摘要
马氏体用变按动力学分为变温相变和等温相变按热力学和界面动态分为热弹性相变、近似热弹性相变和非热弹性相变，其判据为（1）临界相变驱动力小，热滞小；（2）相界面能往复（正、逆）运动；（3）形状应变由弹性协作，马氏体内的弹性储存能对逆相变驱动力作出贡献按形核机制分为近似局域软模形核和层错形核，前者母相强化阻碍相变开动；后老母相强化不影响从。
Kinetically, martensitic transformation may be classified as athermal and isothermal transformations. According to thermodynamics and interface motion characteristics, martensitic transformation may be divided into thermoelastic, semi-thermoelastic and non-thermoelastic transformations. Criterions for thermoelastic transformation can be drawn as: (1) a small critical driving force and a small hysteresis; (2) reversibility of the motion of the interface between martensite and parent phases. (3) the shape strain is accommodated elastically and the stored energy is available to contribute a part of the driving force for the reverse transformation. From different nucleation processes, the martensitic transformation may be classified as: (1) nucleation nearly through the local soft mode in which the parent strengthening hinders the onset of the transformati0n; and (2) nucleation by stacking fault in which the parent strengthening does not affect the M, markedly and there will not appear a considerable lowering of the Young's modulus at the temperature interval of the internal friction peak exhibition as a result of the martensitic transformation fcc→ hcp. Thequasi-martensitic transformation may be termed for a martensitic transformation with week first order.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1997年第1期45-53,共9页
Acta Metallurgica Sinica
关键词
马氏体
相变
分类
金属
classification of martensitic transformation,semi-thermoelatic transformation, local soft mode, nucleation by stacking fault, quasi-martensitic transformation
