期刊
COMPUTATIONAL MATERIALS SCIENCE
卷 60, 期 -, 页码 59-65出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.commatsci.2012.02.033
关键词
Fe-Cu alloy; Coalescence; Monte Carlo simulation; Precipitation kinetics; Growth kinetics
资金
- Austrian Science Fund (FWF) within the ViCoM [F41]
- Austrian Federal Government
- Styrian Provincial Government
The influence of vacancy preference towards one of the constituents in a binary system on the formation of precipitates was investigated by atomistic and continuums modeling techniques. In case of vacancy preference towards the solute atoms, we find that the mobility of individual clusters as well as entire atom clusters is significantly altered compared to the case of vacancy preference towards the solvent atoms. The increased cluster mobility leads to pronounced cluster collisions, providing a precipitate growth and coarsening mechanism competitive to that of pure solute evaporation and adsorption considered in conventional diffusional growth and Ostwald ripening. A modification of a numerical Kampmann-Wagner type continuum model for precipitate growth is proposed, which incorporates the influence of both mechanisms. The prognoses of the modified model are validated against the growth laws obtained with lattice Monte Carlo simulations and a growth simulation considering solely the coalescence mechanism. (C) 2012 Elsevier B. V. All rights reserved.
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