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Title: Crystal Plasticity Model Validation Using Combined High-Energy Diffraction Microscopy Data for a Ti-7Al Specimen

High-Energy Diffraction Microscopy (HEDM) is a 3-d x-ray characterization method that is uniquely suited to measuring the evolving micromechanical state and microstructure of polycrystalline materials during in situ processing. The near-field and far-field configurations provide complementary information; orientation maps computed from the near-field measurements provide grain morphologies, while the high angular resolution of the far-field measurements provide intergranular strain tensors. The ability to measure these data during deformation in situ makes HEDM an ideal tool for validating micro-mechanical deformation models that make their predictions at the scale of individual grains. Crystal Plasticity Finite Element Models (CPFEM) are one such class of micro-mechanical models. While there have been extensive studies validating homogenized CPFEM response at a macroscopic level, a lack of detailed data measured at the level of the microstructure has hindered more stringent model validation efforts. We utilize an HEDM dataset from an alphatitanium alloy (Ti-7Al), collected at the Advanced Photon Source, Argonne National Laboratory, under in situ tensile deformation. The initial microstructure of the central slab of the gage section, measured via near-field HEDM, is used to inform a CPFEM model. The predicted intergranular stresses for 39 internal grains are then directly compared to data from 4 far-field measurementsmore » taken between ~4% and ~80% of the macroscopic yield strength. In conclusion, the intergranular stresses from the CPFEM model and far-field HEDM measurements up to incipient yield are shown to be in good agreement, and implications for application of such an integrated computational/experimental approach to phenomena such as fatigue and crack propagation is discussed.« less
Authors:
 [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [5] ;  [4]
  1. Air Force Research Lab., Wright-Patterson AFB (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Air Force Research Lab., Wright-Patterson AFB (United States); Nutonian Inc., Somerville, MA (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Carnegie Mellon Univ., Pittsburgh, PA (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
Additional Journal Information:
Journal Volume: 48; Journal Issue: 2; Journal ID: ISSN 1073-5623
Publisher:
ASM International
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Air Force Research Laboratory (AFRL), Materials and Manufacturing Directorate
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; three-dimensional microstructure; High Energy Diffraction Microscopy (HEDM); crystal plasticity finite element modeling (CPFEM); far field diffraction; near field diffraction; x-ray diffraction
OSTI Identifier:
1390797

Turner, Todd J., Shade, Paul A., Bernier, Joel V., Li, Shiu Fai, Schuren, Jay C., Kenesei, Peter, Suter, Robert M., and Almer, Jonathan. Crystal Plasticity Model Validation Using Combined High-Energy Diffraction Microscopy Data for a Ti-7Al Specimen. United States: N. p., Web. doi:10.1007/s11661-016-3868-x.
Turner, Todd J., Shade, Paul A., Bernier, Joel V., Li, Shiu Fai, Schuren, Jay C., Kenesei, Peter, Suter, Robert M., & Almer, Jonathan. Crystal Plasticity Model Validation Using Combined High-Energy Diffraction Microscopy Data for a Ti-7Al Specimen. United States. doi:10.1007/s11661-016-3868-x.
Turner, Todd J., Shade, Paul A., Bernier, Joel V., Li, Shiu Fai, Schuren, Jay C., Kenesei, Peter, Suter, Robert M., and Almer, Jonathan. 2016. "Crystal Plasticity Model Validation Using Combined High-Energy Diffraction Microscopy Data for a Ti-7Al Specimen". United States. doi:10.1007/s11661-016-3868-x. https://www.osti.gov/servlets/purl/1390797.
@article{osti_1390797,
title = {Crystal Plasticity Model Validation Using Combined High-Energy Diffraction Microscopy Data for a Ti-7Al Specimen},
author = {Turner, Todd J. and Shade, Paul A. and Bernier, Joel V. and Li, Shiu Fai and Schuren, Jay C. and Kenesei, Peter and Suter, Robert M. and Almer, Jonathan},
abstractNote = {High-Energy Diffraction Microscopy (HEDM) is a 3-d x-ray characterization method that is uniquely suited to measuring the evolving micromechanical state and microstructure of polycrystalline materials during in situ processing. The near-field and far-field configurations provide complementary information; orientation maps computed from the near-field measurements provide grain morphologies, while the high angular resolution of the far-field measurements provide intergranular strain tensors. The ability to measure these data during deformation in situ makes HEDM an ideal tool for validating micro-mechanical deformation models that make their predictions at the scale of individual grains. Crystal Plasticity Finite Element Models (CPFEM) are one such class of micro-mechanical models. While there have been extensive studies validating homogenized CPFEM response at a macroscopic level, a lack of detailed data measured at the level of the microstructure has hindered more stringent model validation efforts. We utilize an HEDM dataset from an alphatitanium alloy (Ti-7Al), collected at the Advanced Photon Source, Argonne National Laboratory, under in situ tensile deformation. The initial microstructure of the central slab of the gage section, measured via near-field HEDM, is used to inform a CPFEM model. The predicted intergranular stresses for 39 internal grains are then directly compared to data from 4 far-field measurements taken between ~4% and ~80% of the macroscopic yield strength. In conclusion, the intergranular stresses from the CPFEM model and far-field HEDM measurements up to incipient yield are shown to be in good agreement, and implications for application of such an integrated computational/experimental approach to phenomena such as fatigue and crack propagation is discussed.},
doi = {10.1007/s11661-016-3868-x},
journal = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},
number = 2,
volume = 48,
place = {United States},
year = {2016},
month = {11}
}

Works referenced in this record:

An introduction to three-dimensional X-ray diffraction microscopy
journal, October 2012