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Improving glass-forming ability of Mg−Cu−Y via substitutional alloying: Effects of Ag versus Ni

Published online by Cambridge University Press:  03 March 2011

Han Ma
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
Yi Li
Affiliation:
Department of Materials Science and Engineering, National University of Singapore, Singapore 117675, Singapore
En Ma
Affiliation:
Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, Maryland 21218
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Based on the best bulk metallic glass (BMG) forming alloy in the Mg−Cu−Y ternary system, we introduced Ag (or Ni) to partially substitute for Cu to improve the glass-forming ability (GFA). The objective of this paper is twofold. First, we illustrate in detail a recently developed search strategy, which was proposed but only briefly outlined in our previous publication [H. Ma, L.L. Shi, J. Xu, Y. Li, and E. Ma: Discovering inch-diameter metallic glasses in three-dimensional composition space. Appl. Phys. Lett. 87, 181915 (2005)]. The protocol to navigate in three-dimensional composition space to land large BMGs is spelled out step-by-step using the pseudo-ternary Mg−(Cu,Ag)−Y as the model system. Second, our ability to locate the best BMG former in the composition tetrahedron allows us to systematically examine, and conclude on, the effects of a given alloying element. The large improvement in glass-forming ability in the Mg−(Cu,Ag)−Y system relative to the based ternary will be contrasted with the reduced glass-forming ability in the Mg−(Cu,Ni)−Y pseudo ternary system. It is demonstrated that the improvement of glass-forming ability requires judicious choice of substitutional alloying elements and concentrations, rather than simple additions of multiple elements assuming the “confusion principle.”

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Articles
Copyright
Copyright © Materials Research Society 2006

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