Cold-rolling induced residual stress effect on the shock response of crystalline-metallic glass (Cu-CuZr) nanolaminates by molecular dynamics simulation
KV Reddy and S Pal, MATERIALS CHEMISTRY AND PHYSICS, 272, 125010 (2021).
The effect of mechanical processing and thereby induced residual stress on the shock response of the crystallineamorphous nanolaminate is unexplored till date. Here, we have implemented molecular dynamics (MD) simulation to study the structural evolution of the cold-rolled crystalline Cu-metallic glass Cu63Zr37 nanolaminates during shock loading. Atomic stress analysis has revealed that specimen rolled from the metallic glass (MG) side accumulates compressive residual stress, whereas the specimen rolled from the crystalline side amasses tensile residual stress. The influence of the residual stress can be directly seen during the shock propagation through the pressure profiles, which shows reduced pressure for the specimen with tensile residual stress compared to the unrolled specimen. Also, presence of stress fields due to partial dislocations reduces the intensity of the compressive stress in the nanolaminates. It is found that generation of rarefaction wave at higher piston velocity causes formation of tensile residual stress at crystalline/amorphous interface.
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