Growth and coarsening of g. p. Zones in Al- Zn alloys |
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Authors: | Kozo Osamura Hiroshi Okuda Yoshiyuki Amemiya Hiroo Hashizume |
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Affiliation: | (1) Department of Metallurgy, Kyoto University, 606 Sakyo-ku, Kyoto, Japan;(2) Photon Factory, National Laboratory for High Energy Physics of Japan, USA;(3) Research Laboratory of Engineering Materials, Tokyo Institute of Technology, USA |
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Abstract: | The structural changes during the precipitation of G. P. zones in Al-Zn binary alloys have been investigated by means of anin situ small-angle scattering technique using synchrotron radiation. Defining a specific time, normalized by the half-completion
time, the time-dependent evolution of the precipitation process can be divided into three periods, independent of alloy composition
and quench-ing conditions. The structural and kinetic features of the first two periods have been analyzed in detail. The
first stage represents a growing process of clusters with diffuse interface into the well-defined G. P. zones. The average
size of these clusters increases, and the density decreases. The second stage corresponds to the Ostwald ripening process.
This mechanism is described by utilizing a modified Lifshitz-Slyozov-Wagner theory. |
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