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

被引：0
|
作者：
Y. Zhang
H. Tan
H. Z. Kong
B. Yao
Y. Li
机构：
[1] National University of Singapore,AMM&NS, Singapore
[2] Faculty of Sciences,Massachusetts Institute of Technology Alliance
[3] National University of Singapore,Department of Materials Science
[4] National University of Singapore,AMM&NS, Singapore
[5] Faculty of Sciences,MIT Alliance
[6] National University of Singapore,Department of Materials Science
来源：
Journal of Materials Research | 2003年 / 18卷
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摘要：
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.
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页码：664 / 671
页数：7
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