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Recrystallization Performance of AA7050 Varied with Sc and Zr
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2000
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Materials ScienceMaterials EngineeringZr AdditionsEngineeringSc ContentMechanical EngineeringApplied PhysicsAlloy DesignElements ScHot WorkingSolid MechanicsRecrystallization PerformanceAlloy PhaseThermomechanical ProcessingMechanics Of MaterialsMicrostructureAlloys
The elements Sc and Zr are known to impart increased recrystallization resistance in aluminum alloys by employing Al 3 Sc and Al 3 Zr dispersoids, respectively. Developing elevated recrystallization temperatures in wrought aluminum alloys is important for the retention of mechanical properties developed during thermo-mechanical processing. The interactions of Sc and Zr additions in precipitation hardenable 7xxx alloys are studied in this work. Of the two dispersoids mentioned, only Al 3 Zr is used in some 7xxx alloys. We show that the use of both Sc and Zr in 7050 is more effective than Zr acting alone. Emphasis is given to the evolution of microstructure as affected by Sc content, Zr content, homogenization, hot rolling, and annealing. The results of optical microscopy, TEM, and EDS are included in this work.