Computer modelling of particle limited grain growth and its experimental verification

Conference · Sun Jan 01 04:00:00 EST 1989

OSTI ID:5659281

Doherty, R D; Li, K; Kashyup, K; Rollett, A D; Anderson, M P

Data from two simulations on particle limited grain growth are reported. For 3D simulations the same type of strong correlation between particles and grain boundaries previously found in 2D simulations was found with the limiting grain size scaling in 3D with (l/f){sup 0.31}. Very much higher particle correlation with grain boundaries and particularly with grain corners was obtained than expected for the random microstructure. The size distribution of the pinned grain structures showed considerable differences from that of dynamically evolving single phase structures -- notably an absence of small grains with radii less than 0.3 and the presence of a few large grains in the pinned samples. In 2D simulations from a finite starting grain size which may explain at least part of the wide scatter in pinned grain sizes reported from experimental studies. It is suggested that normal grain growth ceases when the smallest grains in the size distribution can no longer shrink. Finally limited new experimental data on grain growth with a stable dispersion in an Al-Fe alloy is reported. This data is, at least partially, in agreement with the simulation results but most strikingly shows a ready transition to abnormal grain growth at low volume fraction of second phase particles. A simple model for this effect is proposed -- based on the Zener analysis but applied only to abnormal grain growth into a fine grain structure pinned to a small grain size in the manner suggested by the simulations. 39 refs., 14 figs., 5 tabs.

• Research Organization: Los Alamos National Lab., NM (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5659281
• Report Number(s): LA-UR-89-3029; CONF-8909209--1; ON: DE90000605
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
ALLOYS
ALUMINIUM ALLOYS
COMPUTERIZED SIMULATION
CRYSTAL STRUCTURE
GRAIN BOUNDARIES
GRAIN GROWTH
GRAIN SIZE
IRON ALLOYS
MICROSTRUCTURE
MONTE CARLO METHOD
SIMULATION
SIZE