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Molecular dynamics study of the shear deformation in TiAl/Ti3Al system

Liu Yong-Li Zhang Zong-Ning Zhang Lin Zhao Xing Wang Shao-Qing Ye Heng-Qiang

Molecular dynamics study of the shear deformation in TiAl/Ti3Al system

Liu Yong-Li, Zhang Zong-Ning, Zhang Lin, Zhao Xing, Wang Shao-Qing, Ye Heng-Qiang
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  • Received Date:  29 December 2008
  • Accepted Date:  22 February 2009
  • Published Online:  21 December 2009

Molecular dynamics study of the shear deformation in TiAl/Ti3Al system

  • 1. (1)东北大学理学院,沈阳 110004; (2)东北大学理学院,沈阳 110004;辽宁工业大学数理科学系,锦州 121001; (3)中国科学院金属研究所,沈阳材料科学国家(联合)实验室,沈阳 110016

Abstract: The dynamical shear deformation induced hexagonal close-packed (HCP)face-centred cubic (FCC) processes in TiAl/Ti3Al system are investigated by the molecular dynamics method. The details of the dislocation initiation, the microstructure evolution and the force field effect are presented and discussed. The analyses of the potential variation and the structural snapshots show that the shear deformation is related to the “stick-slip” behaviour. The interface can transit the energy and counterpoise the deformation between the hetero-phases. The HCP-Ti3Al (FCC-TiAl) shows obvious (little) covariant deformation stage before the initiation of the fault transition. For HCP-Ti3Al, the final structure is the continued FCC stacking in a region with the large force field, and the FCC and HCP plates alternatively occur near the interface. For FCC-TiAl, twin and SISF are the main remnants, and the meta-stable HCP phase may occur with the increment of the force field.

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