Crystal plasticity investigation of the microstructural factors influencing dislocation channeling in a model irradiated bcc material
Journal Article
·
· Acta Materialia
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Georgia Inst. of Technology, Atlanta, GA (United States). School of Materials Science and Engineering
- Georgia Inst. of Technology, Atlanta, GA (United States). School of Materials Science and Engineering and Woodruff School of Mechanical Engineering
We use a continuum crystal plasticity framework to study the effect of microstructure and mesoscopic factors on dislocation channeling and flow localization in an irradiated model bcc alloy. For simulated dislocation channeling characteristics we correlate the dislocation and defect densities in the substructure, local Schmid factor, and stress triaxiality, in terms of their temporal and spatial evolution. A metric is introduced to assess the propensity for localization and is correlated to the grain-level Schmid factor. We also found that localization generally takes place in grains with a local Schmid factor in the range 0.42 or higher. Surface slip step heights are computed at free surfaces and compared to relevant experiments.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1304715
- Alternate ID(s):
- OSTI ID: 22554549
- Report Number(s):
- LA-UR--15-29670
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 110; ISSN 1359-6454
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Completing the picture through correlative characterization
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journal | June 2019 |
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