Počet záznamů: 1

Modelling of Excess Vacancy Annihilation at Different Types of Sinks

  1. 1.
    0363694 - UFM-A 2012 RIV GB eng J - Článek v odborném periodiku
    Fischer, F. D. - Svoboda, Jiří - Appel, F. - Kozeschnik, E.
    Modelling of Excess Vacancy Annihilation at Different Types of Sinks.
    Acta Materialia. Roč. 59, č. 9 (2011), s. 3463-3472 ISSN 1359-6454
    Grant CEP: GA ČR GAP108/10/1781
    Výzkumný záměr: CEZ:AV0Z20410507
    Klíčová slova: Vacancies * Annihilation * Substitutional diffusion
    Kód oboru RIV: BJ - Termodynamika
    Impakt faktor: 3.755, rok: 2011

    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.
    Trvalý link: http://hdl.handle.net/11104/0199401