Self-interstitial atom clusters as obstacles to glide of 1/3?11 0?{1 00} edge dislocations in a-zirconium.

Journal Article · Sat Jan 01 00:00:00 EST 2005 · Materials Science and Engineering A

DOI:https://doi.org/10.1016/j.msea.2005.03.056· OSTI ID:930710

Voskoboinikov, Roman E ^[1]; Osetskiy, Yury N ^[2]; Bacon, David J ^[1]

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1. University of Liverpool
2. ORNL

Atomic-scale details of interaction of a 1/3 {l_angle}11{bar 2}0{r_angle} {l_brace}1{bar 1}00{r_brace} edge dislocation with clusters of self-interstitial atoms (SIAs) in a-zirconium has been studied by computer simulation. Four typical clusters are considered. A triangular cluster of five SIAs lying within a basal plane bisected by the dislocation glide plane is not absorbed by the dislocation but acts as a moderately strong obstacle. A 3-D SIA cluster lying across the glide plane is completely absorbed by the dislocation by creation of super-jogs, and is a weak obstacle. Interaction of the dislocation with glissile SIA loops with perfect Burgers vector inclined at 60 degrees to the dislocation glide plane shows that the process depends on the vector orientation. Defects of the two orientations are strong obstacles, and one, which initially forms a sessile segment on the dislocation line, is particularly so.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 930710
• Journal Information: Materials Science and Engineering A, Vol. 400-401
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ATOMS
BURGERS VECTOR
COMPUTERIZED SIMULATION
DEFECTS
DISLOCATIONS
EDGE DISLOCATIONS
ORIENTATION
VECTORS