马氏体相变切变机制的实验验证——兼评刘宗昌教授马氏体相变的非切变机制

Experimental verification of shear mechanism of martensitic transformation——and comment on Liu Zongchang's non-shear mechanism

马氏体相变是无扩散的位移型相变,对于一个给定的材料,由切变产生的表面浮突是马氏体相变的主要特征之一,它对应唯一的切变角。因此,通过实验确定的切变角与马氏体晶体学表象理论(PTMC)预测的理论切变角进行对比,可以验证马氏体相变的切变机制。本文列举了几个例子来验证马氏体相变的切变机制。在这些例子中,首先原子力显微镜被用于精确测定马氏体相变的浮突角,然后基于表面浮突角计算出相变切变角,最后将计算的相变切变角与PTMC预测的理论切变角进行比较,由此验证马氏体相变切变机制的正确性。本文所举例子足以否定刘宗昌教授的马氏体相变切变机制缺乏实验依据的观点和马氏体相变非切变机制的结论。

The martensitic transformation is a diffusionless and displacive transformation,and the surface relief caused by shear,as one of major features of martensitic transformation,corresponds to unique shear angle for a given material.Therefore,the shear angle determined by experiment can be used to verify the shear mechanism of martensitic transformation by comparing with the theoretical shear angle predicted by phenomenological theory of martensite crystallography（PTMC）.Several examples were selected to verify the shear mechanism of martensitic transformation.In these examples,atomic force microscopy was at first used to accurately measure the surface relief angle,and then the shear angle was calculated based on the surface relief angle,finally the calculated shear angle was compared with the theoretical shear angle predicted by PTMC.The results in these examples verify the correctness of the shear mechanism of martensitic transformation.These examples effectively deny Liu Zong-chang＇s viewpoint on the lack of experimental basis on shear mechanism of martensitic transformation and his conclusion on non-shear mechanism.