Rectilinear dislocation loops are observed to grow in thin foils of mild steel during 1 MeV electron irradiation at 550° C in the beam of a high-voltage electron microscope. A diffraction analysis indicates. that the loops have sides parallel to 〈100〉 directions and are pure edge with a〈100〉 Burgers vector. Only Interstitial-type loops have been identified. The geometry of the loops can be accounted for by an established model of loop nucleation.
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