Molecular dynamics study on irradiation damage of single crystal tungsten

doi:10.7523/j.ucas.2022.087

Abstract

Abstract: Tungsten has been considered the most suitable plasma facing material in magnetic confinement fusion devices due to its excellent physical and chemical properties. However, studies on the defect evolution of tungsten metal under high-energy neutron irradiation are still insufficient. In this paper, the evolution of radiation damage in single crystal tungsten was simulated by using molecular dynamics method. The effects of incident energy, load, and impurity atoms on the evolution of radiation damage, as well as the effects of radiation defects on the mechanical properties of single crystal tungsten were investigated. The results show that the retention of carbon and hydrogen in the tungsten lattice increases the irradiation defects to some extent, with the effect of carbon being more significant than that of hydrogen. Compressive load has a certain inhibitory effect on irradiation defects, while tensile load has the opposite effect. Frenkel defects caused by irradiation can promote the emission of dislocations and hinder the movement of dislocations.

Key words: molecular dynamics, particle irradiation, tungsten, plasma facing material (PFM)

CLC Number:

O551.3

LIU Songchang, YU Xin'gang. Molecular dynamics study on irradiation damage of single crystal tungsten[J]. Journal of University of Chinese Academy of Sciences, 2024, 41(4): 452-460.

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