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Analysis of Compression Behavior of a [011] TA Single Crystal with Orientation Imaging Microscopy and Crystal Plasticity

Published online by Cambridge University Press:  15 February 2011

A.J. Schwartz
Affiliation:
Lawrence Livermore National Laboratory, Materials Science and Technology Division, Livermore, CA 94550 ajschwartz@llnl.gov
J.S. Stölken
Affiliation:
Lawrence Livermore National Laboratory, Materials Science and Technology Division, Livermore, CA 94550
W.E. King
Affiliation:
Lawrence Livermore National Laboratory, Materials Science and Technology Division, Livermore, CA 94550
G.H. Campbell
Affiliation:
Lawrence Livermore National Laboratory, Materials Science and Technology Division, Livermore, CA 94550
D.H. Lassila
Affiliation:
Lawrence Livermore National Laboratory, Materials Science and Technology Division, Livermore, CA 94550
J.Y. Shu
Affiliation:
Lawrence Livermore National Laboratory, Materials Science and Technology Division, Livermore, CA 94550
S. Sun
Affiliation:
Materials Science and Engineering Department, Carnegie Mellon University, Pittsburgh, PA 15213
B.L. Adams
Affiliation:
Materials Science and Engineering Department, Carnegie Mellon University, Pittsburgh, PA 15213
Corresponding
E-mail address:
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Abstract

High-purity tantalum single crystal cylinders oriented with [011] parallel to the cylinder axis were deformed 10, 20, and 30 percent in compression. The engineering stress-strain curve exhibited an up-turn at strains greater than ∼20% while the samples took on an ellipsoidal shape during testing, elongated along the [100] direction with almost no dimensional change along [011]. Two orthogonal planes were selected for characterization using Orientation Imaging Microscopy (OIM): one plane containing [100] and [011] (longitudinal) and the other in the plane containing [011] and [011] (transverse). OIM revealed patterns of alternating crystal rotations that develop as a function of strain and exhibit evolving length scales. The spacing and magnitude of these alternating misorientations increases in number density and decreases in spacing with increasing strain. Classical crystal plasticity calculations were performed to simulate the effects of compression deformation with and without the presence of friction. The calculated stressstrain response, local lattice reorientations, and specimen shape are compared with experiment.

Type
Research Article
Copyright
Copyright © Materials Research Society 1999

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Analysis of Compression Behavior of a [011] TA Single Crystal with Orientation Imaging Microscopy and Crystal Plasticity
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