Reordering kinetics of ion-disordered Ni3Al
Institut für Materialphysik und SFB 345 der Universität Göttingen,
Hospitalstrasse 3-7, 37073 Göttingen, Germany
Revised: 23 June 2000
Published online: 15 October 2000
A study of the reordering kinetics of ion-irradiated Ni3Al is presented. The development of long-range order during annealing treatments is measured by quantitative electron diffractometry. According to the temperature dependence of the observed kinetics, the reaction is dominated by non-equilibrium vacancies. As a consequence, the kinetics can be calibrated versus the absolute number of atomic jumps necessary to establish the observed degree of order. In order to analyse the experimental data, Monte Carlo simulations are performed. It is shown that, beside the temperature dependence of the driving force, the ordering efficiency of the vacancy jumps itself is temperature dependent due to different mobilities of the atomic species.
PACS: 81.30.Hd – Constant-composition solid-solid phase transformations: polymorphic, massive, and order disorder / 64.60.Cn – Order-disorder transformations; statistical mechanics of model systems / 02.70.Lq – Monte Carlo and statistical methods / 61.80.Jh – Ion radiation effects
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000