| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Thermodynamic Properties, Structure and Phase Stabilities of Special Alloys
|
| Presentation Title |
Deformation Induced Precipitation in Microalloyed Al-Cu |
| Author(s) |
Roman Schuster, Tomasz Wojcik, Erwin Povoden-Karadeniz |
| On-Site Speaker (Planned) |
Roman Schuster |
| Abstract Scope |
Alloying aluminum with Cu leads to an enhancement of mechanical properties compared to pure aluminum through the formation of intermetallic precipitates during aging treatment. To minimize costs, a reduced Cu concentration compared to 4 wt% in the 2000 alloy series, while still retaining enhanced mechanical strength, may be preferred for many applications. In this communication we report on the precipitation of CuAl2 θ from a solid solution with less than 1 wt% Cu through processing involving severe plastic deformation. Deformation by high pressure torsion at room temperature and 150°C leads to ultra-fine grained microstructures with grain sizes well below 500 nm at room temperature and about 500 nm at 150°C. TEM analysis reveals the formation of 10-40 nm sized CuAl2 θ precipitates at triple points and Cu enrichment at grain boundaries. Furthermore, the grain interiors exhibit a heterogeneous Cu distribution in the nano-scale showing lamellar regions with enhanced Cu concentration. |