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Martensitic phase transformation is an important style of nondispersive solid state change. Shape memory effect of shape memory alloy (SMA) was just discovered in this transformation. Generating, growing and spreading of martensitic phase transformation belt are the major areas of SMA research. Interface of martensitic phase transformation of NiTi polycrystal SMA under the tensile stress is studied by using Moire interference technique in the paper. Also ANSYS software is used to simulate the process of martensitic phase transformation under the same condition. These two methods get the uniform result, thus providing some reference to the further application study of SMA.

The mutual transformation of Martensite and Austensite and propagation of their interface are studied with the fourbeam moire interferometry during the process of loading of polycrystalline NiTi shape memory alloys (SMA). The distribution of Austensite and Martensite and the extension nearby the interface is observed from the moire photographs when the specimen is transformed.