极端应变率下钨孔洞演化及其力学响应的分子动力学模拟

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Abstract Molecular dynamics simulation was used to investigate the void evolution in single-crystal tungsten under uniaxial compression at extreme high strain rate (10⁸-10¹¹ s^-1), and the mechanical properties were also tested. The results show that the yield strength and Young’s modulus decrease as a function of void radius. The plastic behavior of tungsten with different radius of void shows similar feature with the increase of strain rate. At $\dot{\varepsilon }$≥5×10¹⁰ s^-1, the single crystal tungsten is changed into an amorphous structure. The amorphization of tungsten with void is delayed in comparison to perfect tungsten crystal ($\dot{\varepsilon }$≥10¹⁰ s^-1). At$\dot{\varepsilon }$≤10¹⁰ s^-1, before amorphization, the evolution of void during deformation the synergic effect of dislocation generation and twinning. The detailed plastic behavior follows: 1) The emission of 1/2[111] dislocation loop. 2) The decomposition of 1/2[111] screw dislocation. 3) The formation of (112)$[\bar{1}\bar{1}1]$twins, 4) the collapse of void.

Key words： extreme high strain rate molecular dynamics simulation void plastic deformation dislocation

Received: 01 June 2020 Published: 18 September 2020

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TG146.48

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	Articles by authors
	BAI Xiaodan
	CHEN Xun
	MA Yunzhu
	LIU Wensheng
	LIANG Chaoping

Cite this article:

BAI Xiaodan,CHEN Xun,MA Yunzhu, et al. Molecular dynamics simulation of void evolution and its mechanical response in single-crystal tungsten under extreme strain rate[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(4): 288-295.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I4/288

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