Coarsening kinetics of {delta}{prime}-Al{sub 3}Li precipitates: Phase-field simulation in 2D and 3D

Journal Article · Wed May 10 04:00:00 EDT 2000 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(00)00323-7· OSTI ID:20075986

Vaithyanathan, V; Chen, L Q

To reduce the number of approximations and relax some of the assumptions made in analytical theories, there has been an increasing number of numerical computational studies of coarsening processes. Most of the existing simulation studies were performed in 2D and only a few of them in 3D. For the particular case of Al-Li alloys, recently, the authors employed the microscopic field model to study the morphological evolution and coarsening kinetics of {delta}{prime} precipitates. Even though computer simulations using microscopic field approach were performed in projected 2D systems, many aspects of the simulation results including volume fraction dependence of precipitate morphology and coarsening rates show at least qualitative agreement with existing experimental measurements. The main purpose of this paper is to compare the similarities and differences between coarsening kinetics obtained in 2D and 3D computer simulations. For this purpose, the authors chose a 20% volume fraction system and employed the continuum diffuse-interface phase-field approach which has been extensively used in modeling microstructure evolution during phase transformation and its coarsening. Al-Li system with {delta}{prime} precipitates is considered because of the small lattice mismatch between precipitate and matrix, eliminating the need for considering the effect of elastic energy on coarsening.

• Research Organization: Pennsylvania State Univ., University Park, PA (US)
• OSTI ID: 20075986
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 10 Vol. 42; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
COMPUTERIZED SIMULATION
GRAIN GROWTH
KINETICS
LITHIUM ALLOYS
MICROSTRUCTURE
PRECIPITATION