用透射电镜对Ni-Ti形状记忆合金中母相?马氏体可逆转变进行了动态观察。利用高分辨电子显微术研究了该合金相变温度上下的结构变化。结果表明,马氏体与奥氏体的取向关系为:[111]_A∥[110]_M,[110]_A∥[001]_M,(110)_A∥(001)_M,(110)_A与(010)_M间夹角为6.5°左右;马氏体的晶体缺陷多为孪晶和层错,新发现有孪晶而为(100)的孪晶。
The reversible transformation between matrix and martensite in Ni-Tishape memory alloys has been dynamically observed under TEM. The orientationrelation between martensite and austenite as well as the structural change near thetransition temperature have been also studied with the help of HREM and SADP.The results show that the orientation relation between martensite and austenite is[111]_A//[110]_M, [110]_A//[001]_M, (110)_A/(001)_M and the angle between (110)_A and (010)_Mis about 6.5°. The crystal defects of martensite are found to be twin and stackingfault, and the twin plane as (100).
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