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Effects of Grain Boundary Constraint on the Constitutive Response of Tantalum Bicrystals

Published online by Cambridge University Press:  15 February 2011

A. Ziegler ,
G. H. Campbell ,
M. Kumar  and
J. S. Stölken
A. Ziegler
Affiliation:
Material Science and Technology Division, Chemistry and Materials Science Directorate
G. H. Campbell
Affiliation:
Material Science and Technology Division, Chemistry and Materials Science Directorate
M. Kumar
Affiliation:
Material Science and Technology Division, Chemistry and Materials Science Directorate
J. S. Stölken
Affiliation:
New Technologies Engineering Division, Engineering Directorate Lawrence Livermore National Laboratory, University of California, Livermore, CA 94551, USA
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Abstract

The role of grain boundary constraint in strain localization, slip system activation, slip transmission, and the concomitant constitutive response was examined performing a series of uniaxial compression tests on tantalum bicrystals. Tantalum single crystals were diffusion bonded to form a (011) twist boundary and compressed along the [011] direction. The resulting threedimensional deformation was analyzed via volume reconstruction. With this technique, both the effective states of stress and strain over the cross-sectional area could be measured as a function of distance from the twist boundary, revealing a highly constrained grain boundary region. Post-test metallurgical characterization was performed using Electron Back-Scattered-Diffraction (EBSD) maps. The results, a spatial distribution of slip patterning and mapping of crystal rotation around the twist-boundary, were analyzed and compared to the known behavior of the individual single crystals. A rather large area near the grain boundary revealed no crystal rotation. Instead, patterns of alternating crystal rotation similar to single crystal experiments were found to be some distance away (~1mm) from the immediate grain boundary region, indicating the large length scale of the rotation free region.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 779: Symposium W – Multiscale Phenomena in Materials - Experiments and Modeling Related to Mechanical Behavior , 2003 , W6.4
Copyright
Copyright © Materials Research Society 2003

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