Dresden 2006 – wissenschaftliches Programm
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MM: Metall- und Materialphysik
MM 13: Symposium Modern Metallic Materials Design III
MM 13.2: Vortrag
Dienstag, 28. März 2006, 10:30–10:45, IFW B
Ductile Cu-Zr- base bulk metallic glasses — •J. Das1,2, M.B. Tang3, K.B. Kim1, B.C. Wei4, W.H. Wang3, and J. Eckert1 — 1FG Physikalische Metallkunde, FB 11 Material- und Geowissenschaften, Technische Universität Darmstadt, Petersenstraße 23, D-64287 Darmstadt, Germany — 2IFW Dresden, Institut für Metallische Werkstoffe, Postfach 270016, D-01171 Dresden, Germany — 3Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China — 4Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China
Usually bulk metallic glasses exhibit strength values superior to conventional crystalline alloys, often combined with a large elastic limit and rather low Young’s modulus. However, the major drawback for engineering applications is their limited room temperature ductility and toughness due to the localized deformation processes linked to shear banding. In this work we report on a new class of metallic glass in a simple Cu-base alloy. Addition of 5 at.% Al increases the glass-forming ability of binary Cu50Zr50. The resulting Cu47.5Zr47.5Al5 glass exhibits high strength (2265 MPa) together with large room temperature ductility up to 18%. After yielding a strong increase in the flow stress is observed during deformation. The interaction and intersection of shear bands increases the flow stress of the material with further deformation, leading to a No-dqwork hardeningNo-dq-like behaviour and yields a continuous rotation of the shear angle up to fracture resulting in a high compressive ductility. This work was funded by the Chinesisch-Deutsches Zentrum für Wissenschaftsförderung (Grant No. GZ032/7) and the Deutsche Forschungsgemeinschaft (Grant Ec111/12)