γ-MnFe合金内耗的振幅效应  

Amplitude Effect of Internal Friction in γ-MnFe Alloys

作　　者：顾苏怡[1] 张骥华[2] 

机构地区：[1]苏州市职业大学机电工程系,江苏苏州215104 [2]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》2010年第5期631-634,共4页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(50571065)

摘　　要：采用低频内耗仪研究原子分数分别为86.4%Mn和80.8%Mn的γ-MnFe合金在相变过程中内耗和模量的变化情况。结果表明,从高温到低温,γ-MnFe合金经历了反铁磁转变和马氏体相变,依次出现了反铁磁转变、马氏体相变和孪晶3个内耗峰,且均出现了振幅效应。这是由于反铁磁转变和马氏体相变所产生孪晶的结果。An investigation was made regarding the variation in internal friction and modulus with 86.4%Mn and 80.8%Mn γ-MnFe alloys.The results indicate that γ-MnFe alloys undergo paramagnetic to antiferromagnetic transition and martensitic transformation while cooling from high temperature.There are three internal friction peaks during this process and they all have amplitude effect.It confirms that the twins caused by anteferromagnetic transition and martensitic transformation are the physical nature of high damping capacity of γ-MnFe alloys.

关 键 词：γ-MnFe合金 高阻尼孪晶 非线性内耗 

分 类 号：TG113.22[金属学及工艺—物理冶金]