Accession Number : AD0760580

Title :   A Topological Study of Grain Growth.

Descriptive Note : Final rept. 1 Jul 70-15 Oct 72,

Corporate Author : FLORIDA UNIV GAINESVILLE ENGINEERING AND INDUSTRIAL EXPERIMENT STATION

Personal Author(s) : Rhines,Frederick N.

Report Date : MAR 1973

Pagination or Media Count : 94

Abstract : The characterization of the topological properties during isothermal grain growth has made it possible, for the first time, to describe grain growth as a topological process and to define its kinetics. Grain growth has been associated with a topological change in which the average topological values per grain in the system approaching limiting values equivalent to those of a tetrakaidecahedron. Experimentally it is found that the product of the total curvature per unit volume and the surface area per unit volume maintains a constant ratio to the grain size constant. Grain growth has been described in this study as taking place in two modes: steady and non-steady state. These relationships have led to the development of a new kinetic equation for grain growth. (Modified author abstract)

Descriptors :   (*GRAIN STRUCTURES(METALLURGY), CRYSTAL GROWTH), SHRINKAGE, GRAIN BOUNDARIES, MICROSTRUCTURE, GRAIN SIZE, TOPOLOGY, NETWORKS, ALUMINUM, COMPUTER PROGRAMS

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE