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Formation of Mg–Cu–Ni–Ag–Zn–Y–Gd Bulk Glassy Alloy by Casting into Cone-shaped Copper Mold in Air Atmosphere

Published online by Cambridge University Press:  01 June 2005

E.S. Park  and
D.H. Kim
E.S. Park
Affiliation:
Center for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul 120-749 Korea
D.H. Kim*
Affiliation:
Center for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul 120-749 Korea
*
a) Address all correspondence to this author. e-mail: dohkim@yonsei.ac.kr
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Abstract

A new Mg–Cu–Ni–Ag–Zn–Y–Gd alloy with significantly improved glass forming ability (GFA) was developed in this work. Mg65Cu7.5Ni7.5Ag5Zn5Y5Gd5 bulk metallic glass (BMG) with a diameter of 14 mm was successfully fabricated by conventional copper mold casting method in air atmosphere. The critical cooling rate for glass formation was estimated to be about 20 K/s. When the maximum diameter for glass formation was compared with those previously reported for Mg-based alloys, the Mg65Cu7.5Ni7.5Ag5Zn5Y5Gd5 alloy showed the highest GFA. However, when the GFA was compared with those of Mg-TM-RE alloys (TM: Cu, Ni, Zn, and Ag; RE: Y and Gd), the significant improved GFA of the Mg–Cu–Ni–Zn–Ag–Y–Gd alloy cannot be properly represented by ΔTx, Trg, K, and γ parameters. In contrast to most of the Mg-based BMGs reported so far, the Mg65Cu7.5Ni7.5Ag5Zn5Y5Gd5 BMG exhibits yielding and plastic deformation during compressive loading.

Keywords

Mechanical propertiesMetallic glass
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 6 , June 2005 , pp. 1465 - 1469
Copyright
Copyright © Materials Research Society 2005

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