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- W2016024853 abstract "Since the introduction of the by J.S. Koehler and its subsequent elaboration by K. Lucke, A. Granato and others, the pinning concept has been used extensively in the interpretation of internal friction experiments involving dislocations. The ongoing refinements of the experiments have made it highly desirable to put the intuitive pinned-string model on a firmer theoretical basis. to delineate its limitations, and to replace it by more general or better founded concepts where necessary. Among them is the idea that at low temperatures the movement of dislocations should be described in terms of the stress-assisted generation of kink pairs and the drift of kinks along the dislocation lines (in the case of screw dislocations in refractory bcc metals up to temperatures well above room temperature), and the realization that -, as a rule - the range of the interaction between atomic defects (foreign atoms, self-interstitials, vacancies) and dislocations exceeds considerably the extension of the dislocation cores. The physical basis and the general features of a theory allowing for the above-mentioned generalizations will be outlined. The theory is necessarily more complicated than the pinned-string model but covers a much wider range of phenomena. It possesses a higher predictive power and may therefore be subjected to. more stringent experimental tests. Over the last few years a number of special cases have been worked out by T. Ogurtani and the author. For some selected examples results will be quoted and compared with experiments." @default.
- W2016024853 created "2016-06-24" @default.
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- W2016024853 date "1987-12-01" @default.
- W2016024853 modified "2023-10-18" @default.
- W2016024853 title "A PHYSICAL PICTURE FOR THE INTERNAL FRICTION DUE TO DISLOCATIONS AND ATOMIC-DEFECT - DISLOCATION INTERACTIONS" @default.
- W2016024853 doi "https://doi.org/10.1051/jphyscol:1987806" @default.
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