First-principles calculations of mechanical,thermal properties and radiation resistant of tungsten/graphene/tungsten composite as plasma facing materials
First-principles calculations were conducted to investigate the changes in mechanical and thermal properties of tungsten/graphene/tungsten composites,and the performance attenuation under plasma irradiation was evaluated via simulated irradiation damage by helium-vacancy associative defect.The calculation results show that the bulk modulus,Young's modulus and shear modulus of the tungsten/graphene/tungsten composites decrease to a certain extent,but the ductility is improved.The tungsten/graphene/tungsten composites increase thermal expansion coefficient at high temperatures compared with pure tungsten,but have a higher minimum thermal conductivity.The unique mechanism by the graphene interface layer can absorb impurities and defects in the matrix,which can result in tungsten/graphene/tungsten composite has smaller attenuation in mechanics,thermal expansion coefficient and minimum thermal conductivity.This shows the potential of tungsten/graphene/tungsten composites in radiation resistance.
国家科技期刊平台
NSTL
万方数据
维普
