Oxide dispersion strengthened (ODS) alloys are considered an important class of structural materials for various high temperature applications including advanced nuclear reactors. Conventional fusion welding methods lead to high porosity and agglomerated oxide particles in these alloys deteriorating critical properties of the joint. That is why solid state joining techniques are touted as the potential remedy for the welding issues encountered in these alloys. Research activities in an ongoing research program supported by the DOE (grant # DEFG07-08ID14925) are highlighted. In this program, friction stir welding and pressure resistance welding have been used to successfully weld various ODS alloys, such as MA956, MA957 and MA754. Microstructural characteristics of the welded alloys are studied using a host of microscopy techniques. Mechanical properties are evaluated using microhardness, miniaturized tensile and shear punch test techniques. Appropriate microstructure-property correlations are developed. An overview of the state-of-the-art based on the published literature is also presented.
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