Kinetics of "order-order" Relaxations in Ni_{3}Al Studied by Computer Simulation

• Authors: P. Oramus , R. Kozubski , M. Cadeville , V. Pierron-Bohnes , W. Pfeiler
• Languages of publication: EN

Abstracts

EN

The experimental investigations of "order-order" kinetics in Ni_{3} Al-based L1_{2}-ordered intermetallic compounds revealed the relaxation curves composed of two parallel processes considerably differing in relaxation rates. A simple Ising-type model based on a vacancy mechanism of atomic jumps was used to carry the Monte Carlo simulations of long-range-order relaxations in a binary A_{3}B system with L1_{2}-type superstructure. The simulated relaxation curves fitted weighted sums of two exponentials with significantly different relaxation times. It was found out that the fast relaxation process is controlled by the dynamics of the minority B-atom jumps.

Keywords

EN

05.50.+q; 05.20.Dd; 66.30.-h; 81.30.Hd

Discipline

• 81.30.Hd: Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder
• 05.20.Dd: Kinetic theory(see also 51.10.+y Kinetic and transport theory of gases)
• 05.50.+q: Lattice theory and statistics (Ising, Potts, etc.)(see also 64.60.Cn Order-disorder transformations, and 75.10.Hk Classical spin models)
• 66.30.-h: Diffusion in solids(for surface and interface diffusion, see 68.35.Fx)

• Journal: Acta Physica Polonica A
• Year: 1999
• Volume: 96
• Issue: 1
• Pages: 153-160

Dates

published

1999-07

Contributors

author

P. Oramus

• Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland

author

R. Kozubski

• Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland

author

M. Cadeville

• GEMME, I.P.C.M.S., 23 rue du Loess, 67037 Strasbourg, France

author

V. Pierron-Bohnes

• GEMME, I.P.C.M.S., 23 rue du Loess, 67037 Strasbourg, France

author

W. Pfeiler

• Institut für Materialphysik, Universität Wien, Strudlhofgasse 4, 1090 Wien, Austria

Identifiers

DOI

10.12693/APhysPolA.96.153