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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。
Martensitic transformation is a non-diffusive displacement-type transformation. For a given material, the surface relief caused by shear is one of the main features of martensitic transformation, which corresponds to the only shear angle. Therefore, the shear mechanism of the martensitic transformation can be verified by comparing the shear angle determined experimentally with the theoretical shear angle predicted by the martensitic crystallographic representation theory (PTMC). This article presents several examples to verify the shear mechanism of martensitic transformation. In these examples, AFM was used to accurately determine the buoyancy angle of the martensitic transformation, and then the phase transformation shear angle was calculated based on the surface buoyancy angle. Finally, the calculated phase change shear angle was compared with the PTMC predicted Theoretical shear angle are compared to verify the correctness of the martensitic transformation mechanism. The examples presented in this paper can not negate Professor Liu Zongchang’s theory that the mechanism of martensitic transformation is lack of experimental evidence and the conclusion that martensite transformation does not change the mechanism.