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Unusual Glass-Forming Ability of Bulk Amorphous Alloys Based on Ordinary Metal Copper

Xu, Donghua and Duan, Gang and Johnson, William L. (2004) Unusual Glass-Forming Ability of Bulk Amorphous Alloys Based on Ordinary Metal Copper. Physical Review Letters, 92 (24). Art. no. 245504. ISSN 0031-9007.

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We report the unusual glass-forming ability (GFA) of a family of Cu-based alloys, Cu46Zr47–xAl7Yx (0<x<=10, in at. %), and investigate the origin of this unique property. By an injection mold casting method, these alloys can be readily solidified into amorphous structures with the smallest dimension ranging from 4 mm up to 1 cm without detectable crystallinity. Such superior GFA is found primarily due to the alloying effect of Y, which lowers the alloy liquidus temperature and brings the composition closer to a quaternary eutectic. Other beneficial factors including appropriate atomic-size mismatch and large negative heat of mixing among constituent elements are also discussed.

Item Type:Article
Additional Information:©2004 The American Physical Society (Received 13 April 2004; published 16 June 2004) The authors thank the Defense Advanced Research Projects Agency, Defense Sciences Office, for their financial support under ARO Grant No. DAAD19-01-1-0525. Note added.—After submitting this manuscript, we learned that centimeter level bulk metallic glasses had been reported in Fe-based alloy systems very recently, by Lu et al. [31] and Ponnambalam et al. [32].
Subject Keywords:copper alloys; zirconium alloys; aluminium alloys; yttrium alloys; metallic glasses; glass transition; heat of mixing
Issue or Number:24
Record Number:CaltechAUTHORS:XUDprl04
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1454
Deposited By: Archive Administrator
Deposited On:19 Jan 2006
Last Modified:02 Oct 2019 22:43

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