Intermetallic phase selection during homogenization for AA6082 alloy |
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| Authors: | JH Li A Wimmer G Dehm P Schumacher |
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| Institution: | 1. Chair of Casting Research, Department of Metallurgy, University of Leoben, A-8700 Leoben, Austriajiehua.li@unileoben.ac.at;3. Chair of Casting Research, Department of Metallurgy, University of Leoben, A-8700 Leoben, Austria;4. Department of Materials Physics, University of Leoben, A-8700 Leoben, Austria;5. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, A-8700 Leoben, Austria;6. Max Planck Institute for Iron Research, Max-Planck Society, Düsseldorf, Germany;7. Austrian Foundry Research Institute, A-8700, Leoben, Austria |
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| Abstract: | The intermetallic phase selection during homogenization in a AA6082 alloy has been investigated. A short homogenization treatment at 580?{\degr}C for 4?h and a subsequent slow cooling with a rate of about 8?{\degr}C/min, rather than a conventional quick quenching into water, results in the formation of the rounded discrete Al15(FeMnCr)3Si2 phase, which greatly suppressed the formation of the plate-shaped β-Al5FeSi phase. Most of the Al15(FeMnCr)3Si2 particles were observed to be very fine (about 200?nm) and homogeneously distributed in the α-Al matrix. Fine Mg2Si particles were also observed to be located in the vicinity of Al15(FeMnCr)3Si2 particles. Additionally, the β series precipitates (most likely β″-Mg2Si), large-scale U2-AlMgSi and B′ (type C) phases were also observed within the α-Al matrix. This investigation demonstrates that the size and distribution of the desired intermetallic phases can be influenced by suitable homogenization treatments. |
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| Keywords: | AA6082 alloy homogenization precipitation TEM |
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