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Chemically and Mechanically Driven Creep Due to Generation and Annihilation of Vacancies with Non-ideal Sources and Sinks
- 1.0363691 - ÚFM 2012 RIV US eng J - Journal Article
Fischer, F. D. - Svoboda, Jiří
Chemically and Mechanically Driven Creep Due to Generation and Annihilation of Vacancies with Non-ideal Sources and Sinks.
International Journal of Plasticity. Roč. 27, č. 9 (2011), s. 1384-1390. ISSN 0749-6419. E-ISSN 1879-2154
R&D Projects: GA ČR GAP204/10/1784
Institutional research plan: CEZ:AV0Z20410507
Keywords : Creep * Stress relaxation * Crystal plasticity
Subject RIV: BJ - Thermodynamics
Impact factor: 4.603, year: 2011
The classical concept of Nabarro creep is extended for a general dislocation microstructure. The specific mechanism of the creep consists in generation and annihilation of vacancies at dislocation jogs acting as non-ideal sources and sinks for vacancies. This mechanism causes the climb of dislocations, allowing for local volume and shape change. The final kinetic equations, relating the dislocation microstructure and the local stress state to the creep rate, are derived by means of the thermodynamic extremal principle. Closed-form equations for the creep rate are derived for isotropic polycrystals. Based on the model the creep rate in the ferritic P-91 type steel at very low applied stress is evaluated and compared with experiment.
Permanent Link: http://hdl.handle.net/11104/0199399
Number of the records: 1