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Investigation of the stability of glassy state in the Zr- and Hf-based glassy alloys correlated with their transformation behavior

Published online by Cambridge University Press:  31 January 2011

Junji Saida ,
Chunfei Li ,
Mitsuhide Matsushita  and
Akihisa Inoue
Junji Saida*
Affiliation:
Inoue Superliquid Glass Project, ERATO, Japan Science and Technology Corporation (JST), Yagiyamaminami 2-1-1, Sendai 982–0807, Japan
Chunfei Li
Affiliation:
Inoue Superliquid Glass Project, ERATO, Japan Science and Technology Corporation (JST), Yagiyamaminami 2-1-1, Sendai 982–0807, Japan
Mitsuhide Matsushita
Affiliation:
JEOL Ltd., Akishima, Tokyo 196–8558, Japan
Akihisa Inoue
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980–8577, Japan
*
a)Address all correspondence to this author. e-mail: jsaida@sendai.jst.go.jp
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Abstract

The transformation behavior from glassy state was investigated in Zr- and Hf-based glassy alloys. The primary phases are metastable face-centered-cubic (fcc) Zr2Ni and fcc Hf2Ni phases in the Zr65Al7.5Ni10Cu17.5 and Hf65Al7.5Ni10Cu17.5 glassy alloys, respectively. By substitution of 5 at.% Pd for Cu, the primary phase changes to an icosahedral quasicrystalline phase in both alloys. It is found that the addition of elements, which have a positive or weak chemical affinity with one of the constitutional elements in the Zr–Al–Ni–Cu and Hf–Al–Ni–Cu glassy alloys, is effective for the precipitation of the icosahedral phase. It is suggested that Pd plays a dominant role in an increase in the number of nucleation sites. Since an icosahedron is contained as a structure unit in the icosahedral, fcc Zr2Ni and fcc Hf2Ni phases, it is implied that these phases are correlated with the local icosahedral order. The high-resolution transmission electron microscopy images of the as-spun Zr65Al7.5Ni10Cu7.5Pd10 and Hf65Al7.5Ni10Cu12.5Pd5 alloys reveal a possibility of the existence of the icosahedral ordered regions. It is therefore, concluded that the icosahedral short- or medium-range order exists and it stabilizes the glassy state in the Zr- and Hf-based multicomponent alloys.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 12 , December 2001 , pp. 3389 - 3401
Copyright
Copyright © Materials Research Society 2001

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