SEDL / STP / STP1125-EB / STP17885S

The Interaction of Point Defects with Line Dislocations in HVEM Irradiated Fe-Ni-Cr Alloys

King, SL
Doctor of Philosophy student and senior research fellow, University of Oxford, Oxford,

Jenkins, ML
Doctor of Philosophy student and senior research fellow, University of Oxford, Oxford,

Kirk, MA
Metallurgist, Argonne National Laboratory, Argonne, IL

English, CA
Principal scientific officer, Harwell Laboratory, Didcot, Oxon

Pages: 15    Published: Jan 1992

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Abstract

This paper presents results of a study of the interaction of point defects, produced by electron irradiation conducted m a high-voltage electron microscope (HVEM), with preexisting dislocations in austemtic Fe-15% and 25%Ni-17%Cr alloys, aimed at the determination of the climb mechanisms of dissociated dislocations Dislocations were initially characterized at subthreshold voltages (here 200 kV) using the weak-beam technique These dislocations were then irradiated with 1-MeV electrons in the Argonne HVEM before being returned to a lower voltage microscope for postirradiation characterization Interstitial climb was seen only at particularly favorable sites, such as preexisting jogs, while vacancies clustered near dislocations, forming stacking fault tetrahedra (SFT). Partial separations were also observed to have decreased after irradiation. The postirradiation dislocation configuration was found to depend strongly on both dislocation character and preirradiation dislocation configuration. These results and their relevance to the void swelling problem are discussed.