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Structural Study of Fe-Based Glassy Alloys with a Large Supercooled Liquid Region

Published online by Cambridge University Press:  17 March 2011

M. Imafuku ,
S. Sato ,
T. Nakamura ,
H. Koshiba ,
E. Matsubara  and
A. Inoue
M. Imafuku
Affiliation:
Inoue Superliquid Glass Project, ERATO, Sendai 982-0807, JAPAN
S. Sato
Affiliation:
Inoue Superliquid Glass Project, ERATO, Sendai 982-0807, JAPAN
T. Nakamura
Affiliation:
Institute for Advanced Materials Processing, Tohoku University, Sendai 980-8577, JAPAN
H. Koshiba
Affiliation:
Alps Electric Co, Nagaoka 940-8572, JAPAN
E. Matsubara
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, JAPAN
A. Inoue
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, JAPAN
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Abstract

The thermal stability and local atomic structures of glassy Fe70M10B20 (M = Hf, Zr, Nb, W and Cr) alloys were analyzed by DSC, ordinary X-ray diffraction and AXS measurements. The random network of the trigonal prism-like structure of (Fe,M)3B with edge-sharing, was identified in all the Fe70M10B20 (M = Hf, Zr, Nb, W and Cr) alloys in spite of the wide variety of thermal stability upon heating. Several unique primary precipitated crystalline phases, such as Fe23B6 type and Fe-M phases, were observed in the alloys exhibiting a high thermal stability. These crystallization reactions require relatively long range rearrangements of the constituents and hence the thermal stability of the glassy phase increases, leading to the appearance of a large supercooled liquid region upon heating. These phenomena may be originated from the difference in the chemical affinity and the atomic size mismatch between M and Fe or B.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 644: Symposium L – Supercooled Liquid, Bulk Glassy and Nanocrystalline State of Alloys , 2000 , L1.6
Copyright
Copyright © Materials Research Society 2001

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