Interatomic potential to study plastic deformation in tungsten-rhenium alloys

Research output: Contribution to journalArticle

Institutes & Expert groups

  • IPUL - Institute of Physics of University of Latvia

Documents & links

DOI

Abstract

In this work, an interatomic potential for the W-Re system is fitted and benchmarked against experimental and density functional theory (DFT) data, of which part are generated in this work. Having in mind studies related to the plasticity of W-Re alloys under irradiation, emphasis is put on fitting point-defect properties, elastic constants, and dislocation properties. The developed potential can reproduce the mechanisms responsible for the experimentally observed softening, i.e., decreasing shear moduli, decreasing Peierls barrier, and asymmetric screw dislocation core structure with increasing Re content in W-Re solid solutions. In addition, the potential predicts elastic constants in reasonable agreement with DFT data for the phases forming non-coherent precipitates (r- and v-phases) in W-Re alloys. In addition, the mechanical stability of the different experimentally observed phases is verified in the temperature range of interest (700–1500 K). As a conclusion, the presented potential provides an excellent tool to study plasticity in W-Re alloys at the atomic level.

Details

Original languageEnglish
Article number165107
JournalJournal of Applied Physics
Volume121
DOIs
Publication statusPublished - 1 Jan 2017

Keywords

  • Density functional theory, grain boundaries, elastic moduli, solid solutions, equations of state

ID: 3068499