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Glass to Icosahedral Phase Transformation in Zr-based Glassy Metals

Published online by Cambridge University Press:  21 March 2011

Osami Haruyama ,
Tomoaki Miyazawa ,
Junji Saida  and
Akihisa Inoue
Osami Haruyama
Affiliation:
Department of Physics, Science University of Tokyo, Noda 278-8510, JAPAN
Tomoaki Miyazawa
Affiliation:
Department of Physics, Science University of Tokyo, Noda 278-8510, JAPAN
Junji Saida
Affiliation:
Japan Science and Technology Co, Inoue Superliquid Glass Project, Sendai 982-0807, JAPAN
Akihisa Inoue
Affiliation:
Institute for Material Research, Tohoku University, Sendai 980-8577, JAPAN
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Abstract

Electrical properties of icosahedral phases (I-phase) that precipitated in Zr65Al7.5Cu7.5Ni10M10 (M=Ag, Pd), Zr65Al7.5Cu1.25Ni10M5 (M=Ag, Pd), Zr65Pd25Ni10 and Zr70Pd20Ni10 metallic glasses have been investigated. In-situ resistivity change with increasing temperature was measured at a heating rate of 0.67 K/s from room temperature. I-phase transformation was occurred in the supercooled liquid phase for Zr-Al-Cu-Ni-M glasses, followed by the crystallization to stable Zr2Ni- and Zr2Cu-type crystals. Ternary glasses exhibited the I-phase crystallization from the glass solid phase and subsequently the transformation of I-phase to crystal phases like Zr2Ni and Zr2Pd. The resistivity of I-phase decreased together with advancing I-phase precipitation, about 2 % compared to the resistivity of the supercooled liquid phase, for typical Zr65Al7.5Cu7.5Ni10Ag10 glass. On the other hand, Zr70Pd20Ni10 glass showed the resistivity increment of about 5 % just after completing I-phase crystallization. Low temperature conductivity of Zr65Al7.5Cu7.5Ni10Ag10 and Zr70Pd20Ni10 glasses and I-phases may be explained by the weak localization model of conduction electron in the range from about 20 K to room temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 676: Symposium Y – Synthesis, Functional Properties and Applications of Nanostructures , 2001 , Y3.39
Copyright
Copyright © Materials Research Society 2001

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