Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 518, Issue -, Pages 334-341Publisher
ELSEVIER
DOI: 10.1016/j.jnucmat.2019.03.018
Keywords
Plasma exposure; Nano-indentation; CPFEM; Tungsten; Dislocations
Funding
- National Natural Science foundation of China (NSFC) [11802344]
- Central South University
- Euratom research and training programme 2014-2018 [755039]
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In this work, the nano-indentation of plasma-exposed tungsten is simulated at room temperature and elevated temperature (300-700 K) by the recently developed crystal plasticity finite element model. A nonlinear function is applied to characterize the depth profile of plasma-induced dislocation density in the sub-surface region. The model parameters are calibrated by comparing the simulated results with corresponding experimental data at 300 K for both the force-depth and hardness-depth relationships. Furthermore, the mechanical responses of plasma-exposed tungsten are predicted at 500 K and 700 K in order to characterize the plasma effect at the fusion-relevant operational temperature. The dominant results and conclusions are that: (1) The heterogeneously distributed dislocations in the sub-surface region induced by the plasma exposure are responsible for the increase of hardness at 300 K. (2) The plasma-induced microstructural modification does not yield to considerable increase of hardness at operational temperature. (3) The expansion of the plastic zone in the sub-surface region is, to some extent, limited by the presence of plasma-induced dislocations. Whereas, the increase of temperature can effectively reduce this limitation. (C) 2019 Elsevier B.V. All rights reserved.
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