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Interactions of impurities with a moving grain boundary

Conference:

Abstract

Most theories developed to explain interaction of impurities with a moving grain boundary involve a uniform excess impurity concentration distributed along a planar grain boundary. As boundary velocity increases, the excess impurities exert a net drag force on the boundary until a level is reached whereat the drag force no longer can balance the driving force and breakaway of the boundary from these impurities occurs. In this investigation, assumptions of a uniform lateral impurity profile and a planar grain boundary shape are relaxed by allowing both forward and lateral diffusion of impurities in the vicinity of a grain boundary. It is found that the two usual regions (drag of impurities by, and breakaway of a planar grain boundary) are separated by an extensive region wherein a uniform lateral impurity profile and a planar grain boundary shape are unstable. It is suspected that, in this unstable region, grain boundaries assume a spectrum of more complex morphologies and that elucidation of these morphologies can provide the first definitive description of the breakaway process and insight to more complex phenomena such as solid-solution strengthening, grain growth and secondary recrystallization.
Authors:
Bauer, C L [1] 
  1. Carnegie-Mellon Univ., Pittsburgh, Pa. (USA)
Publication Date:
Jan 01, 1975
Product Type:
Conference
Reference Number:
AIX-07-251026; ERA-02-007488; EDB-77-002719
Resource Relation:
Journal Name: J. Phys. (Paris), Colloq.; (France); Journal Volume: 4; Conference: International colloquium on grain boundaries in metals, Saint-Etienne, France, 16 Jun 1975
Subject:
36 MATERIALS SCIENCE; GRAIN BOUNDARIES; MOBILITY; DIFFUSION; IMPURITIES; CRYSTAL STRUCTURE; MICROSTRUCTURE; 360102* - Metals & Alloys- Structure & Phase Studies
OSTI ID:
7349570
Country of Origin:
France
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: JPQCA
Submitting Site:
INIS
Size:
Pages: C4.333-C4.338
Announcement Date:

Conference:

Citation Formats

Bauer, C L. Interactions of impurities with a moving grain boundary. France: N. p., 1975. Web.
Bauer, C L. Interactions of impurities with a moving grain boundary. France.
Bauer, C L. 1975. "Interactions of impurities with a moving grain boundary." France.
@misc{etde_7349570,
title = {Interactions of impurities with a moving grain boundary}
author = {Bauer, C L}
abstractNote = {Most theories developed to explain interaction of impurities with a moving grain boundary involve a uniform excess impurity concentration distributed along a planar grain boundary. As boundary velocity increases, the excess impurities exert a net drag force on the boundary until a level is reached whereat the drag force no longer can balance the driving force and breakaway of the boundary from these impurities occurs. In this investigation, assumptions of a uniform lateral impurity profile and a planar grain boundary shape are relaxed by allowing both forward and lateral diffusion of impurities in the vicinity of a grain boundary. It is found that the two usual regions (drag of impurities by, and breakaway of a planar grain boundary) are separated by an extensive region wherein a uniform lateral impurity profile and a planar grain boundary shape are unstable. It is suspected that, in this unstable region, grain boundaries assume a spectrum of more complex morphologies and that elucidation of these morphologies can provide the first definitive description of the breakaway process and insight to more complex phenomena such as solid-solution strengthening, grain growth and secondary recrystallization.}
journal = {J. Phys. (Paris), Colloq.; (France)}
volume = {4}
place = {France}
year = {1975}
month = {Jan}
}