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Formation of Zr70Ni23Ti7 Glassy Alloy and Phase Transformation upon Annealing

Published online by Cambridge University Press:  31 January 2011

Limin Wang ,
Chunfei Li ,
Liqun Ma  and
Akihisa Inoue
Limin Wang*
Affiliation:
Inoue Superliquid Glass Project, ERATO, JST, Sendai 982–0807, Japan
Chunfei Li
Affiliation:
Inoue Superliquid Glass Project, ERATO, JST, Sendai 982–0807, Japan
Liqun Ma
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980–8577, Japan
Akihisa Inoue
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980–8577, Japan
*
a)Address all correspondence to this author. e-mail: wang@sendai.jst.go.jp
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Abstract

Zr70Ni23Ti7 alloy contains a single amorphous phase when it is melt-spun at a wheel surface velocity over 20 m/s. The crystallization of these amorphous ribbons takes place through two exothermic reactions and shows a significant supercooled liquid region of about 30 K, indicating that the Zr70Ni23Ti7 alloy has a good glass-forming ability. The crystallization products of the first exothermic reaction for the ribbon prepared at a wheel surface velocity of 40 m/s are mainly an icosahedral quasicrystalline phase (I-phase) and some Zr2Ni phases. Further heating to a higher temperature will lead to the transformation of the metastable I-phase to Zr2Ni. Some icosahedral atomic clusters with a structure similar to those in face-centered-cubic Zr2Ni may exist in the alloy after rapid quenching, and most of them may act as nuclei of I-phase. The formation of I-phase in this alloy without any noble metals may be due to the proper atomic ratios in the system.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 3 , March 2002 , pp. 693 - 696
Copyright
Copyright © Materials Research Society 2002

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