Details

Autor(en) / Beteiligte

• Zhang, L.
• Narayan, R. L.
• Sun, B. A.
• Yan, T. Y.
• Ramamurty, U.
• Eckert, J.
• Zhang, H. F.

Titel

Cooperative Shear in Bulk Metallic Glass Composites Containing Metastable β -Ti Dendrites

Ist Teil von

• Physical review letters, 2020-07, Vol.125 (5), p.1-055501, Article 055501

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2020

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• 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.