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Time-Resolved Small-Angle X-ray Scattering Study of Reversion Kinetics of δ′ Precipitates in an Al - 12AT.% Li Alloy Utilizing Synchrotron Radiation

Published online by Cambridge University Press:  26 February 2011

Haydn Chen ,
M.S. Yu ,
H. Okuda ,
M. Tanaka  and
K. Osamura
Haydn Chen
Affiliation:
Department of Materials Science & Engineering, University of Illinois, Urbana, Illinois 61801, USA
M.S. Yu
Affiliation:
Department of Materials Science & Engineering, University of Illinois, Urbana, Illinois 61801, USA
H. Okuda
Affiliation:
Department of Metallurgy, Kyoto University, Kyoto, Japan
M. Tanaka
Affiliation:
Department of Metallurgy, Kyoto University, Kyoto, Japan
K. Osamura
Affiliation:
Department of Metallurgy, Kyoto University, Kyoto, Japan
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Abstract

Structure change during the reversion process in an Al−12at.%Li alloy above the metastable δ′ solvus was investigated using a time-resolved small-angle x-ray scattering technique with synchrotron radiation. Results showed that the reversion process started after a short incubation time and that the growth of the stable δ phase began before completion of the δ′ dissolution. The radius of gyration of the second phase particles showed little change in the initial stage of reversion, then increased with time, suggesting the presence of diffuse interfaces between the dissolving δ′ particles and the matrix. It is suggested that the undissolved δ′ particles serve as the nuclei of the more stable δ precipitates, which continue to grow with their radii of gyration showing a parabolic power law in the early stage of growth followed by the familiar coarsening kinetics.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 205: Symposium F – Kinetics of Phase Transformations , 1990 , 165
Copyright
Copyright © Materials Research Society 1992

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