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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 ,且在一定条件下可能诱发马氏体相变
According to the relationship between the lattice distortion and the parameters of the magnetic length sequence caused by the antiferromagnetic sequence, the lattice distortion caused by the paramagnetic → antiferromagnetic transition of γMn-Cu alloy is calculated, and the calculated values are compared with the experimental data. The high damping properties of γMn-Fe-based alloys were also tested to verify the existence of the same relationship between the antiferromagnetic sequence and twin damping in other Mn-based alloys. The physical nature of high damping behavior of γMn-based alloys was discussed. The tetragonal distortion caused by the paramagnetic → antiferromagnetic transition of γMn-Cu and γMn-Fe alloys can trigger the formation of micro-twins, and may induce martensitic transformation under certain conditions