Evolution of Oxide Structures in Friction Stir Welded Alloy MA956
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Oxide dispersion strengthened alloys are of great potential importance for advanced fission and fusion reactors because of their high temperature strength, creep resistance, and radiation damage resistance. Unfortunately, these materials are not readily joined by fusion welding as the dispersed oxides agglomerate and coarsen in the weld pool, thus drastically reducing the strength of the welded material. Friction stir welding (FSW) can successfully join these materials through a solid-state bonding process, but there is still some reduction in strength due to evolution of the oxide structure. This paper examines the changes in oxide size and phase as a function of FSW parameters in the alloy MA956.
The article of record as published may be found at https://doi.org/10.1017/S1431927615004572
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