Počet záznamů: 1  

Modelling of grain refinement driven by negative grain boundary energy

  1. 1. 0476921 - UFM-A 2018 RIV CZ eng J - Článek v odborném periodiku
    Fischer, F. D. - Zickler, G. A. - Svoboda, Jiří
    Modelling of grain refinement driven by negative grain boundary energy.
    Philosophical Magazine. Roč. 97, č. 23 (2017), s. 1963-1977. ISSN 1478-6435
    Grant CEP: GA ČR(CZ) GA15-06390S
    Institucionální podpora: RVO:68081723
    Klíčová slova: grain refinement * grain nucleation * distribution concept * jump on distribution function
    Kód oboru RIV: BJ - Termodynamika
    Obor OECD: Thermodynamics
    Impakt faktor: 1.632, rok: 2017

    Grain refinement can be described by the classical kinetic equation using a negative value of the specific grain boundary Gibbs energy. A respective overview is offered reporting according observations and simulations, particularly linked to grain boundary segregation. Classical grain growth model is used in the treatment of evolution of the distribution function during refinement. The adapted model requires defining nucleation rate of new grains, which significantly influences the kinetics of the system of grains. Moreover, a jump in the distribution function is allowed at a certain value of the grain radius R-J, which separates old grains from newly nucleated ones. Evolution equation for both the critical radius R-c and separation radius R-J (jump position) as well as for the dimension-free distribution (shape) function are derived. Illustrative examples for the evolution of the system parameters under various nucleation rates of newly generated grains are presented.
    Trvalý link: http://hdl.handle.net/11104/0273472