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合金中的马氏体是晶体点阵切变的产物,对于多晶材料,马氏体通常在各个晶粒中形核长大,但不跨越晶界,然而在Cu-Zn-Al形状记忆合金的研究中,我们观察到了马氏体穿晶界生长现象。记忆合金中的马氏体相变具有热滞后和驱动力小等特点,称为热弹性马氏体相变,马氏体穿晶界生长可能也是这类相变的一个特征。该现象既涉及马氏体相变理论本身,又与晶界问题密切相关,应该成为一个有趣的研究课题。
The martensite in the alloy is the product of crystal lattice shear deformation. For polycrystalline materials, the martensite usually nucleates and grows in each crystal grain, but does not cross the grain boundary. However, in a Cu-Zn-Al shape memory alloy In the study, we observed the growth of martensite intergranular growth. Martensitic transformation in memory alloy has the characteristics of thermal hysteresis and low driving force, which is called thermoelastic martensite transformation. The growth of martensite intergranular boundary may also be a feature of such phase transition. This phenomenon involves not only the martensite transformation theory itself, but also the grain boundary issue, which should become an interesting research topic.