Bright x-rays reveal shifting deformation states and effects of the microstructure on the plastic deformation of crystalline materials
- Cornell Univ., Ithaca, NY (United States). Cornell High Energy Synchrotron Source (CHESS)
- Air Force Research Lab. (AFRL), Wright-Patterson AFB, OH (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- The Ohio State Univ., Columbus, OH (United States); BlueQuartz Software, Springboro, OH (United States)
- 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
Web of Science
Automated Grain Yield Behavior Classification
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journal | September 2019 |
Intermittent plasticity in individual grains: A study using high energy x-ray diffraction
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journal | January 2019 |
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