Crystal plasticity investigation of the microstructural factors influencing dislocation channeling in a model irradiated bcc material

Patra, Anirban; McDowell, David L.

doi:10.1016/j.actamat.2016.03.041

Title: Crystal plasticity investigation of the microstructural factors influencing dislocation channeling in a model irradiated bcc material

Journal Article · Fri Mar 25 00:00:00 EDT 2016 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2016.03.041· OSTI ID:1304715

Patra, Anirban ^[1]; McDowell, David L. ^[2]

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.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1304715

Report Number(s):: LA-UR-15-29670

Journal Information:: Acta Materialia, Vol. 110, Issue C; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 43 works

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