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Doubling the Critical Size for Bulk Metallic Glass Formation in the Mg–Cu–Y Ternary System

Published online by Cambridge University Press:  03 March 2011

H. Ma ,
Q. Zheng ,
J. Xu ,
Y. Li  and
E. Ma
H. Ma
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
Q. Zheng
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
J. Xu*
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
Y. Li
Affiliation:
Department of Materials Science and Engineering, National University of Singapore, Singapore 117675, Singapore
E. Ma
Affiliation:
Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, Maryland 21218
*
a) Address all correspondence to this author.e-mail: jianxu@imr.ac.cn
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Abstract

Mg−Cu−Y alloys with optimal glass forming ability have been found at off-eutectic compositions. The critical size for bulk metallic glass formation at the pinpointed compositions more than doubles that of the previously discovered eutectic Mg65Cu25Y10 alloy, leading to fully glassy rods with near-centimeter diameters in the ternary system upon copper mold casting. The result is a striking demonstration of the strong composition dependence of the glass forming ability, as well as of the need to scrutinize off-eutectic compositions. The implications of the discovery are discussed.

Keywords

AlloyMetallic glassX-ray diffraction (XRD)
Type
Rapid Communications
Information
Journal of Materials Research , Volume 20 , Issue 9 , September 2005 , pp. 2252 - 2255
Copyright
Copyright © Materials Research Society 2005

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