Ostwald ripening in multicomponent alloys

Journal Article · Fri Oct 15 04:00:00 EDT 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90191-T· OSTI ID:6256105

Umantsev, A; Olson, G B ^[1]

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1. Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering

The widespread use of second-phase dispersions in materials has stimulated the intensive study of the diffusion processes occurring in them at the last stage of a first-order phase transformation, termed Ostwald ripening or coarsening. As a result of the large surface area, the mixture is not in thermodynamic equilibrium. Relaxation of such a system is characterized by an increase in the scale size of the second phase and a decrease in the total energy. The authors analyze the coarsening process of an ensemble of particles, precipitation from a multicomponent alloy of arbitrary composition. The authors utilize the method of expansion of chemical potentials, which enables us to describe the coarsening rate through partial derivatives of the chemical potential, with respect to the mole fractions of different components. The latter can be easily calculated numerically, with the help of modern computer database programs such as ThermoCalc. The multicomponent interactions for diffusion are not considered, which implies rather special properties of the matrix of mobility coefficients.

• OSTI ID: 6256105
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 29:8; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOY SYSTEMS
ALLOYS
MATHEMATICAL MODELS
PHASE TRANSFORMATIONS
PRECIPITATION
SEPARATION PROCESSES