Determination of the Nature of Neutron Irradiation-Induced Dislocation Loops in Magnesium Using Electron Irradiation in the Transmission Electron Microscope

A Wolfenden

doi:10.1520/STP38154S

SYMPOSIA PAPER Published: 01 January 1979

STP38154S

Determination of the Nature of Neutron Irradiation-Induced Dislocation Loops in Magnesium Using Electron Irradiation in the Transmission Electron Microscope

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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 [1] of the influence of an external compressive stress on dislocation loop formation during irradiation.

Author Information

Wolfenden, A

Westinghouse Research and Development Center, Pittsburgh, Pa., Germany

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Details

Developed by Committee: E10

Pages: 5–11

DOI: 10.1520/STP38154S

ISBN-EB: 978-0-8031-5551-0

ISBN-13: 978-0-8031-0327-6

Determination of the Nature of Neutron Irradiation-Induced Dislocation Loops in Magnesium Using Electron Irradiation in the Transmission Electron Microscope

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