Abstract
We report a novel plastic deformation mechanism of bulk metallic glass composites (BMGCs) containing metastable dendrites. Plastic deformation of the BMGCs beyond the ultimate tensile strength is mediated by cooperative shear events, which comprise a shear band in the glassy matrix and a continuous band with a thickness of in the dendrite. The cooperative shear leads to serrated shear avalanches. The formation of narrow bands is caused by high local strain rates during the cooperative shear. The cooperative shear mechanism enriches the deformation mechanisms of BMGCs and also deepens the understanding of formation.
- Received 11 April 2020
- Accepted 22 June 2020
DOI:https://doi.org/10.1103/PhysRevLett.125.055501
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