Abstract
The thermal activated relaxation connected with precipitates in a number of alloys always exhibits a broad and asymmetric peak in T-1 plots, which is very different from the Debye-type relaxation peak. Because solute clustering is present around the precipitates, a strong correlation should exist between the motions of solute atoms. Ngai's correlated-state model (1979) is used to simulate the relaxation spectrum. The calculation results not only correlate quite well with the experimental data on the Al-Ag, Ti-H and Ta-H systems but also have profound implications on the mechanism of the internal friction peak.
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