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Mg-based bulk metallic glasses: Elastic properties and their correlations with toughness and glass transition temperature

Published online by Cambridge University Press:  04 March 2011

Shao-Gang Wang ,
Ling-Ling Shi  and
Jian Xu
Shao-Gang Wang
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Ling-Ling Shi
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Jian Xu*
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
*
a)Address all correspondence to this author. e-mail: jianxu@imr.ac.cn
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Abstract

In this work, elastic properties of Mg-based bulk metallic glasses (BMGs) with different chemical compositions were investigated. By compositional tuning in the quaternary Mg–Cu–Ag–Y alloys, the Poisson’s ratio ν of 0.332 is achieved at Mg56Cu21Ag14Y9 BMG, in excess of the previously suggested critical value (ν = 0.31–0.32) for the brittle-to-tough transition in metallic glasses. With the properties of the constituent elements, the predicted values of the bulk modulus B and shear modulus μ of Mg-based BMGs are 8% and 10% greater than the measured value, respectively. Notch toughness KQ of the ten investigated Mg-based BMGs varies between 3.6 and 8.2 MPa√m. Intrinsic brittleness of Mg glass is associated with its tiny plastic zone size (in micrometer scale) and weak resistance to crack propagation. The toughness variations are lack of significant correlation with the ν or μ. Among the investigated alloys, the Mg59.5Cu22.9Ag6.6Gd11 BMG manifests a good combination of improved toughness and high glass-forming ability.

Keywords

AlloyAmorphousElastic Properties
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 7 , 14 April 2011 , pp. 923 - 933
Copyright
Copyright © Materials Research Society 2011

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