Two-stage work-hardening of a transformable B2-enhanced metallic glass composite by molecular dynamics simulation

SX Li and JQ Wu and XR Chen and MX Zhu and JP Chen and P Xue and YJ Huang and MJ Tan and YZ Yang and XL Fu, COMPOSITES COMMUNICATIONS, 51, 102045 (2024).

DOI: 10.1016/j.coco.2024.102045

The crystalline-amorphous interfaces play vital roles in affecting martensitic transformation, shear band nucleation and interface stability. Though both quasi-static and dynamic mechanical behaviors of shape memory enhanced bulk metallic glass composites have been studied via experiments, the atomic-level interactions among martensitic transformation, localized shear softening and interfacial strain concentration imposed by strain rate remain elusive. We employ molecular dynamics simulations to study strain rate effect on uniaxial compression behavior of transformable B2-CuZr enhanced bulk metallic glass composite. As strain rate increases, the proportion of martensitic transformation accelerates. During the competition among martensitic transformation induced-hardening, shear induced-softening and interface debonding, a two-stage work-hardening is observed, which is in agreement with experimental findings.

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