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

Journal Article · Sat Jul 01 04:00:00 EDT 2017 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2017.03.008· OSTI ID:1358476

Gao, Ning; Shen, Tielong; Kurtz, Richard; Wang, Zhiguang; Gao, Fei

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.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1358476
• Report Number(s): PNNL-SA-124673; AT2030110
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Vol. 136; ISSN 1359-6462
• Publisher: Elsevier
• Country of Publication: United States
• Language: English