The influence of vacancies upon the internal friction of polycrystalline copper
- 1 May 1958
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 3 (29) , 519-526
- https://doi.org/10.1080/14786435808244576
Abstract
Neutron irradiation, gamma irradiation and quenching all change the internal friction of pure polycrystalline rods of copper. Only if the rods are initially given an anneal near the melting point for many hours do these three treatments give consistent and similar results, and then the logarithmic decrement is reduced. It is concluded from the results that it is the vacancies introduced by each of the three treatments which pin the dislocation lines by diffusing to them, and that unless the purity of the copper is high their effect can be obscured.Keywords
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