Slip-System-Related Dislocation Study from In-Situ Neutron Measurements |
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| Authors: | E-Wen Huang Rozaliya Barabash Nan Jia Yan-Dong Wang Gene E. Ice Bjørn Clausen J. Horton Peter K. Liaw |
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| Affiliation: | (1) Materials Science and Engineering Department, University of Tennessee, Knoxville, TN 37996, USA;(2) Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;(3) Center for Materials Processing, University of Tennessee, Knoxville, USA;(4) Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang, 110004, P.R. China;(5) Los Alamos Neutron Science Center, Los Alamos National Laboratory, Los Alamos, NM 87545, USA;; |
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| Abstract: | A combined experimental/computational approach is employed to study slip-system-related dislocation-substructure formation during uniaxial tension of a single-phase, face-centered-cubic (fcc), nickel-based alloy. In-situ neutron-diffraction measurements were conducted to monitor the peak-intensity, peak-position, and peak-broadening evolution during a displacement-controlled, monotonic-tension experiment at room temperature. The measured lattice-strain evolution and the macrostress/macrostrain curves were used to obtain the material parameters required for simulating the texture development by a visco-plastic self-consistent (VPSC) model. The simulated texture compared favorably with experimentally-determined texture results over a range of 0 to 30 pct engineering strain. The grain-orientation-dependent input into the Debye-intensity ring was considered. Grains favorably oriented relative to the two detector banks in the geometry of the neutron experiment were indicated. For the favorably oriented grains, the simulated slip-system activity was used to calculate the slip-system-dependent, dislocation-contrast factor. The combination of the calculated contrast factor with the experimentally-measured peak broadening allows the assessment of the parameters of the dislocation arrangement within the specifically oriented grains, which has a quantitative agreement with the transmission-electron-microscopy results. This article is based on a presentation given in the symposium entitled “Neutron and X-Ray Studies for Probing Materials Behavior,” which occurred during the TMS Spring Meeting in New Orleans, LA, March 9–13, 2008, under the auspices of the National Science Foundation, TMS, the TMS Structural Materials Division, and the TMS Advanced Characterization, Testing, and Simulation Committee.
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