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Synchrotron X-ray study of bulk lattice strains in externally loaded Cu-Mo composites

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Abstract

A synchrotron X-ray transmission technique was applied to study the internal load transfer and micromechanical damage in molybdenum particle-reinforced copper matrix composites during plastic deformation. Mechanically loaded, 1.5-mm-thick specimens were irradiated with a monochromatic beam of 65 keV X-rays. Low-index diffraction rings of both phases were recorded with a high-resolution two-dimensional detector. By means of newly developed data processing routines, we could quantify as a function of applied stress both the ring distortion (from which the volume-averaged elastic strains in the two phases were calculated), and the ring graininess (which is related to the Bragg peak broadening). Based on this information, the deformation and damage processes in these alloys were studied in detail. As compared to conventional neutron diffraction methods, the photon transmission technique yielded similar precision but at much reduced measurement times. The main sources of experimental errors were identified and strategies to minimize these errors were developed.

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Authors and Affiliations

  1. the Institute für Metallkunde, Universität Stuttgart, D-70174, Stuttgart, Germany

    Alexander Wanner (Akademischer Rat)

  2. the Department of Materials Science and Engineering, Northwestern University, 60208, Evanston, IL

    David C. Dunand (Associate Professor)

Authors
  1. Alexander Wanner
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  2. David C. Dunand
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Wanner, A., Dunand, D.C. Synchrotron X-ray study of bulk lattice strains in externally loaded Cu-Mo composites. Metall Mater Trans A 31, 2949–2962 (2000). https://doi.org/10.1007/BF02830344

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  • DOI: https://doi.org/10.1007/BF02830344

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