Volume 52, Number 2, October II 2000
|Page(s)||224 - 230|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 September 2002|
Dynamics of mesoscopic precipitate lattices in phase-separating alloys under external load
Institut für Materialphysik der Universität Wien
Strudlhofgasse 4, A-1090 Wien, Austria
2 Departments of Mathematics and Physics, Rutgers University, Busch Campus New Brunswick, 08903 NJ, USA
3 Erich Schmid Institut für Materialwissenschaft Österreichische Akademie der Wissenschaften & Institut für Metallphysik Montanuniversität Leoben - Jahnstraße 12, A-8700 Leoben, Austria
Accepted: 24 August 2000
We investigate, via three-dimensional atomistic computer simulations, phase separation in an alloy under external load. A regular two-dimensional array of cylindrical precipitates, forming a mesoscopic precipitate lattice, evolves in the case of applied tensile stress by the movement of mesoscopic lattice defects. A striking similarity to ordinary crystals is found in the movement of “meso-dislocations", but new mechanisms are also observed. Point defects such as “meso-vacancies" or “meso-interstitials" are created or annihilated locally by merging and splitting of precipitates. When the system is subjected to compressive stress, we observe stacking faults in the mesoscopic one-dimensional array of plate-like precipitates.
PACS: 81.30.Mh – Solid-phase precipitation / 64.75.+g – Solubility, segregation, and mixing; phase separation / 02.70.Lq – Monte Carlo and statistical methods
© EDP Sciences, 2000
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