Issue 36, 2022, Issue in Progress

Individual cascade annealing in BCC tungsten: effects of size and spatial distributions of defects

Abstract

To investigate effects of size and spatial distributions of defects from primary damage to annealing of an individual cascade, molecular dynamics (MD) and object kinetic Monte Carlo (OKMC) are applied for simulating cascade generation and annealing. MD cascade simulations of tungsten are carried out with two typical embedded atom method potentials for cascade energies in the range from 0.1 to 100 keV at 300 K. The simulation results show that even though the number of survival defects varies slightly, these two potentials produce very different interstitial cluster (IC) size distribution and defect spatial distribution with cascade energies larger than 30 keV. Furthermore, OKMC is used to model individual cascade annealing. It demonstrates that larger-sized ICs and closely distributed SIAs in the cascade region will induce a much higher recombination fraction for individual cascade annealing. Therefore, special attention should be paid to the size and spatial distributions of defects for primary damage in the multi-scale simulation framework.

Graphical abstract: Individual cascade annealing in BCC tungsten: effects of size and spatial distributions of defects

Article information

Article type
Paper
Submitted
05 Jul 2022
Accepted
03 Aug 2022
First published
16 Aug 2022
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2022,12, 23176-23182

Individual cascade annealing in BCC tungsten: effects of size and spatial distributions of defects

L. Wei, C. Zhang, Q. Zheng, Z. Zeng and Y. Li, RSC Adv., 2022, 12, 23176 DOI: 10.1039/D2RA04138C

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