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Magnesium single crystals were irradiated to 2.1 × 1021 neutrons (n)/cm2 (E > 0.1 MeV) near 450 K, one set of specimens being under a compressive stress of 80 MPa applied in the c-direction. A transmission electron microscopy (TEM) investigation of the crystals irradiated under load showed that the neutron damage consisted of dislocation loops. Under in situ electron irradiation in the TEM at 200 kV, some of these loops were observed to shrink. It was deduced that the shrinking loops were of the vacancy type, which is consistent with theoretical predictions  of the influence of an external compressive stress on dislocation loop formation during irradiation.
radiation, radiation damage, dislocation loops, magnesium, transmission electron microscopy
Guest scientist, Institut für Material- und Festkörperforschung IIWestinghouse Research and Development Center, KarlsruhePittsburgh, Pa.