Influence of crystallography upon critical nucleus shapes and kinetics of homogeneous f. c. c. -f. c. c. nucleation-III. The influence of elastic strain energy

Journal Article · Mon Oct 01 04:00:00 EDT 1984 · Acta Metall.; (United States)

DOI:https://doi.org/10.1016/0001-6160(84)90242-6· OSTI ID:6060308

Le Goues, F K; Aaronson, H I; Lee, Y W

The influence of crystallography upon critical nucleus shapes and kinetics of homogeneous f.c.c.-f.c.c. nucleation was studied by combining the discrete lattice point non-classical model utilized in paper II of this series with the microscopic theory of strain energy as applied by Cook and de Fontaine to compositional fluctuations in cubic lattices. This permits simultaneous consideration of the influence of anisotropic interfacial energy and anisotropic strain energy upon nucleation. This is extremely difficult to do using other models of strain energy because of mathematical problems. The model is applied to f.c.c. nuclei in Al-Cu and Cu-Co alloys. Nuclei in Al-Cu are plates because coherency strain energy predominates in this system. In Cu-Co alloys, the misfit is smaller and the distortion tensor is cubic; thus the nuclei are essentially spherical. Despite this lesser effect, the influence of strain energy upon the nucleation kinetics of Co-rich precipitates in a Cu-rich Cu-Co alloy is found to be very important, reducing these kinetics by as much as five orders of magnitude.

• Research Organization: Department of Metallurgical Engineering and Materials Science, Carnegie-Mellon University, Pittsburgh, PA
• OSTI ID: 6060308
• Journal Information: Acta Metall.; (United States), Journal Name: Acta Metall.; (United States) Vol. 32:10; ISSN AMETA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ALLOYS
BINARY ALLOY SYSTEMS
COBALT ALLOYS
COPPER ALLOYS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALLOGRAPHY
CRYSTALS
CUBIC LATTICES
ELASTICITY
FCC LATTICES
KINETICS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
MORPHOLOGY
NUCLEATION
PRECIPITATION
REACTION KINETICS
SEPARATION PROCESSES
STRAINS
TENSILE PROPERTIES