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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 150C leads to ultra-fine grained microstructures with grain sizes well below 500 nm at room temperature and about 500 nm at 150C. 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.


Deformation Induced Precipitation in Microalloyed Al-Cu
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