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Microdiffraction Experiments and Modeling for Analyzing Multiscale Dislocation Ensembles in Materials

Published online by Cambridge University Press:  15 February 2011

G.E. Ice
Affiliation:
Metals & Ceramics Divisions, Oak Ridge National Laboratory, Oak Ridge TN 37831
R.I. Barabash
Affiliation:
Metals & Ceramics Divisions, Oak Ridge National Laboratory, Oak Ridge TN 37831
J. Pang
Affiliation:
Metals & Ceramics Divisions, Oak Ridge National Laboratory, Oak Ridge TN 37831
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Abstract

The intensity distribution of Laue diffraction is analyzed as a function of local misorientation. We show how unpaired dislocations alter the white beam Laue patterns for isolated dislocations, for dislocation walls, and for a combination of both. We consider the effect of different statistically and geometrically necessary dislocation densities on the intensity distribution along and perpendicular to the Laue streak. A 3D x-ray crystal microscope is used to analyze the complicated plastic-elastic field in a grain of a Ni polycrystalline sample during in-situ uniaxial pulling. A change of dislocation activity with depth is demonstrated. The dislocation slip systems and their densities are determined at various depths. The model parameters are used to simulate the whole Laue pattern including details about the contours for specific Laue spots; good agreement is found between simulated and experimental contours.

Type
Research Article
Copyright
Copyright © Materials Research Society 2003

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References

1. Fleck, N., Muller, G., Ashby, M., Hutchinson, J., Acta Metall. Mater., 42, 2, 475, (1994).Google Scholar
2. Begley, M.R., Hutchinson, J.W., J. Mech. Phys. Solids, 46, 2049, (1998).Google Scholar
3. Gao, H., Huang, Y., Nix, W.D. and Hutchinson, J.W., J. Mech. Phys. Solids, 47, 1239, (1999)Google Scholar
4. Huang, Y., Gao, H., Nix, W., Hutchinson, J., J. Mech. Phys. Solids, 47, 1239, (2000).Google Scholar
5. Ice, G.E. and Larson, B.C., Adv. Eng. Mater., 2, 10, 643, (2002).Google Scholar
6. Larson, B.C., Yang, Wenge, Ice, G.E., Budai, J.D., Tischler, J.Z., Nature, 415, 887, (2002).Google Scholar
7. Mughrabi, H., Ungar, T., Kienle, W., Wilkens, M. Phil. Mag. A53:793, (1986).Google Scholar
8. Hughes, D. and Hansen, N., Acta Mater. 48, 29853004, (2000).Google Scholar
9. Barabash, R., Ice, G.E., Larson, B.C., Pharr, G.M., Chung, K.-S., Yang, W., Appl. Phys. Lett., 79, 749, (2001).Google Scholar
10. Barabash, R., Ice, G.E., Walker, F., J.Appl.Physics, 93, 3, 14571464, (2003).Google Scholar
11. Hecker, H., Thiele, E., Holste, C., Acta Mater. 50, 2357,(2002).Google Scholar
12. Scripta, Schwink C. Metall 27, 963, (1992).Google Scholar
13 Huang, X. and Hansen, N., Scripta Mater. 37(1),17, (1997)Google Scholar
14. Winther, G., et al., in “Textures of Materials”, Pts 1 and 2. 2002. p. 287292.Google Scholar
15. Tatschl, A. and Kolednik, O., Mater. Sci. Engineering, A 342, 12, 152, (2003).Google Scholar