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Grain Boundary Responses to Local and Applied Stress: An In Situ TEM Deformation Study

Published online by Cambridge University Press:  26 July 2012

Bryan Miller ,
Jamey Fenske ,
Dong Su ,
Chung-Ming Li ,
Lisa Dougherty  and
Ian M. Robertson
Bryan Miller
Affiliation:
bmiller1@uiuc.edu, University of Illinois at Urbana-Champaign, Materials Science and Enigneering, 1304 W. Green St., Urbana, IL, 61801, United States
Jamey Fenske
Affiliation:
bmiller1@uiuc.edu, University of Illinois at Urbana-Champaign, Materials Science and Enigneering, 1304 W. Green St., Urbana, IL, 61801, United States
Dong Su
Affiliation:
bmiller1@uiuc.edu, University of Illinois at Urbana-Champaign, Materials Science and Enigneering, 1304 W. Green St., Urbana, IL, 61801, United States
Chung-Ming Li
Affiliation:
bmiller1@uiuc.edu, University of Illinois at Urbana-Champaign, Materials Science and Enigneering, 1304 W. Green St., Urbana, IL, 61801, United States
Lisa Dougherty
Affiliation:
bmiller1@uiuc.edu, University of Illinois at Urbana-Champaign, Materials Science and Enigneering, 1304 W. Green St., Urbana, IL, 61801, United States
Ian M. Robertson
Affiliation:
ianr@ad.uiuc.edu, University of Illinois at Urbana-Champaign, Materials Science and Enigneering, 1304 W. Green St., Urbana, IL, 61801, United States
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Abstract

Deformation experiments at temperatures between 300 and 750 K have been performed in situ in the transmission electron microscope to investigate dislocation interactions and reactions with grain boundaries and other obstacles. Dislocations, both partial and perfect, as well as deformation twins have been observed being emitted from grain boundaries and, in some cases, even the same grain boundary. The ejection of dislocations from the grain boundary can result in its partial or total annihilation. In the latter case, the disintegration of the grain boundary was accompanied by grain growth and a change in misorientation.

Keywords

dislocationstransmission electron microscopy (TEM)grain boundaries

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