New understanding of nano-scale interstitial dislocation loops in BCC iron

Journal Article · Wed Nov 15 04:00:00 EST 2017 · Journal of Physics: Condensed Matter

DOI:https://doi.org/10.1088/1361-648X/aa8a47· OSTI ID:1513203

Gao, Ning ^[1]; Chen, Jiachao ^[2]; Kurtz, Richard J. ^[3]; Wang, Z G. ^[4]; Zhang, R. F. ^[5]; Gao, Fei ^[6]

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1. CHINESE ACADEMY OF SCIENCES
2. Paul Scherrer Institut
3. BATTELLE (PACIFIC NW LAB)
4. Chinese Academy of Sciences
5. Beihang University
6. UNIVERSITY OF MICHIGAN

Complex states of nanoscale interstitial dislocation loop can be described by its habit plane and Burgers vector. Using atomistic simulations, we provide direct evidences on the change of the habit plane of a ½<111> loop from {111} to {110} and {211}, in agreement with TEM observations. A new {100} habit plane of this loop is also predicted by simulations. The non-conservation of the Burgers vector is approved theoretically for: (1) dislocation reactions between loops with different Burgers vectors and (2) the transition between <100> loops and ½<111> loops. The rotation from a ½<111> to a <100> loop has also been explored, which occurs at 570 K for time on the order of 10 seconds. The dislocation-precipitate phase duality and change of habit plane are then proposed as new features for nano-scale dislocation loops.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1513203
• Report Number(s): PNNL-SA-129117
• Journal Information: Journal of Physics: Condensed Matter, Journal Name: Journal of Physics: Condensed Matter Journal Issue: 45 Vol. 29
• Country of Publication: United States
• Language: English