Irradiation effect on mechanical properties of tungsten from molecular dynamic simulation

•Irradiation has quite different effects on mechanical properties of monocrystalline and nanocrystalline W.•Nanocrystalline W with smaller nanoparticles possesses higher tensile strength under irradiation.•The derived results could provide a deep understanding of irradiation effects on monocrystalli...

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Bibliographic Details
Published in:Materials letters 2019-04, Vol.241, p.27-30
Main Authors: Chen, L., Li, L.Q., Gong, H.R., Fan, J.L., Li, Wei
Format: Article
Language:English
Subjects:
Grain boundaries
Irradiation
Materials science
Mechanical properties
Molecular dynamics
Nanocrystals
Nanoparticles
Radiation damage
Simulation
Simulation and modelling
Tensile strength
Tungsten
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Summary:•Irradiation has quite different effects on mechanical properties of monocrystalline and nanocrystalline W.•Nanocrystalline W with smaller nanoparticles possesses higher tensile strength under irradiation.•The derived results could provide a deep understanding of irradiation effects on monocrystalline and nanocrystalline W. Molecular dynamic simulation has been conducted to investigate the irradiation effects on mechanical properties of monocrystalline and nanocrystalline W samples. It is found that irradiation has quite different effects on mechanical properties of monocrystalline and nanocrystalline W, i.e., the ideal tensile strength of monocrystalline and nanocrystalline W decreases and increases with the increase of irradiation energy, respectively. In addition, nanocrystalline W with smaller nanoparticles possesses higher tensile strength under irradiation, which is fundamentally due to more grain boundaries absorbed with more interstitial atoms. The derived results could provide a deep understanding of irradiation effects on monocrystalline and nanocrystalline W.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2019.01.043