Abstract
Since the early work on grain boundary relaxation by Kě in 1947, the grain boundary internal friction peaks were mostly measured by the free decay method as a function of temperature. The validity of this procedure is based on the assumption that the grain boundary relaxation. as a rate process, should obey the Arrhenius relationship. In this paper, the grain boundary internal friction peaks in polycrystalline aluminum and aluminum bicrystal were measured both as a function of frequency and as a function of temperature by the forced vibration method. The results showed that the frequency spectrum is in correspondence with the temperature spectrum and the Arrhenius relationship holds for grain boundary relaxation within a wide frequency range.
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