Accession Number : AD0696954
Title : EFFECTS OF GROWTH MECHANISM ON SOLUTION KINETICS.
Descriptive Note : Technical rept.,
Corporate Author : DREXEL INST OF TECH PHILADELPHIA PA DEPT OF METALLURGICAL ENGINEERING
Personal Author(s) : Tanzilli,Richard A. ; Heckel,Richard W.
Report Date : OCT 1969
Pagination or Media Count : 21
Abstract : The solution kinetics of second phases were studied as a function of various initial conditions resulting from either diffusion-controlled growth or interface-reaction-controlled growth prior to solution treatment. Calculations of solution kinetics based upon a planar, finite-geometry model were carried out using numerical methods and computer techniques. It was shown that second-phase particles formed by diffusion-controlled growth and existing in a matrix containing concentration gradients exhibit dissolution kinetics that differ markedly from those of particles formed by interface-reaction-controlled growth. An experimental analysis designed to use solution kinetics measurements to obtain the mechanism of growth of second phases is discussed. The effects of linear-gradient assumptions that have been used in an existing, closed-form, infinite-geometry model are evaluated. (Author)
Descriptors : (*CRYSTAL GROWTH, *PHASE STUDIES), (*PARTICLE SIZE, PHASE STUDIES), (*ALLOYS, PHASE STUDIES), KINETIC THEORY, SOLUTIONS(MIXTURES), MATHEMATICAL ANALYSIS
Subject Categories : Properties of Metals and Alloys
Distribution Statement : APPROVED FOR PUBLIC RELEASE