砚 ^3, , 石田清仁 ^4,

1.中南大学,粉末冶金国家重点实验室,湖南,长沙,410083

2.日本东北大学工学部材料科学系,日本,仙台,980-8579

3.钢铁研究总院,北京,100081

4.日本东北大学工学部材料科学系,日本,仙台,980-8579

基金项目: 国家留学回国人员科研项目

关键词：铁磁性记忆合金 , Ni-Ga-Fe-Co合金 , 马氏体

Martensitic Phase Transformation and Magnetic Transition ofβBased Ni52Ga28Fe20-xCox Alloy

利用金相和SEM,XRD,DSC和VSM研究了Co含量x对Ni52Ga28Fe20-xCox合金马氏体相变和铁磁性的影响.结果表明:x≤6%时(原子分数,下同),Co代替Fe显著提高合金的马氏体相变温度,每1%Co可以使马氏体相变温度提高50 K～60 K,但对Curie点的影响不大.淬火温度从1423 K降低到773 K对马氏体相变温度的影响不大,但使Curie点提高20 K～30 K,其原因是母相的B2→L21转变导致的有序化程度提高.粉末试样X射线衍射发现1423 K和773 K 2种温度处理后都只出现L10(2M)晶体结构类型的马氏体,并且合金粉末化后降低了马氏体相变温度和增加了γ相的析出,但块状Ni52Ga28Fe17Co3合金773 K淬火后为14M型马氏体.

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β基Ni52Ga28Fe20-xCox合金的马氏体相变和磁性转变

Martensitic Phase Transformation and Magnetic Transition ofβBased Ni52Ga28Fe20-xCox Alloy

参考文献