Crystal plasticity finite element method simulation for the nano-indentation of plasma-exposed tungsten
(2019) Journal of Nuclear Materials — Vol. 518, p. 334-341 (2019)
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- Authors
Zinovev, Aleksandr 
- Abstract
- 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.
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Citations
Xiao, X., Terentyev, D., Bakaev, A., Zinovev, A., Dubinko, A., & Zhurkin, E. E. (2019). Crystal plasticity finite element method simulation for the nano-indentation of plasma-exposed tungsten. Journal of Nuclear Materials, 518, 334-341. https://doi.org/10.1016/j.jnucmat.2019.03.018 (Original work published 2019)