Modelling the brittle-to-ductile transition of high-purity tungsten under neutron irradiation

JOURNAL OF NUCLEAR MATERIALS

卷:554

Article

Vrielink, M. A. Oude¹  Shah, V¹  van Dommelen, J. A. W.¹  Geers, M. G. D.¹ 

[1] Eindhoven Univ Technol, Dept Mech Engn, Eindhoven, Netherlands

关键词: Cluster dynamics;    Crystal plasticity;    Tungsten;    Neutron irradiation;    Irradiation hardening;    Brittle-to-ductile transition temperature;   

DOI  :  10.1016/j.jnucmat.2021.153068

来源: Elsevier

【 摘 要 】

Tungsten becomes significantly more brittle when exposed to neutron irradiation, which can be detrimental for the functionality of plasma facing components in nuclear fusion reactors. A predictive model of the mechanical behaviour of irradiated tungsten is therefore vital in order to assess how the brittle to-ductile transition temperature evolves under fusion conditions. To this end, a cluster dynamics model is used to describe the defect production in high purity tungsten under neutron irradiation. The resulting defect concentrations provide input for a crystal plasticity model, capable of describing the influence of irradiation induced defects on the mechanical properties of high-purity tungsten. Simulation results reveal a striking match with experimental data in terms of yield stress at various temperatures and irradiation levels. Moreover, also the brittle-to-ductile transition temperature is adequately described by incorporating a probabilistic cleavage model. (c) 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license ( http://creativecommons.org/licenses/by/4.0/ )

【 授权许可】

Free