Study on hardening mechanisms in aluminium alloys

The Al-Zn-Mg alloys are most commonly used age-hardenable aluminium alloys. The hardening mechanism is\ud further enhanced in addition of Sc. Sc additions to aluminium alloys are more promising. Due to the\ud heterogeneous distribution of nano-sized Al3Sc precipitates hardening effect can be accelerated. Mainly,\ud highlight on hardening mechanism in Al-Zn-Mg alloys with Sc effect is to study. In addition, several\ud characterisations have been done to age-hardening measurements at elevated temperatures from 120oC to 180\ud oC. The ageing kinetics has also been calculated from Arrhenius equation. Furthermore, friction stir processing\ud (FSP) can be introduced to surface modification process and hardened the cast aluminium alloys. In this study,\ud hardening mechanism can be evaluated by Vicker’s hardness measurement and mechanical testing is present\ud task