DEFORMATION AND FRACTURE MECHANISMS OF TWO-PHASE TiAl-BASED ALLOYS WITH FULLY LAMELLAR MICROSTRUCTURE

Abstract

Abstract: A two-phase TiAl-based alloy with fully lamellar structure has been deformed al room temperature and the deformed microstructures have been examined in dtails by optical microscopy(OM), scanning electron microscopy(SEM) and transmission electron microscopy(TEM) . Deformation mechanisms in the γ-TiAl phase has been defined and the role of grain boundaries in the deformation and fracture has been assessed Some of the mechanisms of interactions between twinning or gliding dislocations and three types of γ γ domain boundaries or γ α_2 interface in a lamellar grain have been identified and resistance of the various domain boundaries or the interface to the propagation of twinning has been evaluated

Key words: TiAl, Deformation mechanism, Lamellae, Twinning

Y. G .Zhang, C. Q. Chen (Beijing University of Aeronautics and Astronautics, Beijing 100083, China)Q. Xu (Beijing Laboratory of Electron Microscopy, Chinese Academy of Sciences. Beijing,China)M. C. Chaturvedi (The University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2). DEFORMATION AND FRACTURE MECHANISMS OF TWO-PHASE TiAl-BASED ALLOYS WITH FULLY LAMELLAR MICROSTRUCTURE[J]. Acta Metallurgica Sinica (English Letters), 1995, 8(z1): 359-368.

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DEFORMATION AND FRACTURE MECHANISMS OF TWO-PHASE TiAl-BASED ALLOYS WITH FULLY LAMELLAR MICROSTRUCTURE

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