About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Lightweight Composites, Materials, and Alloys
|
| Presentation Title |
Co-precipitation behavior and mechanical properties of Al-Mg-Zn-Cu Crossover alloy depending on spark plasma sintering and heat treatment |
| Author(s) |
Dayoung An, Sehun Kim, Se-Eun Shin |
| On-Site Speaker (Planned) |
Dayoung An |
| Abstract Scope |
In this study, an Al–5.5 wt% Mg–5.5 wt% Zn–0.5 wt% Cu (wt%) crossover alloy was designed to combine the formability of 5xxx alloys with the high strength of 7xxx alloys. Densified specimens were fabricated by spark plasma sintering (SPS) and subsequently subjected to T6 heat treatment to investigate precipitation behavior and mechanical properties. Microstructural analysis revealed that Mg–Zn–Cu segregation at grain boundaries in the as-sintered state transformed into fine and uniformly distributed intragranular precipitates after T6 treatment. Precise control of the Zn/Mg ratio (~1) promoted dominant T′ (Mg₃₂(Al, Zn)₄₉) formation with concurrent η′ precipitation. This precipitate combination enhanced strengthening while mitigating galvanic corrosion. The crossover alloy exhibited superior hardness, elastic modulus, and compressive strength compared to conventional 7xxx alloys. The improved properties are attributed to the combined effects of shearing (T′) and Orowan (η′) strengthening with a homogeneous microstructure induced by SPS. |