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To study the damping mechanism of dislocation relaxations in aluminum, internal friction of a high purity aluminum crystal was measured for the frequency of 50kHz at the temperatures between 2 and 240K. There were three temperature regions of dislocation peaks, i.e. the Bordoni relaxation (Bordoni peak around 180K and Niblett–Wilks peak around 120K), Lax–Filson peak around 35K, and the 11K peak. The...
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