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Title: Mechanism for diffusion induced grain boundary migration

Grain boundaries are found to migrate under certain conditions when solute atoms are diffused along them. This phenomenon, termed diffusion induced grain boundary migration (DIGM), has now been found in six systems. The observed phenomenon and empirical data are used to discard certain concepts for the driving force and the mechanism. A mechanism is proposed in which differences in the diffusion coefficients of the diffusing species along the grain boundary cause a self-sustaining climb of grain boundary dislocations and motion of their associated grain boundary steps.
Authors:
;
Publication Date:
OSTI Identifier:
5013063
Report Number(s):
DOE/ER/05002-13
DOE Contract Number:
AS02-78ER05002
Resource Type:
Technical Report
Research Org:
Massachusetts Inst. of Tech., Cambridge (USA); National Bureau of Standards, Washington, DC (USA). Center for Materials Science
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; METALS; GRAIN BOUNDARIES; CRYSTAL STRUCTURE; ELEMENTS; MICROSTRUCTURE 360102* -- Metals & Alloys-- Structure & Phase Studies