Jianli Shao^1,2,*, Weidong Wei¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.26, No.4, pp. 1-1, 2023, DOI:10.32604/icces.2023.09101

Abstract This report mainly introduces our recent research on the shock-induced collapse, migration and coalescence of He bubbles in metal based on atomistic simulations. The He bubble will be compressed to permanent deformation with the finite plastic collapse of metal. Under strong shock, the He bubble can be breakdown by the nano-jet of the metal, but it returns to a reduced sphere in the molten metal after long-time evolution, driven by the He-Al interface energy. Besides, the shock-induced migration of He bubble is revealed, which can be divided into shock acceleration and the following inertial motion. Moreover, two coalescence modes caused… More >

Qishan Huang¹, Haofei Zhou^2,*

The International Conference on Computational & Experimental Engineering and Sciences, Vol.25, No.3, pp. 1-1, 2023, DOI:10.32604/icces.2023.010014

Abstract Nanostructured metals contain vast amount of grain boundaries which are crucial to their mechanical behaviors. The plastic deformation mechanisms mediated by grain boundaries have been attracted increasing attentions in recent years. Our recent studies have been focused on using atomistic simulations to understand the grain boundary mediated plastic deformation mechanisms including deformation twinning initiated by dislocation nucleation from grain boundaries [1], cyclic plastic deformability governed by reversible slip of grain boundary dislocations [2], and extreme shear deformation of nanocrystals induced by twin boundary sliding [3]. We have also proposed a misorientation-dependent model to explain the transition between grain boundary migration… More >