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

Journal Article · · Physical Review B
 [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)

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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); US Air Force Office of Scientific Research (AFOSR)
Grant/Contract Number:
AC02-06CH11357; AC52-07NA27344
OSTI ID:
1434933
Alternate ID(s):
OSTI ID: 1410730; OSTI ID: 1497287
Report Number(s):
LLNL-JRNL-749399; PRBMDO; 133946; TRN: US1802823
Journal Information:
Physical Review B, Vol. 96, Issue 17; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

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Cited By (2)

Automated Grain Yield Behavior Classification journal September 2019
Intermittent plasticity in individual grains: A study using high energy x-ray diffraction journal January 2019

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