ISSN:
1573-4900
Keywords:
Computer simulation
;
Crowdion
;
Defect clusters
;
Dislocation loop
;
Nickel
;
Peierls stress
;
Radiation defect
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The atomic structure and dynamic behavior of interstitial clusters, i.e., a bundle of 〈110〉 crowdions, have been investigated in a model Ni lattice. An extended dislocation loop was obtained after full relaxation of a loop of hexagonal shape, consisting of four dislocation segments lying on {111} slip planes and two dislocation segments on {100} slip planes. The dislocation segments on {111} slip planes are extended, but the segments on {100} slip planes are not extended. By observing the motion of a dislocation loop under axially symmetrical shear stress, the Peierls stress for the dislocation loop was obtained. Also, a diamond-shaped dislocation loop was constructed in the model lattice, consisting of four dislocation segments on {111} slip planes and no segments on {100} slip planes. The Peierls stress for this diamond-shaped dislocation loop was found to be less than that for the hexagonal-shaped dislocation loop.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1026507023335
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