期刊
ACTA MATERIALIA
卷 60, 期 16, 页码 5803-5817出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2012.07.021
关键词
Metal & alloys; Coarsening; Kinetics; Transmission electron microscopy; Statistical mechanics
资金
- National Science Foundation, Washington, DC [DMR-0710484]
- Florida 21st Century Scholar Program
Experimental characterization of microstructure evolution in three binary Al-Li alloys provides critical tests of both diffusion screening theory and multiparticle diffusion simulations, which predict late-stage phase-coarsening kinetics. Particle size distributions, growth kinetics and maximum particle sizes obtained using quantitative, centered dark-field transmission electron microscopy are compared quantitatively with theoretical and computational predictions. We also demonstrate the dependence on delta' precipitate volume fraction of the rate constant for coarsening and the microstructure's maximum particle size, both of which remained undetermined for this alloy system for nearly a half century. Our experiments show quantitatively that the diffusion-screening theoretical description of phase coarsening yields reasonable kinetic predictions, and that useful simulations of microstructure evolution are obtained via multiparticle diffusion. The tested theory and simulation method will provide useful tools for future design of two-phase alloys for elevated temperature applications. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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