A dislocation-based crystal viscoplasticity model with application to micro-engineered plasma-facing materials
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- 作者：David Rivera ; Yue Huang ; Giacomo Po ; Nasr M. Ghoniem ; ghoniem@ucla.edu
- 关键词：Tungsten ; Thermomechanics ; Plasma transients ; Surface architecture ; Residual stress
- 刊名：Journal of Nuclear Materials
- 出版年：2017
- 出版时间：March 2017
- 年：2017
- 卷：485
- 期：Complete
- 页码：231-242
- 全文大小：1593 K
- 卷排序：485
文摘
Materials developed with special surface architecture are shown to be more resilient to the transient thermomechanical plasma transients. A dislocation-based model is extended within the framework of large deformation crystal plasticity. The model is applied to the deformation of single crystals, polycrystals, and micro-engineered surfaces. The model is utilized to design tapered surface micro-pillar architecture, composed of a Re core and W coatings. Residual stresses generated by cyclic thermomechanical loading show that the surface can be in a compressive stress state, thus mitigating surface fracture.