Evolution of nanoscale interstitial dislocation loops under coupling effect of stress and temperature

SCRIPTA MATERIALIA

卷:136

Article

Gao, Ning¹  Shen, Tielong¹  Kurtz, Richard²  Wang, Zhiguang¹  Gao, Fei³ 

[1] Inst Modern Phys, Lab Adv Nucl Mat, Lanzhou 730000, Peoples R China

[2] Pacific Northwest Natl Lab, POB 999, Richland, WA 99352 USA

[3] Univ Michigan, Dept Nucl Engn & Radiol Sci, Ann Arbor, MI 48109 USA

关键词: Dislocation loop;    Coupling effect;    Decomposition;    Non-conservation of burgers vector;    Molecular dynamics (MD);   

DOI  :  10.1016/j.scriptamat.2017.03.008

来源: Elsevier

【 摘 要 】

The properties of nano-scale interstitial dislocation loops under the coupling effect of stress and temperature are studied using atomistic simulation methods and experiments. The decomposition of a loop by the emission of smaller loops is identified as one of the major mechanisms to release the localized stress induced by the coupling effect, which is validated by the TEM observations. The classical conservation law of Burgers vector cannot be applied during such decomposition process. The dislocation network is formed from the decomposed loops, which may initiate the irradiation creep much earlier than expected through the mechanism of climb-controlled glide of dislocations. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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