【摘要】 本文测出了金镉(Au-Cd)合金在正反马氏体相变过程的低频内耗峰,内耗极大值与变温速率有线性关系,但比Fe-Mn等非热弹性马氏体相变内耗的速率依赖要小得多,稳定内耗峰(变温速率为零)在每一温度的内耗值与频率无关,是静滞型损耗。内耗峰高与马氏体晶粒尺寸有关。等温转变过程也出现一个内耗-时间峰。根据以上诸实验事实,我们认为,低频马氏体相变内耗是由那些在振动应力作用下可以运动的相界面所引起的。更多还原

【Abstract】 The internal friction peak associated with the process of martensite and reverse martensite transformation in Au-Cd alloy were measured by torsion pendulum. There is a linear relation between the peak value and rate of heating. The stable peak (heating rate=0) is much higher than that of Fe-Mn alloy and the internal friction value is independent of frequency which is characteristic of static hysteresis loss. The height of the internal friction peak is related to the grain size of Martensites. There also appears a peak during the process of isothermal martensite transition According to these experimental results, we attributed this internal friction induced by martensite transition to those movable coherent interface under the action of vibrating stress.更多还原