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Origin of the plasticity in bulk amorphous alloys

Published online by Cambridge University Press:  31 January 2011

Jae-Chul Lee*
Department of Materials Science and Engineering, Korea University, Seoul 136-701, Korea
Kyoung-Won Park
Department of Materials Science and Engineering, Korea University, Seoul 136-701, Korea
Kyou-Hyun Kim
Department of Materials Science and Engineering, Korea University, Seoul 136-701, Korea
Eric Fleury
Division of Advanced Metals, Korea Institute of Science and Technology, Seoul 130-136, Korea
Byeong-Joo Lee
Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
Masato Wakeda
Department of Mechanical Engineering, Osaka University, Osaka 565-0871, Japan
Yoji Shibutani
Department of Mechanical Engineering, Osaka University, Osaka 565-0871, Japan; and Center of Atomic and Molecular Technologies, Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan
a)Address all correspondence to this author. e-mail:
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Unlike the dislocation-based plasticity in crystalline metals, which can be readily explained by their crystal structure and the presence of defects, the nature of the plasticity in amorphous alloys is not completely understood. Experiments have shown that the plasticity in amorphous alloys is strongly dependent on their atomic packing density. This study, based on the combination of experimental and computational techniques, examines the origin of the plasticity in amorphous alloys considering characteristics of the inherent atomic-scale structure as defined by short-range ordered (SRO) clusters. The role of various SRO atomic clusters in creating free volume during shear deformation is discussed. We report that the plasticity exhibited by amorphous alloys is very sensitive to the characteristics of the atomic packing state, which can be described by various SRO atomic structures and quantified by the effective activation energy for crystallization.


Copyright © Materials Research Society 2007

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