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|Title:||Improving glass-forming ability of Mg-Cu-Y via substitutional alloying: Effects of Ag versus Ni||Authors:||Ma, H.
|Issue Date:||2006||Citation:||Ma, H., Shi, L.-L., Xu, J., Li, Y., Ma, E. (2006). Improving glass-forming ability of Mg-Cu-Y via substitutional alloying: Effects of Ag versus Ni. Journal of Materials Research 21 (9) : 2204-2214. ScholarBank@NUS Repository.||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." © 2006 Materials Research Society.||Source Title:||Journal of Materials Research||URI:||http://scholarbank.nus.edu.sg/handle/10635/86440||ISSN:||08842914|
|Appears in Collections:||Staff Publications|
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