Effect of the alpha-gamma phase transition on the stability of dislocation loops in bcc iron |
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Authors: | Dudarev S L Bullough R Derlet P M |
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Institution: | EURATOM/UKAEA Fusion Association, Culham Science Centre, Oxfordshire OX14 3DB, United Kingdom. sergi.dudarev@ukaea.org.uk |
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Abstract: | Body-centered-cubic iron develops an elastic instability, driven by spin fluctuations, near the alpha-gamma phase transition temperature T(c) = 912 degrees C that is associated with the dramatic reduction of the shear stiffness constant c' (c(11)-c(12))/2 near T(c). This reduction of c' has a profound effect on the temperature dependence of the anisotropic elastic self-energies of dislocations in iron. It also affects the relative stability of the a100] and a/2111] prismatic edge dislocation loops formed during irradiation. The difference between the anisotropic elastic free energies provides the fundamental explanation for the observed dominant occurrence of the a100], as opposed to the a/2111], Burgers vector configurations of prismatic dislocation loops in iron and iron-based alloys at high temperatures. |
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