Study on the factors influencing the mechanical properties of bimodal nanotwinned Cu-Ag alloys

YR Zhi and QY Tang and F Zhang and A Guo and H Yang and K Liu and WL Ye, MATERIALS TODAY COMMUNICATIONS, 31, 103586 (2022).

DOI: 10.1016/j.mtcomm.2022.103586

The nanoscale microstructures of metals and alloys are well recognized to influence their strength and plastic deformability. In order to understand specifically the mechanism by which twinning in the ultrafine grain region affects the mechanical properties of bimodal Cu-Ag alloys, we investigate the deformation of bimodal twinned Cu-Ag alloys under uniaxial stretching by molecular dynamics (MD) simulations. The experimental simulations reveal that the coarse grain size and Ag atom volume fraction have important effects on the mechanical behavior of the bimodal nanotwinned Cu-Ag alloy. Ultrafine nanotwinned grains are endowed with high strength due to the twinning boundary strengthening effect. More HCP structures are generated with more capacity to store some of the dislocations in the coarse crystalline region, thus contributing to the ductility of the bimodal twinned CuAg alloy. The dependence of stress on coarse grain size and Ag atom volume fraction is discussed in detail in this paper.

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