梯度纳米结构多晶铝剪切变形的分子动力学模拟

doi:10.19976/j.cnki.43-1448/TF.2022020

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Abstract Gradient nanopolycrystalline structured metals are receiving increasing attention due to their unique plastic deformation mechanism and possible mechanical property enhancement. In this paper, the effect of different gradient nanostructures on the shear deformation behavior is investigated using a molecular dynamics approach. By comparing the dislocation evolution and atomic structure of grains during shear deformation of different gradient nanostructures, it is found that the deformation mechanisms of different gradient nanostructures are basically the same in the initial and intermediate stages of shear deformation process, with a large number of dislocations moving and accumulating at the grain boundaries, and then passing through the grain boundaries and finally releasing at the grain surface. In the middle and later stages of the deformation process, the different gradient nanostructures behave differently. For structures with higher shear strength, there is no shear band through multiple grains after shear deformation, and some of the coarse grains are broken into several smaller grains due to the large difference between grain orientation and shear direction and grain rotation, while the fine grains do not change significantly. The shear strength of the smaller structures is seriously affected by the shear bands formed during shear deformation due to dislocation plugging and release and interconnection of grain boundaries.

Key words： gradient nanostructures polycrystalline aluminum molecular dynamics shear deformation dislocation

Received: 09 March 2022 Published: 15 November 2022

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	HUANG Qianru
	LIU Jianghui
	KONG Yi
	DU Yong

Cite this article:

HUANG Qianru,LIU Jianghui,KONG Yi, et al. Molecular dynamics simulation of shear deformation of gradient nanostructured polycrystalline aluminum[J]. Materials Science and Engineering of Powder Metallurgy, 2022, 27(5): 453-459.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2022020 OR http://pmbjb.csu.edu.cn/EN/Y2022/V27/I5/453

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