X-Ray Microbeam Laue Pattern Studies of the Spreading of Orientation in OFHC Copper at Large Strains

[+] Author and Article Information
G. C. Butler, S. R. Stock, R. D. McGinty, D. L. McDowell

Georgia Institute of Technology, Atlanta, GA 30332-0245

J. Eng. Mater. Technol 124(1), 48-54 (May 10, 2001) (7 pages) doi:10.1115/1.1421050 History: Received October 10, 2000; Revised May 10, 2001
Copyright © 2002 by ASME
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Transmission Laue patterns recorded with a 10 μm diameter pinhole collimator for as-received OFHC copper, after 50% compression, after 100% torsion, and after 50% compression followed by 50% torsion (clockwise from upper left). Lowest intensities are white with increasing diffraction intensity shown by darker pixels. The light square in each is the beam stop.
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Azimuthal variation of diffracted intensity along the black circles shown in Fig. 1; strain histories as labeled
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Laue patterns of the 50% compression, 50% torsion sample at four positions separated by 10 μm translations. The sequence is top left, bottom left, top right, then bottom right.
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Variation of angular spread (full width) of streaks from transmission Laue patterns, as a function of ε̄p2/3. The inverted triangles represent the average width.
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The variation in measured diffraction intensity at four different sample translation positions (66.94, 66.95, 66.96, and 66.97 mm). The peaks detected at the final two positions indicate the same microstructural feature is within the irradiated cylinder of material.
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The variation in measured diffraction intensity at four different sample translation positions (66.97, 66.98, 66.99, and 67.00 mm). The relative sizes of the two subpeaks detected at 66.97 mm and 66.98 mm are reversed.
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The variation in measured diffraction intensity at four different sample translation positions (67.00, 67.01, 67.02, and 67.03 mm). At 67.03 mm, the microstructural feature present in the other three patterns is no longer detected.
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Histograms for the angular separations between sub-streaks of a given diffraction streak for the sample which had undergone 50% compression and for the sample subjected to 100% torsion. The five independent measurement positions used were far enough apart to minimize bias.
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Comparison of {111} pole figures for OFHC copper following ε̄p=50% in compression: (a) measured, (b) calculated based on the classical extended Taylor constraint, and (c) calculated based on the non-classical extended Taylor constraint with substructure (βw=−0.25).



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