Nanocrystalline structural layer acts as interfacial bond in Ti/Al dissimilar joints produced by friction stir welding in power control mode

• Published in: Scripta materialia Vol. 174; pp. 80 - 86
• Main Authors: Pereira, Victor F., Fonseca, Eduardo B., Costa, Alex M.S., Bettini, Jefferson, Lopes, Eder S.N.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-01-2020
• Subjects: Friction stir welding; Nanocrystalline structure; Scanning/transmission electron microscopy (STEM); Transmission electron microscopy (TEM); Nanocrystalline structure; Scanning/transmission electron microscopy (STEM); Transmission electron microscopy (TEM); Friction stir welding
• ISSN: 1359-6462; 1872-8456
• DOI: 10.1016/j.scriptamat.2019.08.031

One of the main drawbacks of welding dissimilar metal alloys is the potential massive precipitation of deleterious intermetallic compounds that occurs at the interface joint. Solid-state welding processes are therefore attractive, given the lower temperatures involved. In this work, dissimilar high strength aluminum and titanium alloys were friction-stir-welded using the spindle power control mode to reduce the heat input at the joint as much as possible. A microstructural characterization indicated that the chosen parameters (heat input of ~0.5 kJ/mm) produced welded joints without spatially continuous layers of deleterious intermetallic compounds.
[Display omitted]