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

Abstract

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.

Authors:
;
Publication Date:
Research Org.:
Pennsylvania State Univ., University Park, PA (US)
OSTI Identifier:
20075986
Resource Type:
Journal Article
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 42; Journal Issue: 10; Other Information: PBD: 10 May 2000; Journal ID: ISSN 1359-6462
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MICROSTRUCTURE; ALUMINIUM ALLOYS; LITHIUM ALLOYS; PRECIPITATION; COMPUTERIZED SIMULATION; KINETICS; GRAIN GROWTH

Citation Formats

Vaithyanathan, V., and Chen, L.Q. Coarsening kinetics of {delta}{prime}-Al{sub 3}Li precipitates: Phase-field simulation in 2D and 3D. United States: N. p., 2000. Web. doi:10.1016/S1359-6462(00)00323-7.
Vaithyanathan, V., & Chen, L.Q. Coarsening kinetics of {delta}{prime}-Al{sub 3}Li precipitates: Phase-field simulation in 2D and 3D. United States. doi:10.1016/S1359-6462(00)00323-7.
Vaithyanathan, V., and Chen, L.Q. Wed . "Coarsening kinetics of {delta}{prime}-Al{sub 3}Li precipitates: Phase-field simulation in 2D and 3D". United States. doi:10.1016/S1359-6462(00)00323-7.
@article{osti_20075986,
title = {Coarsening kinetics of {delta}{prime}-Al{sub 3}Li precipitates: Phase-field simulation in 2D and 3D},
author = {Vaithyanathan, V. and Chen, L.Q.},
abstractNote = {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.},
doi = {10.1016/S1359-6462(00)00323-7},
journal = {Scripta Materialia},
issn = {1359-6462},
number = 10,
volume = 42,
place = {United States},
year = {2000},
month = {5}
}