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Title: Bright x-rays reveal shifting deformation states and effects of the microstructure on the plastic deformation of crystalline materials

Abstract

The plastic deformation of crystalline materials is usually modeled as smoothly progressing in space and time, yet modern studies show intermittency in the deformation dynamics of single-crystals arising from avalanche behavior of dislocation ensembles under uniform applied loads. However, once the prism of the microstructure in polycrystalline materials disperses and redistributes the load on a grain-by-grain basis, additional length and time scales are involved. Thus, the question is open as to how deformation intermittency manifests for the nonuniform grain-scale internal driving forces interacting with the finer-scale dislocation ensemble behavior. In this work we track the evolution of elastic strain within individual grains of a creep-loaded titanium alloy, revealing widely varying internal strains that fluctuate over time. Here, the findings provide direct evidence of how flow intermittency proceeds for an aggregate of ~700 grains while showing the influences of multiscale ensemble interactions and opening new avenues for advancing plasticity modeling.

Authors:
 [1];  [2];  [2];  [2];  [2];  [3];  [3];  [4];  [5];  [5]
  1. Cornell Univ., Ithaca, NY (United States). Cornell High Energy Synchrotron Source (CHESS)
  2. Air Force Research Lab. (AFRL), Wright-Patterson AFB, OH (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. The Ohio State Univ., Columbus, OH (United States); BlueQuartz Software, Springboro, OH (United States)
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); US Air Force Office of Scientific Research (AFOSR)
OSTI Identifier:
1434933
Alternate Identifier(s):
OSTI ID: 1410730; OSTI ID: 1497287
Report Number(s):
LLNL-JRNL-749399
Journal ID: ISSN 2469-9950; PRBMDO; 133946; TRN: US1802823
Grant/Contract Number:  
AC02-06CH11357; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 17; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Beaudoin, A. J., Shade, P. A., Schuren, J. C., Turner, T. J., Woodward, C., Bernier, J. V., Li, S. F., Dimiduk, D. M., Kenesei, P., and Park, J. -S. Bright x-rays reveal shifting deformation states and effects of the microstructure on the plastic deformation of crystalline materials. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.174116.
Beaudoin, A. J., Shade, P. A., Schuren, J. C., Turner, T. J., Woodward, C., Bernier, J. V., Li, S. F., Dimiduk, D. M., Kenesei, P., & Park, J. -S. Bright x-rays reveal shifting deformation states and effects of the microstructure on the plastic deformation of crystalline materials. United States. doi:10.1103/PhysRevB.96.174116.
Beaudoin, A. J., Shade, P. A., Schuren, J. C., Turner, T. J., Woodward, C., Bernier, J. V., Li, S. F., Dimiduk, D. M., Kenesei, P., and Park, J. -S. Thu . "Bright x-rays reveal shifting deformation states and effects of the microstructure on the plastic deformation of crystalline materials". United States. doi:10.1103/PhysRevB.96.174116. https://www.osti.gov/servlets/purl/1434933.
@article{osti_1434933,
title = {Bright x-rays reveal shifting deformation states and effects of the microstructure on the plastic deformation of crystalline materials},
author = {Beaudoin, A. J. and Shade, P. A. and Schuren, J. C. and Turner, T. J. and Woodward, C. and Bernier, J. V. and Li, S. F. and Dimiduk, D. M. and Kenesei, P. and Park, J. -S.},
abstractNote = {The plastic deformation of crystalline materials is usually modeled as smoothly progressing in space and time, yet modern studies show intermittency in the deformation dynamics of single-crystals arising from avalanche behavior of dislocation ensembles under uniform applied loads. However, once the prism of the microstructure in polycrystalline materials disperses and redistributes the load on a grain-by-grain basis, additional length and time scales are involved. Thus, the question is open as to how deformation intermittency manifests for the nonuniform grain-scale internal driving forces interacting with the finer-scale dislocation ensemble behavior. In this work we track the evolution of elastic strain within individual grains of a creep-loaded titanium alloy, revealing widely varying internal strains that fluctuate over time. Here, the findings provide direct evidence of how flow intermittency proceeds for an aggregate of ~700 grains while showing the influences of multiscale ensemble interactions and opening new avenues for advancing plasticity modeling.},
doi = {10.1103/PhysRevB.96.174116},
journal = {Physical Review B},
number = 17,
volume = 96,
place = {United States},
year = {2017},
month = {11}
}

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