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Accession Number:
ADA583559
Title:
Microstructural Characterization of Friction Stir Welded Aluminum-Steel Joints
Descriptive Note:
Master's thesis
Corporate Author:
WASHINGTON STATE UNIV PULLMAN
Report Date:
2013-08-01
Pagination or Media Count:
115.0
Abstract:
This work focuses on the microstructural characterization of aluminum to steel friction stir welded joints. A lap weld configuration, coupled with scribe technology used for the weld tool, have produced joints of adequate quality, despite the significant differences in hardness and melting temperatures of the alloys. Common to friction stir processes, especially those of dissimilar alloys, are microstructural gradients including grain size, crystallographic texture, and precipitation of intermetallic compounds. Because of the significant influence that intermetallic compound formation has on mechanical and ballistic behavior, the characterization of the specific intermetallic phases and the degree to which they are formed in the weld microstructure is critical to predicting weld performance. This study used electron backscatter diffraction, energy dispersive spectroscopy, optical and scanning electron microscopy, and Vickers micro-hardness indentation to explore and characterize the microstructures of lap friction stir welds between 6111-T4 aluminum and dual phase galvannealed steel, as well as an applique 6061-T6 aluminum armor plate alloy and a wrought homogeneous armor plate steel alloy.
Distribution Statement:
APPROVED FOR PUBLIC RELEASE
