Abstract:
The interpretation of the Bordoni relaxation and of related relaxation phenomena in terms of the thermally activated, stress-assisted formation of kink pairs on dislocation lines is well established on assuming that the migration of kinks along dislocation lines is described by a high kink mobility μ k . This assumption, however, is not valid if the activation enthalpy for kink migration, H m , is comparable with or even larger than the formation enthalpy of kink pairs or if even when small compared with the formation energy of kinks, H m is larger than the lowest thermal energies accessible in internal friction experiments. In those cases not only migration but also annihilation and trapping of thermal kink pairs may produce internal friction peaks. The difference-differential equations governing the thermal kink pairs evolution along dislocation lines under the action of a homogeneous applied shear stress are set up and their time-dependent solutions characterized by a set of relaxation times. It is shown how to obtain, from these solutions, the internal friction spectrum under conditions that are experimentally realized. Quantitative descriptions of geometrical kink migration and kink pair evolution are compared with selected experimental results.
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Documento: |
Artículo
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Título: | Dislocation relaxation processes due to kink migration |
Autor: | Hermida, E.B.; Seeger, A.; Ulfert, W. |
Filiación: | Max-Planck Inst. F. Metallforschung, Universität Stuttgart, Inst. F. Theor. und Angew. Physik, 70569 Stuttgart, Germany Unidad Act. Materiales, Comn. Nac. de Ener. Atómica, Av. del Libertador 8250, 1429 Buenos Aires, Argentina Dto. de Física, Fac. de Ciencias Exactas y Naturales, Ciudad Universitaria, 1428 Buenos Aires, Argentina
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Palabras clave: | Differential equations; Dislocations (crystals); Enthalpy; Internal friction; Relaxation processes; Shear stress; Activation enthalpy; Bordoni relaxation; Kink migration; Kink mobility; Kink pair formation; Thermal kink; Metals |
Año: | 1996
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Volumen: | 6
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Número: | 8
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Página de inicio: | C8
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Página de fin: | 175-C8-178
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Título revista: | Journal De Physique. IV : JP
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Título revista abreviado: | J Phy IV JP
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ISSN: | 11554339
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CODEN: | JPICE
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11554339_v6_n8_pC8_Hermida |
Referencias:
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Citas:
---------- APA ----------
Hermida, E.B., Seeger, A. & Ulfert, W.
(1996)
. Dislocation relaxation processes due to kink migration. Journal De Physique. IV : JP, 6(8), C8-175-C8-178.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11554339_v6_n8_pC8_Hermida [ ]
---------- CHICAGO ----------
Hermida, E.B., Seeger, A., Ulfert, W.
"Dislocation relaxation processes due to kink migration"
. Journal De Physique. IV : JP 6, no. 8
(1996) : C8-175-C8-178.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11554339_v6_n8_pC8_Hermida [ ]
---------- MLA ----------
Hermida, E.B., Seeger, A., Ulfert, W.
"Dislocation relaxation processes due to kink migration"
. Journal De Physique. IV : JP, vol. 6, no. 8, 1996, pp. C8-175-C8-178.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11554339_v6_n8_pC8_Hermida [ ]
---------- VANCOUVER ----------
Hermida, E.B., Seeger, A., Ulfert, W. Dislocation relaxation processes due to kink migration. J Phy IV JP. 1996;6(8):C8-175-C8-178.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11554339_v6_n8_pC8_Hermida [ ]