Mechanism of steady-state grain growth in aluminum |
| |
Authors: | Frederick N Rhines Kenneth R Craig Robert T DeHoff |
| |
Affiliation: | (1) Department of Materials Science and Engineering, University of Florida, 32601 Gainesville, Fla.;(2) Allied Chemical Corporation, Morristown, N.J;(3) Department of Materials Science and Engineering, University of Florida, 32601 Gainesville, Fla. |
| |
Abstract: | Grain growth, defined as the increase in volume of the average grain, is found, in its steadystate, to be directly proportional
to the time of isothermal annealing. During steady-state grain growth the grain corners are found all to be quadruple points,
the grain edges all triple lines and the ratio of corners to faces to edges to be 6:7:12. The rate constant for steady-state
grain growth is shown to be calculable from first principles and from properties that can be measured independently of the
growth observation. It is the product of four individual constants, namely: 1) a dimensionless topological constant ⊝ that
is characteristic of steady-state grain growth in any material, 2) the mobility ώ of the average grain boundary in the specific
material, 3) the surface tension y of the average grain boundary in the specific material and 4) a dimensionless structural
constant σ which expresses the curvature of surface of the grain boundary in the array of grain forms obtaining in the specific
specimen of the material and which can be determined metallographically. The topological changes that constitute steady-state
growth are shown to exist as a logical sequence of simple events.
Rewritten for publication from theAndrew Carnegie Lecture of the Pittsburgh Section of the American Society for Metals; presented by Frederick N. Rhines on November 9, 1972. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|