期刊
ACTA MATERIALIA
卷 59, 期 9, 页码 3463-3472出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2011.02.020
关键词
Vacancies; Annihilation; Substitutional diffusion; Modeling; Thermodynamic extremal principle
资金
- Austrian Federal Government
- Styrian Provincial Government
- Steirische Wirtschafts-forderungsgesellschaft mbH
- DFG [AB.314/1 (FOR 741)]
- Czech Science Foundation [P108/10/1781]
- Research Plan of the Institute of Physics of Materials [CEZ:AV0Z20410507]
The equilibrium site fraction of vacancies increases with temperature and, thus, annealing and rapid quenching may lead to states with a significant vacancy supersaturation. Excess vacancies can then gradually annihilate at available sinks represented by jogs at dislocations, by grain boundaries or free surfaces. Significant supersaturation by vacancies may also lead to the nucleation and growth of Frank loops acting as additional sinks. Three models corresponding to three different annihilation mechanisms are developed in this paper. They refer to annihilation of excess vacancies at jogs at dislocation with a constant density, at homogeneously distributed Frank loops with a constant density and at grain boundaries. The simulations based on the models are performed for individual annihilation mechanisms under isothermal and non-isothermal conditions as well as for simultaneous annihilation of vacancies at Frank loops and dislocation jogs and grain boundaries using different cooling conditions. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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