|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||D-54: Strengthening Behaviour of Al-Si Alloy Containing Oxygen Atoms
||Jeheon Jeon, Donghyun Bae
|On-Site Speaker (Planned)
Strengthening strategies on Al-Si alloy systems inevitably include sacrifice of ductility in conventional metallic alloy design. Here, we report a new way to overcome the strength-ductility trade-off dilemma through a non-metallic alloying method in which a large number of non-metal atoms (O) are introduced in the Al matrix. The introduction of O atoms not only reduces secondary dendrite arm spacing in solidification, but also contributes to spheroidization of Si phase during heat treatment. Furthermore, form a dispersed nano-scale Si rich phase with favourable interface in Al matrix, leading to high strength without decreasing ductility. The non-metallic alloying method to conventional commercial alloy (i.e., A356) significantly improves their mechanical properties, increasing their ultimate tensile strength and the elongation to fracture by 36.0% and 37.5%, respectively, compared to the those of A356 alloy.
||Planned: Light Metals