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Structural origin of the high glass-forming ability in Y-doped bulk metallic glasses

Published online by Cambridge University Press:  31 January 2011

Liang Yang ,
Gu-Qing Guo ,
Guo-Qing Zhang  and
Lian-Yi Chen
Gu-Qing Guo
Affiliation:
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, People's Republic of China
Guo-Qing Zhang
Affiliation:
Key Laboratory of Advanced Textile Materials and Manufacturing Technology (Zhejiang Sci-Tech University), Ministry of Education, Hangzhou 310018, People's Republic of China
Lian-Yi Chen*
Affiliation:
International Center for New-Structured Materials (ICNSM), Zhejiang University, Hangzhou 310027, People's Republic China; and Laboratory of New-Structured Materials, Department of Materials Science and Engineering; Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China
*
b)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Structural origin of the high glass-forming ability (GFA) in multicomponent bulk metallic glasses (BMGs) caused by minor alloying was investigated using state-of-the-art synchrotron radiation techniques. It is found that a two-shell icosahedral cluster with one Y center is the basic structural unit in the representative Cu46Zr42Al7Y5 BMG, which may be densely packed with the help of shared and glue atoms, leading to enhanced ordering at short and medium range. This cluster dense packing may play a key role in achieving the high GFA in CuZrAlY alloy, which also explains the strong dependence of GFA on Y content observed in many experiments. The present work may be extended to a series of multicomponent amorphous alloys, the formation of which is strongly dependent on minor alloying.

Keywords

AmorphousExtended X-ray Absorption Fine Structure (EXAFS)Simulation
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 9 , September 2010 , pp. 1701 - 1705
Copyright
Copyright © Materials Research Society 2010

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