Masanori Tanaka1, Hiroshi Okuda1, Kozo Osamura1 and Yoshiyuki Amemiya2
1Department of Metallurgy, Faculty of Engineering, Kyoto University, Kyoto
The reversion process of δ′ pricipitates of an Al--7.94 mol%Li binary alloy has been investigated by means of in-situ synchrotron radiation small-angle scattering measurements. The Guinier radius and the integrated intensity decreased monotonically in this alloy, whereas the radius increased in the Al--Zn binary alloys.
Assuming that the origin of the difference in the time evolution of the Guinier radius is the difference in the rate-determining process, the kinetics of reversion has been analyzed in terms of the reaction rate controlled process at the precipitate interface. The kinetic equation for the integrated intensity agreed with the experimental results.
(Received June 11, 1992)
aluminum--lithium alloy, delta prime precipitates, reversion kinetics, synchrotron radiation small-angle scattering
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