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In-Situ Electron Diffraction Study of Structural Change in the Super-Cooled Liquid Region in Amorphous La-Al-Ni Alloy

Published online by Cambridge University Press:  10 February 2011

T. Ohkubo ,
T. Hiroshima ,
Y. Hirotsu ,
S. Ochiai  and
A. Inoue
T. Ohkubo
Affiliation:
Institute of Science and Industrial Research, Osaka University, 567–0047, Japan
T. Hiroshima
Affiliation:
Institute of Science and Industrial Research, Osaka University, 567–0047, Japan
Y. Hirotsu
Affiliation:
Institute of Science and Industrial Research, Osaka University, 567–0047, Japan
S. Ochiai
Affiliation:
Teikyo University of Science and Technology, Yamanashi, 409–0193, Japan
A. Inoue
Affiliation:
Institute of Materials Research, Tohoku University, Sendai, 980–8577, Japan
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Abstract

Atomic structures of an amorphous La55A125Ni20 alloy in the supercooled liquid state have been investigated by in-situ electron diffraction using a specimen-heating stage in TEM and the imaging-plate intensity recording. From the analysis of atomic pair distribution functions, changes in interatomic distances and coordination numbers were clearly observed at temperatures in the supercooled liquid state. From the reverse Monte Carlo simulations, structural units (icosahedral, Archimedean anti-prism and trigonal prism atomic clusters) typical of the metallic glass structure were found and increased in the supercooled liquid region. In addition, the deformation behavior was investigated using tensile test. The superplastic elongation was confirmed at optimum strain rates in the supercooled liquid region. From the TEM observation of tensile tested specimens with superplastic elongation, β-La (fcc) nano precipitates in the amorphous matrix were confirmed. The superplasticity in this alloy is thought to originate in viscous flow due to the glassy structure formation but is closely related to an additional flow mode with the microcrystalline precipitation from the amorphous state during the deformation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 554: Symposium MM – Bulk Metallic Glasses , 1998 , 69
Copyright
Copyright © Materials Research Society 1999

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