Homogenization of the interfacial bonding of compound-cast AA7075/6060 bilayer billets by co-extrusion

A process chain of compound casting and co-extrusion of AA7075/6060 bilayer billets is introduced to manufacture hybrid components with strength in the core and good corrosion-resistance in the shell. Using optimized compound casting parameter, metallurgical bonding between the shell AA6060 and the...

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Bibliographic Details
Published in:International journal of material forming 2021-09, Vol.14 (5), p.1109-1119
Main Authors: Chen, Hui, Giannopoulou, Danai, Greß, Thomas, Isakovic, Jonas, Mittler, Tim, Volk, Wolfram, Khalifa, Noomane Ben
Format: Article
Language:English
Subjects:
Aluminum base alloys
Billet casting
Bonding strength
CAE) and Design
Chemical bonds
Coextrusion
Computational Intelligence
Computer-Aided Engineering (CAD
Corrosion resistance
Engineering
Extrusion billets
Homogenization
Hot extrusion
Interfacial bonding
Machines
Manufacturing
Materials Science
Mechanical Engineering
Melting
Metallurgy
Original Research
Process management
Processes
Recrystallization
Shear strength
Substrates
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Summary:A process chain of compound casting and co-extrusion of AA7075/6060 bilayer billets is introduced to manufacture hybrid components with strength in the core and good corrosion-resistance in the shell. Using optimized compound casting parameter, metallurgical bonding between the shell AA6060 and the core AA7075 can be achieved through remelting and recrystallization of the substrate AA7075. The locally unequal thermal conditions at the interface induces partially weak bonding. The bonding strength in greater distance from the casting gate is generally lower. Hot extrusion is applied to improve the interfacial bonding. Comparisons of the microstructure and the shear strength between as-cast billet and extrudate present the homogenization of the interfacial bonding through the process chain.
ISSN:1960-6206
1960-6214
DOI:10.1007/s12289-021-01626-8