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Superior glass-forming ability of CuZr alloys from minor additions

Published online by Cambridge University Press:  01 July 2006

P. Yu ,
H.Y. Bai  and
W.H. Wang
P. Yu
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Repubic of China
H.Y. Bai*
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Repubic of China
W.H. Wang
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Repubic of China
*
a) Address all correspondence to this author. e-mail: hybai@aphy.iphy.ac.cn
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Abstract

We report a novel phenomenon in which minor element additions (∼1 at.%) can dramatically enhance the glass-forming ability (GFA) of CuZr(Al) metallic alloy, which can be cast into glasses with large cross-section sizes using a conventional casting method. The minor additions cause the liquidus temperature Tl to decrease from 1219 (for Cu50Zr50) to 1139 K [for (Cu50Zr50)92Al7Gd1], and the reduced glass transition temperature Trg (=Tg/Tl) of the alloys increases from 0.550 (for Cu50Zr50) to 0.613 [for (Cu50Zr50)92Al7Gd1]. The mechanism involved in the achievement of the superior GFA is explained by the stronger tendency of short-range ordering in the stronger microalloyed alloys as well as the thermodynamic and kinetic aspects.

Keywords

AlloyAmorphousMetalPACS: 81.05.Kf, 61.43.Dq, 64.70.Kb, 61.10.Nz
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 7 , July 2006 , pp. 1674 - 1679
Copyright
Copyright © Materials Research Society 2006

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