Microstructural characterization and mechanical properties of high power ultrasonic spot welded aluminum alloy AA6111–TiAl6V4 dissimilar joints

Aluminum alloy AA6111 and TiAl6V4 dissimilar alloys were successfully welded by high power ultrasonic spot welding. No visible intermetallic reaction layer was detected in as-welded AA6111/TiAl6V4 welds, even when transmission electron microscopy was used. The effects of welding time and natural agi...

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Bibliographic Details
Published in:Materials characterization 2014-11, Vol.97, p.83-91
Main Authors: Zhang, C.Q., Robson, J.D., Ciuca, O., Prangnell, P.B.
Format: Article
Language:English
Subjects:
AGING
Aging (natural)
ALUMINIUM
ALUMINIUM ALLOYS
Aluminum
Aluminum base alloys
Applied sciences
Cross-disciplinary physics: materials science
rheology
Dissimilar welding
Exact sciences and technology
Fracture mechanics
Fracture toughness
FRACTURES
INTERFACES
Intermetallic layer
Joining, thermal cutting: metallurgical aspects
LAYERS
MATERIALS SCIENCE
Mechanical properties
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
MICROSTRUCTURE
Peak load
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
SHEAR PROPERTIES
Solidification
TITANIUM
TITANIUM ALLOYS
TRANSMISSION ELECTRON MICROSCOPY
ULTRASONIC WELDING
VANADIUM ALLOYS
WELDED JOINTS
Welding
YIELD STRENGTH
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Summary:Aluminum alloy AA6111 and TiAl6V4 dissimilar alloys were successfully welded by high power ultrasonic spot welding. No visible intermetallic reaction layer was detected in as-welded AA6111/TiAl6V4 welds, even when transmission electron microscopy was used. The effects of welding time and natural aging on peak load and fracture energy were investigated. The peak load and fracture energy of welds increased with an increase in welding time and then reached a plateau. The lap shear strength (peak load) can reach the same level as that of similar Al–Al joints. After natural aging, the fracture mode of welds transferred from ductile fracture of the softened aluminum to interfacial failure due to the strength recovery of AA6111. •Dissimilar Al/Ti welds were produced by high power ultrasonic spot welding.•No visible intermetallic reaction layer was detected on weld interface.•The lap shear strength can reach the same level as that of similar Al–Al joints.•The fracture mode becomes interfacial failure after natural aging.
ISSN:1044-5803
1873-4189
DOI:10.1016/j.matchar.2014.09.001