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Glass-forming ability of Pr–(Cu,Ni)–Al alloys in eutectic system

Published online by Cambridge University Press:  31 January 2011

Y. Zhang ,
H. Tan ,
H. Z. Kong ,
B. Yao  and
Y. Li
Y. Zhang*
Affiliation:
AMM&NS, Singapore-Massachusetts Institute of Technology Alliance, National University of Singapore, Singapore 117576
H. Tan
Affiliation:
Department of Materials Science, Faculty of Sciences, National University of Singapore, Singapore 119260
H. Z. Kong
Affiliation:
Department of Materials Science, Faculty of Sciences, National University of Singapore, Singapore 119260
B. Yao
Affiliation:
Department of Materials Science, Faculty of Sciences, National University of Singapore, Singapore 119260
Y. Li
Affiliation:
AMM&NS, Singapore-MIT Alliance, National University of Singapore, Singapore 117576, and Department of Materials Science, Faculty of Sciences, National University of Singapore, Singapore 119260
*
a)Address all correspondence to this author. e-mail: smazy@nus.edu.sg
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Abstract

A eutectic point in Pr-rich Pr-(Cu,Ni)-Al alloys was experimentally determined by measuring the solidus temperature (Tm) and liquidus temperature (T1). It was found that Pr68(Cu0.5Ni0.5)25Al7 (at.%) is at the eutectic composition in the pseudoternary Pr–(Cu0.5Ni0.5)–Al alloys. The alloy Pr68(Cu0.5Ni0.5)25Al7 exhibits better glass-forming ability (GFA) than the ternary eutectic alloy Pr68Cu25Al7. However, the best GFA was obtained at an off-eutectic composition (Pr54[Cu0.5Ni0.5]30Al16) in the Pr–(Cu0.5Ni0.5)–Al alloys, which can be formed in fully amorphous rods with diameter of 1.5 mm by copper mold casting. Moreover, the glass-transition temperature Tg increases quickly (from 367 to 522 K) with the increasing of the Al content (from 3 to 27 at.%). The deviation of the best GFA composition from the eutectic point [Pr68(Cu0.5Ni0.5)25Al7] was explained in terms of the asymmetric coupled eutectic zone, the competition between growth of crystalline phase and formation of amorphous, and the higher glass-transition temperature Tg on the hypereutectic side.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 3 , March 2003 , pp. 664 - 671
Copyright
Copyright © Materials Research Society 2003

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