γMn基合金反铁磁畸变与高阻尼孪晶的形成  

Antiferromagnetic Distortion and Formation of High Damping Twins in γMn-Based Alloys

作　　者：邓华铭[1] 钟志源[2] 张骥华[1] 陈树川[1] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200030 [2]香港城市大学物理和材料科学系

出　　处：《上海交通大学学报》2002年第1期28-31,共4页Journal of Shanghai Jiaotong University

摘　　要：根据反铁磁序引起的点阵畸变与磁长程序参量之间的关系 ,计算了 γMn- Cu合金顺磁→反铁磁转变引起的点阵畸变 ,并将计算值与实验数据进行了比较 .通过 γMn- Fe基合金高阻尼特性测定 ,验证了反铁磁序与孪晶高阻尼的关系在其他锰基合金中同样存在的推测 .讨论了 γMn基合金高阻尼行为的物理本质 .结果表明 ,γMn- Cu和 γMn- Fe合金顺磁→反铁磁转变引起的四方畸变均可触发微孪晶的形成 。The lattice distortion caused by paramagnetic→antiferromagnetic transition in γ Mn Cu alloy was evaluated according to the relationship between the lattice distortion and the magnetic long range order parameter. The calculation and experimental results are compared. It is revealed that the correlation between the antiferromagnetic ordering and high damping twins also exists in other γ Mn based alloys. The high damping capacity of γ Mn Fe alloy is experimental confirmed. The tetragonal distortion caused by paramagnetic→antiferromagnetic transition both in γ Mn Cu and γ Mn Fe alloys can trigger the formation of micro twins, it can also introduce martensitic transformation on some conditions. The physical nature of the high damping capacity of γ Mn based alloys was discussed.

关 键 词：γMn基合金 反铁磁畸变 高阻尼孪晶 γ锰基合金 

分 类 号：TG145[一般工业技术—材料科学与工程]