片层状TiAl-Nb合金中γ/γ界面体系拉伸行为的原子模拟

doi:10.11896/cldb.21080280

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Abstract During the plastic deformation of TiAl based alloy with fully lamellar structure, the strain energy required by dislocation movement will be increased due to the existence of multiple interfaces which can hinder dislocation migration. Therefore, the deformation ability and strength are strongly dependent on the lamellar interface in the microstructure. In this work, the deformation behavior of TiAl-Nb alloy with γ/γ interface under uniaxial tensile loading has been studied by the molecular dynamics method. The mechanical response, dislocation evolution and fracture mechanism of lamellar TiAl-Nb alloy under TT (true-twin), RB (rotational boundary) and PT (pseudo-twin) have been discussed on the atomic scale. The relationship between mechanical response and microstructure evolution of TiAl-Nb alloys was described. It is shown that the mechanical pro-perties of TiAl-Nb alloys with different interfaces have a significant layered boundary effect. By observing the interaction between the dislocation and the interface, it is found that after the encounter of the dislocation and the interface, disordered atomic regions can be generated in and around the three interfaces. However, the disordered atomic region in RB/PT sample, as the source of dislocation, will emit the dislocation to another layer, while the disordered atomic region in TT sample will not act as the source of dislocation to another layer.

Key words： TiAl-Nb alloy interface dislocation deformation behavior molecular dynamics

Published: Online: 2023-03-27

CLC number:

TG146

Fund:National Natural Science Foundation of China (52065036), Natural Science Foundation of Gansu (20JR5RA448), the Hongliu First-class Disciplines Development Program of Lanzhou University of Technology.

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	Articles by authors
	ZHANG Jun
	FENG Ruicheng
	YAO Yongjun
	YANG Shengze
	CAO Hui
	FU Rong
	LI Haiyan

Cite this article:

ZHANG Jun,FENG Ruicheng,YAO Yongjun, et al. Atomic Simulation of Tensile Behavior of γ/γ Interface System in Lamellar TiAl-Nb Alloy[J]. Materials Reports, 2023, 37(6): 21080280-6.

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http://www.mater-rep.com/EN/10.11896/cldb.21080280 OR http://www.mater-rep.com/EN/Y2023/V37/I6/21080280

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