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| CLASSIFICATION OF THE MARTENSITIC TRANSFORMATIONS |
| XU Zuyao (T Y.Hsu)(Shanghai Jiaotong University; Shang hai 200030) |
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Cite this article:
XU Zuyao (T Y.Hsu)(Shanghai Jiaotong University; Shang hai 200030). CLASSIFICATION OF THE MARTENSITIC TRANSFORMATIONS. Acta Metall Sin, 1997, 33(1): 45-53.
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Abstract 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.
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Received: 18 January 1997
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