γ-MnFe合金反铁磁转变和马氏体相变  

Antiferromagnetic Transition and Mrtensitic Transformation of γ-Mn-Fe Alloys

作　　者：顾苏怡[1] 张骥华[1] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200030

出　　处：《上海交通大学学报》2006年第10期1711-1714,1718,共5页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(50571065)

摘　　要：利用低频内耗仪强迫振动方法测量-50～250℃,61.4%～86.4% Mnγ-MnFe合金降温过程的内耗和模量性质.实验结果显示,从高温到低温内耗表现有3个峰;第1个峰在磁转变温度附近;第2个峰出现在马氏体相变温度附近;第3个峰出现在0℃以下.分析表明,第1个峰与应力下磁畴移动有关;第2个峰是fcc及fct相界面运动引起的;第3个峰与{101}孪晶界的驰豫过程有关.在不同的温度和成分范围内讨论了两个相变的耦合作用.An investigation was made regarding the variation in internal friction and Young's modulus with 61.4%～86.4% Mnγ-MnFe alloys within-50～250℃ by means of force vibration.From higher temperature to the lower,the internal friction is found to exhibit these peaks.The first is on the vicinity of the temperature of magnetic transformation,the second peak is observed at the temperature of the martensitic transformation.And the third appears at the temperature below 0℃.It was the analysis shows that the first peak may be connected with the motion of magnetic domain under strain.The second peak is suggested to be connected with the movement of interfaces separating the fcc and fct phase.And the last one is due to a relaxation process associated with the movement of the {101}-twin boundaries in the fct phase or fcc antiferromagnetic phase.The coupling effect of the two transformations was discussed in different temperature and composition range.

关 键 词：高阻尼 孪晶峰 模量软化 相变耦合 

分 类 号：TG113.226[金属学及工艺—物理冶金]