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Ni-based bulk amorphous alloys in the Ni–Ti–Zr–(Si, Sn) system

Published online by Cambridge University Press:  31 January 2011

S. Yi ,
T. G. Park  and
D. H. Kim
S. Yi
Affiliation:
Center for Noncrystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul, Korea
T. G. Park
Affiliation:
Center for Noncrystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul, Korea
D. H. Kim
Affiliation:
Center for Noncrystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul, Korea
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Abstract

New Ni-based bulk amorphous alloys in the alloy system Ni–Ti–Zr–(Si,Sn) were developed through systematic alloy design based upon the empirical rules for high glass forming alloys. Small additions of Si and/or Sn significantly improved the glass forming ability (GFA) of the alloys Ni57Ti23−xZr20 (Si,Sn)x leading to a Ni-based bulk amorphous alloy. The amorphous ribbons of the alloys Ni57Ti23−xZr20 (Si,Sn)x exhibited very high glass transition temperatures (Tg > 823 K), crystallization temperatures (Tx > 883 K), and large undercooled liquid regions (δTx > 50 K) implying the high GFA of the alloys. Fully amorphous rods with the diameter of up to 2 mm can be fabricated by a copper mold casting method. Development of the new Ni-based bulk amorphous alloys having high Tg,Tx, and δTx expands the practical applications of amorphous alloys as structural materials.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 11 , November 2000 , pp. 2425 - 2430
Copyright
Copyright © Materials Research Society 2000

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