Abstract
Elastic effects by cubic-tetragonal symmetry breaking on the ordering kinetics are investigated. We propose a coarse-grained model characterized by a Ginzburg-Landau free energy with non-conserved order parameters coupled to an elastic field. By numerical study we obtain an oval shaped domain and a square domain in two dimensions and a plate-like domain and a rod-like domain in three dimensions. And in the coarsening process, a striped pattern is obtained. These patterns are remarkably similar to morphologies observed in real cubic-tetragonal order-disorder alloys. Moreover, we study the dynamics during the coarsening process by analyzing the change of the total domain boundaries LDB(t). LDB(t) decreases as a power of time: t-α(α > 0). The exponent a becomes small with increasing the magnitude of the elastic effects.
Original language | English |
---|---|
Pages (from-to) | 2628-2637 |
Number of pages | 10 |
Journal | journal of the physical society of japan |
Volume | 66 |
Issue number | 9 |
DOIs | |
Publication status | Published - 1997 Sep |
Externally published | Yes |
Keywords
- Coarsening process
- Cubic-tetragonal symmetry breaking
- Elastic effect
- Morphologies
- Pattern formation
- Simulation
ASJC Scopus subject areas
- Physics and Astronomy(all)