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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 ,
Ling-Ling Shi ,
Jian Xu ,
Yi Li  and
En Ma
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: jianxu@imr.ac.cn
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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.”

Keywords

AlloyAmorphousMg
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 9 , September 2006 , pp. 2204 - 2214
Copyright
Copyright © Materials Research Society 2006

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