About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Aluminum Alloys, Processing and Characterization
|
Presentation Title |
Development of High-strength 6xxx Aluminium Nanocomposites by Direct-chill Casting and Thermo-mechanical Processing |
Author(s) |
Guangyu Liu, Mahfuz Karim, Dmitry Eskin, Brian McKay |
On-Site Speaker (Planned) |
Guangyu Liu |
Abstract Scope |
Wrought aluminium alloys reinforced with ceramic particles have been extensively investigated for automotive applications due to their high specific strength. This study aims to push the limits of the strength of existing commercial high-strength 6xxx aluminium alloys (YS>340MPa) by incorporating ceramic reinforcing nanoparticles. Aluminium billets containing ~1wt% Al2O3 nanoparticles (<80 nm) are direct-chill cast and subsequently subjected to thermo-mechanical processing. Instead of adding loose Al2O3 nanoparticles directly to the melt, Al-20wt.%nanoAl2O3 alloys produced by high energy ball milling has been employed to aid their introduction. Stir mixing and ultrasonic processing techniques were applied to further enhance the dispersion of nanoparticles. The effect of the nanoparticles and the heat treatment on the microstructure with respect to casting defects, particles distributions and particle/matrix bonding have been thoroughly analysed. The microstructure and the mechanical properties of the thermo-mechanically processed composite billets are investigated in comparison with the benchmark alloys. |
Proceedings Inclusion? |
Planned: Light Metals |