Abstract
Microstructures and swelling have been studied for a series of high-strength, high-conductivity rapidly solidified (RS) powder metallurgy (PM) alloys and oxide dispersion alloys which were neutron irradiated to 13.5 dpa at 400°C. Another article of these proceedings presents results for irradiation-induced changes in electrical conductivity, mechanical strength and ductility. The RS-PM alloys include Cu-Mg-Zr-Cr (MZC) and two oxide dispersion stabilized (ODS) alloys, Cu-Zr-ZrO 2 and Cu-Zr-Cr-ZrO 2 . Ingot materials and pure copper were also studied for comparison purposes. All alloys show no significant swelling after irradiation except OFHC pure copper, which exhibited 7.0% swelling. For the ODS alloys, TEM microstructures show stable fine oxide pinning of grain and subgrain boundaries as well as dislocations. In addition to fine oxides, a large amount of very fine metallic and intermetallic precipitation was observed within the grains.
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