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R. Schuster, T. Wojcik, E. Povoden-Karadeniz:
"Deformation Induced Precipitation in Microalloyed Al-Cu";
Talk: Materials Science & Technology 2020 - Online Conference, Pittsburgh; 2020-11-02 - 2020-11-06.

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 CuAl#_2 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 CuAl#_2 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.

Project Head Erwin Povoden-Karadeniz:
CDL-IPE