Abstract
The mechanical behavior of Friction Stir (FS) welds made under the most favorable choice of parameters was determined using tensile tests and was correlated to the microstructures of the FS welded cast Al-Mg-Sc alloy plate and the base metal. FS Zones in the Cast Al-Mg-Sc specimens were much harder than the cast base metal. The global joint fractured in the base metal, and thus possessed greater tensile strength than the base metal. Component part joint samples with lesser gage length failed at the weld nugget. Microstructural evaluation of the alloy plates revealed that due to FS welding, fine and fragmented dynamically recrystallized grains have been formed in the weld nugget. The fine fragmented microstructure of the weld nugget was responsible for better tensile properties than the cast base metal. These results clearly show that FS welding is an optimum/suitable welding process for cast Al-Mg-Sc alloys.
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