Surface severe plastic deformation (SSPD) has been demonstrated to improve the ductility of metallic glass. The physical interpretation, however, remains on the phenomenological level. In this study, a molecular dynamics (MD) simulation is carried out to elucidate the molecular mechanisms underlying the improvement in ductility. MD simulation reveals that shock waves resulting from SSPD can induce pre-deformed atoms, which are randomly embedded in the matrix of the metallic glass. The pre-deformed atoms have similar stress distribution and short-order structure as the matrix atoms, but with a larger atomic volume. When subjected to tensile or compressive stress, more shear bands are promoted by the pre-deformed atoms in the shock-treated sample as compared to the untreated one. The randomly distributed shear bands were found to experience more interactions, which delayed the catastrophic fracture, leading to increased ductility.
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Research Article| September 01 2017
Shocking of metallic glass to induce microstructure heterogeneity: A molecular dynamics study
Chi Ma ;
Chang Ye ;
Chi Ma, Guo-Xiang Wang, Chang Ye, Yalin Dong; Shocking of metallic glass to induce microstructure heterogeneity: A molecular dynamics study. J. Appl. Phys. 7 September 2017; 122 (9): 095102. https://doi.org/10.1063/1.5000366
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