Shôsuke Imoto1 and Genjiro Mima1
1Faculty of Engineering, Osaka University,
The internal friction of annealed copper specimens containing oxygen showed a maximum on increasing the strain amplitude. The position of the maximum changed with the heat-treatment of the specimen ; the lower the temperature of annealing, the further towards the lower amplitude is displaced the maximum. It was supposed that the shift of the maximum to lower amplitude was owing to the lower solubility of the impurities at lower temperature. An interpretation was tried by using the dislocation theory of A. Granato and K. Lücke. The theory could explain the existence of a maximum in the internal friction-amplitude curve and the shift of the maximum to lower amplitude in purer specimens.
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