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- W1978476289 endingPage "451" @default.
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- W1978476289 abstract "A review is presented of the relaxation phenomena due to the intrinsic properties of dislocations. The Bordoni peaks of internal friction were first observed in f.c.c. metals. Their essential features (primary and secondary characteristics) have been deduced from the ensemble of experimental results in the literature. The stability of these peaks during annealing after cold work strongly suggests that the Bordoni relaxation is linked to the intrinsic properties of dislocations. Thus, we present the principal theoretical models proposed to explain intrinsic dislocation relaxations. There are: the relaxation models based upon the thermally-activated generation of double-links, models based upon the migration of dislocation dipoles and jogs. A detailed comparison of the predictions of these models with the published experimental results leads us to the conclusion that the double-kink relaxation model is the most suitable. The experimental results obtained on deformed h.c.p. and b.c.c. metals, ionic and covalent crystal-line materials are also reviewed. In these materials there are many relaxation phenomena attributed to dislocations, and there is a good deal of variability in the results reported from one laboratory to another. A coherent picture appears to be emerging in the case of h.c.p. and b.c.c. metals; but at present, it is difficult to attribute a precise mechanism to each internal friction peak. In addition, studies are reviewed of microplasticity in the temperature range of the Bordoni relaxation. A correlation between the mechanisms of microplasticity and internal friction is demonstrated. This analysis yields an estimate of the Peierls stress in f.c.c. metals of about 10−4 μ." @default.
- W1978476289 created "2016-06-24" @default.
- W1978476289 creator A5001395088 @default.
- W1978476289 creator A5013443095 @default.
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- W1978476289 creator A5062401209 @default.
- W1978476289 date "1982-01-01" @default.
- W1978476289 modified "2023-10-01" @default.
- W1978476289 title "Internal friction and microdeformation due to the intrinsic properties of dislocations: The Bordoni relaxation" @default.
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