Abstract
The effect of small additions of Sc and Zr on phase transformations, microstructure and hardening during the ageing of AA5754 alloy was studied. Electrical resistometry and hardness (HV10) measurements were used together with the microstructural study by transmission electron microscopy. A fine dispersion of spherical Al 3(Sc x Zr 1− x ) particles precipitated after the conventional thermal and mechanical treatment (homogenization 450 °C/4 h, hot working at 420 °C and cold working). The decomposition sequence of Al-Mg-Si system was observed, namely, metastable β″→metastable β′→ stable β phase, after the solutionizing treatment 585 °C/15 h and following isochronal annealing. Simultaneously, a stable Al 3(Sc x Zr 1− x ) spherical phase precipitated in cube-to-cube orientation. The pronounced age hardening at 240 °C is due to the metastable β″ phase precipitation. A combination of Al 3(Sc x Zr 1− x ) spherical particles and cuboids of stable β phase lead to another age-hardening peak at 360 °C.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
