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Title: Grain boundary kinetics: 1, In-situ observations of coupled grain boundary dislocation motion, crystal translation and boundary displacement

Abstract

Extensive stress-induced climb-glide motion of secondary grain boundary dislocations (SGBDs) in near-..sigma..5 grain boundaries in gold was directly observed and video recorded by means of hot-stage in-situ transmission electron microscopy. The passage of appreciable numbers of SGBDs along the boundary (N) caused a translation of the abutting crystals with respect to one another (T) and a lateral displacement of the boundary with respect to each crystal (D/sub i/). Quantitative measurements of N, T, and D/sub i/ for a number of boundaries provided unambiguous evidence that these three processes were coupled. The observed T's and D/sub i/'s were in agreement with a geometrical model involving the N's, the Burgers vectors of the moving SGBDs, and the heights of the steps which the SGBDs were expected to produce in the boundary plane. Most of the SGBDs whose motion produced the measured translations and displacements were intrinsic in nature; a minor fraction appeared to be intrinsic. The deduced SGBD-step configurations tended to be those associated with the smaller step heights possible within the framework of the ..sigma..5 CSL. Operating sources and sinks for moving SGBDs were directly observed in some of the boundaries. 18 refs., 10 figs., 1 tab.

Authors:
;
Publication Date:
Research Org.:
Massachusetts Inst. of Tech., Cambridge (USA). Dept. of Materials Science and Engineering
OSTI Identifier:
6364623
Report Number(s):
DOE/ER/45310-15
ON: DE89006790
DOE Contract Number:  
FG02-87ER45310
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; GRAIN BOUNDARIES; KINETICS; BICRYSTALS; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DISLOCATIONS; GOLD; IMAGE PROCESSING; TRANSMISSION ELECTRON MICROSCOPY; CRYSTAL DEFECTS; CRYSTALS; ELECTRON MICROSCOPY; ELEMENTS; LINE DEFECTS; METALS; MICROSCOPY; MICROSTRUCTURE; POLYCRYSTALS; PROCESSING; TRANSITION ELEMENTS; 360102* - Metals & Alloys- Structure & Phase Studies; 360101 - Metals & Alloys- Preparation & Fabrication

Citation Formats

Babcock, S E, and Balluffi, R W. Grain boundary kinetics: 1, In-situ observations of coupled grain boundary dislocation motion, crystal translation and boundary displacement. United States: N. p., 1989. Web.
Babcock, S E, & Balluffi, R W. Grain boundary kinetics: 1, In-situ observations of coupled grain boundary dislocation motion, crystal translation and boundary displacement. United States.
Babcock, S E, and Balluffi, R W. Sun . "Grain boundary kinetics: 1, In-situ observations of coupled grain boundary dislocation motion, crystal translation and boundary displacement". United States.
@article{osti_6364623,
title = {Grain boundary kinetics: 1, In-situ observations of coupled grain boundary dislocation motion, crystal translation and boundary displacement},
author = {Babcock, S E and Balluffi, R W},
abstractNote = {Extensive stress-induced climb-glide motion of secondary grain boundary dislocations (SGBDs) in near-..sigma..5 grain boundaries in gold was directly observed and video recorded by means of hot-stage in-situ transmission electron microscopy. The passage of appreciable numbers of SGBDs along the boundary (N) caused a translation of the abutting crystals with respect to one another (T) and a lateral displacement of the boundary with respect to each crystal (D/sub i/). Quantitative measurements of N, T, and D/sub i/ for a number of boundaries provided unambiguous evidence that these three processes were coupled. The observed T's and D/sub i/'s were in agreement with a geometrical model involving the N's, the Burgers vectors of the moving SGBDs, and the heights of the steps which the SGBDs were expected to produce in the boundary plane. Most of the SGBDs whose motion produced the measured translations and displacements were intrinsic in nature; a minor fraction appeared to be intrinsic. The deduced SGBD-step configurations tended to be those associated with the smaller step heights possible within the framework of the ..sigma..5 CSL. Operating sources and sinks for moving SGBDs were directly observed in some of the boundaries. 18 refs., 10 figs., 1 tab.},
doi = {},
url = {https://www.osti.gov/biblio/6364623}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}

Technical Report:
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