Stress relaxation in icosahedral small particles via generation of circular prismatic dislocation loops

A theoretical model is developed that describes stress relaxation in icosahedral small particles through generation of circular prismatic dislocation loops. It is shown that loop generation is energetically favorable in the equatorial section of the particle, the radius of which is larger than the c...

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Bibliographic Details
Published in:Scripta materialia 2015-08, Vol.105, p.10-13
Main Authors: Gutkin, M.Yu, Kolesnikova, A.L., Krasnitckii, S.A., Dorogin, L.M., Serebryakova, V.S., Vikarchuk, A.A., Romanov, A.E.
Format: Article
Language:English
Subjects:
Circularity
Disclinations
Dislocation loops
Dislocation nucleation
Icosahedral phase
Icosahedral small particles
Mathematical models
Optimization
Residual stresses
Stress relaxation
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Summary:A theoretical model is developed that describes stress relaxation in icosahedral small particles through generation of circular prismatic dislocation loops. It is shown that loop generation is energetically favorable in the equatorial section of the particle, the radius of which is larger than the critical one. The dislocation loop then extends until it reaches its optimal radius which increases with particle size. Both the critical particle radius and optimal loop radius strongly depend on dislocation core energy.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2015.04.015