期刊
ACTA MATERIALIA
卷 57, 期 11, 页码 3253-3267出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2009.03.027
关键词
Metallic glass; Structure; Mechanical property; Plasticity
资金
- US-DoE-BES, Division of Materials Sciences and Engineering [DE-FG02-09ER46056]
Recent reports Suggest that Poisson's ratio (v), or the related ratio of shear modulus G to bulk modulus B, indicates the potential of metallic glasses (MGs) to sustain plastic strain. Using molecular dynamics Simulations of the Cu64Zr36 MG as a representative, we demonstrate why and how these elastic and plastic properties are correlated, in terms of the common structural origin underlying these mechanical behaviors in MGs. The full icosahedral ordering has been identified as the key structural feature in the Cu-Zr MGs that controls not only the G and the GIB (or v), but also the initiation of shear localization and the intrinsic plasticity. Additional analysis of the Cu-Zr MGs of different compositions and MGs in different alloy systems reveals a general correlation of the plasticity with the G/B ratio, as the latter is able to represent and couple the effects of both the atomic configuration and the alloy composition. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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