Abstract
Considering long-term application of the nanocrystalline metals in space, the influence of the nano-scale void is investigated via molecular dynamics (MD). The deformation of nanocrystalline metals involves not only intragranular but also grain boundary (GB) deformation, and it is one of the important factors to explain the material characteristics. Due to this deformation mechanism, the nanocrystalline metals have the possibility to show the characterisitc for the nano-scale void that varies from conventional metals. Therefore focusing on the nano-scale voids, we perform uniaxial tensile test with the nanocrystalline and perfect crystal Aluminum. As the results, following two findings are acquired. 1) As to the nanocrystalline models, there is no obvious influence of the nano-scale voids. 2) As to the perfect crystal models, the dislocation activities around the nano-scale voids decrease maximum stress.
