About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Aluminum Alloys, Processing and Characterization
|
Presentation Title |
Microstructural Evolution of High Zn 7000-series Aluminum Alloy with Addition of Titanium |
Author(s) |
Kwangjun Euh, Jae-Gil Jung, Sang-Hwa Lee, Se-Hun Kim |
On-Site Speaker (Planned) |
Kwangjun Euh |
Abstract Scope |
The effects of Ti addition on the microstructural evolution and mechanical properties of high-Zn aluminum alloy were investigated at each process step such as casting, extrusion, solution treatment and aging. Addition of titanium causes refinement of both the grains and bulky η-Mg(Zn,Cu,Al)2 particles in the as-cast alloys. After hot extrusion, the Ti-added alloy has increased amount of recrystallized grains by particle-stimulated nucleation, decreasing the strength of as-extruded alloy. Titanium addition causes size decrease of L12 precipitates and increases the number density of them while substituting Zr site with Ti, that is, (Al,Zn)3(Zr,Ti). Besides, Al18Mg3Ti2 phase is formed by Ti addition during solution treatment, which acts as a heterogeneous nucleation of η precipitate. The strength of the aged alloys is improved by the formation of fine L12 precipitates, grain refinement and the refinement of bulky η-phases. |
Proceedings Inclusion? |
Planned: Light Metals |
Keywords |
Aluminum, Characterization, |