Suppression of Localized Plastic Flow in Irradiated Materials

SCRIPTA MATERIALIA

卷:154

Article

Cui, Yinan¹  Po, Giacomo¹  Ghoniem, Nasr¹ 

[1] Univ Calif Los Angeles, Mech & Aerosp Engn Dept, 420 Westwood Plaza, Los Angeles, CA 90095 USA

关键词: Irradiation effects;    Dislocation channels;    Slip mode;    Dislocation structure;    Localized deformation;   

DOI  :  10.1016/j.scriptamat.2018.04.046

来源: Elsevier

【 摘 要 】

Suppressing deformation localization caused by dislocation channels is crucial in the reliable service of irradiated materials. Through 3D Discrete Dislocation Dynamics simulations, the evolution of deformation localization extent is quantitatively studied, and the effect of internal dislocation structure and slip mode are revealed. Results show that to inhibit dislocation channel formation, the material is required to be pretreated so as to enhance short-range dislocation interactions. This can be attained by introducing a homogeneously dense dislocation structure before irradiation, and by loading along orientations that activate multiple slip systems. Implications for the design of radiation-resistant materials are discussed. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free