Journal
ACTA MATERIALIA
Volume 144, Issue -, Pages 92-106Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2017.10.032
Keywords
Slip system strength; X-ray diffraction; Finite element simulations; Harmonic expansions; Titanium
Funding
- US Office of Naval Research [N00014-12-1-0399, N00014-16-1-2982]
- National Science Foundation
- National Institutes of Health/National Institute of General Medical Sciences under NSF [DMR-1332208]
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A robust methodology is presented to extract slip system strengths from lattice strain distributions for polycrystalline samples obtained from high-energy x-ray diffraction (HEXD) experiments with in situ loading. The methodology consists of matching the evolution of coefficients of a harmonic expansion of the distributions from simulation to the coefficients derived from measurements. Simulation results are generated via finite element simulations of virtual polycrystals that are subjected to the loading history applied in the HEXD experiments. Advantages of the methodology include: (1) its ability to utilize extensive data sets generated by HEXD experiments; (2) its ability to capture trends in distributions that may be noisy (both measured and simulated); and (3) its sensitivity to the ratios of the family strengths. The approach is used to evaluate the slip system strengths of Ti-6Al-4V using samples having relatively equiaxed grains. These strength estimates are compared to values in the literature. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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