Molecular dynamics study on microscale residual stress of graphene/aluminum nanocomposites by selective laser sintering
The fabrication of graphene/metal matrix composites by selective laser sintering(SLS)technique has been exten-sively studied;however,the complex microstructure and residual stress limit their further applications.Herein,the sintering behavior of graphene/aluminum(Gr/Al)com-posites is studied using an all-atom model.The effect of sintering temperature and Al particle size on densification is investigated based on molecular dynamics(MD)simu-lations.The results reveal that the higher sintering tem-perature and smaller particle size are conducive to the improved sintering quality of Gr/Al composites.Then,a large-scale laser sintering model of Gr/Al composites is established and the sintering process is simulated using optimal sintering parameters.The evolution of microstructure and residual stress of Gr/Al composites during SLS are investigated in detail.The results indicate that the epitaxial growth of Al grains plays a dominant role in grain growth,promoting the formation of nanoscale single crystals.Therefore,stress concentration occurs at the voids,microcracks and Gr/Al interfaces,but not at the stacking faults.What's more,the distribution characteris-tics of residual stress components in Gr/Al composites are affected by Gr/Al interaction.
graphene、molecular、dynamics、stress、laser、study、aluminum、microscale、nanocomposites、residual
41
O4;R735.1;S
2023-01-12（万方平台首次上网日期，不代表论文的发表时间）
共7页
3677-3683
