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采用动力学分析 (DMA)和透射电子显微分析 (TEM )等实验方法 ,研究了含锰 45 .9%～ 86 .4% (原子分数 )范围Mn Fe (Cu)合金的反铁磁转变、马氏体相变及高阻尼特性。当锰含量超过 71% (原子分数 )时合金在变温过程中发生顺磁 反铁磁转变引起模量的剧烈变化。在尼尔点 (TN)以下的反铁磁状态～ 2 0 0℃温区内出现一个 10 -1数量级内耗的高阻尼区。随着含锰量的增加该区内逐渐显示出两个分立的内耗峰。确定了其中高温端的内耗峰为马氏体相变的贡献而低温端的内耗峰则纯属孪晶界的弛豫型内耗。文中测定了弛豫过程的激活能 ,讨论了合金呈现高阻尼与两种相变的关系
The antiferromagnetic transition of MnFe (Cu) alloy with Mn ranging from 45.9% to 86.4% (atomic fraction) was studied by means of dynamic analysis (DMA) and transmission electron microscopy (TEM) Martensitic transformation and high damping properties. When the Mn content exceeds 71% (atomic fraction), the paramagnetic antiferromagnetic transition occurs during the temperature change of the alloy and causes the dramatic change of the modulus. In the antiferromagnetic state ~ 200 ℃ below the Nielt point (TN), a high damping region with an internal friction loss of 10 -1 appears. With the increase of manganese content, the area gradually shows two separate internal friction peaks. The internal friction peak at high temperature was determined to be the contribution of the martensitic transformation while the internal friction peak at the low temperature end was purely the relaxation type internal friction of the twin boundary. In the paper, the activation energy of the relaxation process is measured, and the relationship between the high damping of the alloy and the two phase transitions is discussed