Growth of ordered domains in a computer model alloy with lattice misfit

Journal Article · Thu Apr 01 04:00:00 EST 1999 · Journal of Statistical Physics

DOI:https://doi.org/10.1023/A:1004569209618· OSTI ID:6444443

Nielaba, P ^[1]; Fratzl, P ^[2]; Lebowitz, J L ^[3]

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1. Univ. of Mainz (Germany). Inst. for Physics Univ. of Saarland, Saarbruecken (Germany). Inst. for Theoretical Physics
2. Austrian Academy of Sciences and Univ. of Loeben (Austria). Erich Schmid Inst. of Materials Science
3. Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Mathematics

The authors study via Monte Carlo simulations the influence of elastic interactions on the ordering and decomposition of a two-dimensional model binary alloy with antiferromagnetic nearest and ferromagnetic next nearest neighbor type interactions following a quench into the coexistence region. The elastic interaction leads to the development of a platelet morphology for the segregated ordered and disordered regions. A length scale characterizing the coarsening process follows a law of the type R = a + bt[sup 1/3] with the growth b decreasing with the amount of ordered phase; this appears to be due to the presence of anti-phase boundaries between neighboring domains ordered on different sublattices which are difficult to eliminate. The application of uniaxial external stress results in rafting of the domains. Many of the simulation results are in agreement with experimentally observed effects in nickel-base superalloys.

• OSTI ID: 6444443
• Journal Information: Journal of Statistical Physics, Journal Name: Journal of Statistical Physics Vol. 95:1-2; ISSN JSTPBS; ISSN 0022-4715
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOY SYSTEMS
ALLOYS
BINARY ALLOY SYSTEMS
CALCULATION METHODS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
MATERIALS
MICROSTRUCTURE
MONTE CARLO METHOD
NICKEL ALLOYS
NICKEL BASE ALLOYS
ORDER PARAMETERS
PRECIPITATION
SEPARATION PROCESSES