Determining the strengths of HCP slip systems using harmonic analyses of lattice strain distributions

Dawson, P. R., Boyce, D. E., Park, J.-S., Wielewski, E. and Miller, M. P. (2018) Determining the strengths of HCP slip systems using harmonic analyses of lattice strain distributions. Acta Materialia, 144, pp. 92-106. (doi:10.1016/j.actamat.2017.10.032)

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Abstract

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.

Item Type:Articles
Additional Information:This work was supported by the US Office of Naval Research under awards N00014-12-1-0399 and N00014-16-1-2982.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Wielewski, Dr Euan
Authors: Dawson, P. R., Boyce, D. E., Park, J.-S., Wielewski, E., and Miller, M. P.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Acta Materialia
Publisher:Elsevier
ISSN:1359-6454
ISSN (Online):1873-2453
Published Online:15 October 2017

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