[Zurück]

P. Lang, Y.V. Shan, E. Kozeschnik:
"The life-time of structural vacancies in the presence of solute trapping";
Materials Science Forum, 794 - 796 (2014), S. 963 - 970.

Vacancies are the simplest type of lattice defect. However, they play a major role in the kinetics of diffusional processes, such as solid-state precipitation, where mass transport is directly proportional to the concentration of vacancies. We present a physical modelling framework, where we simulate the evolution of excess vacancies on the example of Al-alloys during simplified time-temperature treatments. Interaction energies between solute atoms and vacancies are evaluated by first-principle analysis. Assuming that the escape of vacancies from existing traps is dependent on temperature and binding energies, we explore the life-time of non-equilibrium vacancies and the natural and artificial aging response of Al alloys. The predictions of the model are finally compared to experimental data.

http://dx.doi.org/10.4028/www.scientific.net/MSF.794-796.963

http://publik.tuwien.ac.at/files/PubDat_233409.pdf