Competing Processes in Reactions between an Edge Dislocation and Dislocation Loops in a Body-Centred Cubic Metal

Journal Article · Fri Jan 01 04:00:00 EST 2010 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2010.01.034· OSTI ID:1009501

Terentyev, Dmitry ^[1]; Bacon, David J ^[2]; Osetskiy, Yury N ^[3]

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1. Belgian Nuclear Research Centre, SCK-CEN
2. University of Liverpool
3. ORNL

Molecular dynamics simulation was used to investigate reactions of a 1/2<111>{l_brace}110{r_brace} edge dislocation with interstitial dislocation loops of 1/2<111> and <100> type in a model of iron. Whether loops are strong or weak obstacles depends not only on loop size and type, but also on temperature and dislocation velocity. These parameters determine whether a loop is absorbed on the dislocation or left behind as it glides away. Absorption requires glide of a reaction segment over the loop surface and cross-slip of dipole dislocation arms attached to the ends of the segment: these mechanisms depend on temperature and strain rate, as discussed here.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1009501
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 9 Vol. 62; ISSN 1359-6462
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION
DIPOLES
DISLOCATIONS
EDGE DISLOCATIONS
INTERSTITIALS
IRON
SIMULATION
STRAIN RATE
VELOCITY