Cooperative shear in bulk metallic glass composites containing metastable β-Ti dendrites

• Main Authors: Zhang, L., Narayan, R. L., Sun, B. A., Yan, T. Y., Ramamurty, Upadrasta, Eckert, J., Zhang, H. F.
• Other Authors: School of Mechanical and Aerospace Engineering
• Format: Article
• Language: English
• Published: 2021
• Subjects: Science::Physics; Ductility; Fracture
• Online Access: https://hdl.handle.net/10356/145778
• Institution: Nanyang Technological University

We report a novel plastic deformation mechanism of bulk metallic glass composites (BMGCs) containing metastable β−Ti 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 ω−Ti band with a thickness of ∼10 nm in the β−Ti dendrite. The cooperative shear leads to serrated shear avalanches. The formation of narrow ω−Ti 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 ω−Ti formation.