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- Title
Numerical Study of Microstructural Evolution During Homogenization of Al-Si-Mg-Fe-Mn Alloys.
- Authors
Priya, Pikee; Johnson, David; Krane, Matthew
- Abstract
Microstructural evolution during homogenization of Al-Si-Mg-Fe-Mn alloys occurs in two stages at different length scales: while holding at the homogenization temperature (diffusion on the scale of the secondary dendrite arm spacing (SDAS) in micrometers) and during quenching to room temperature (dispersoid precipitation at the nanometer to submicron scale). Here a numerical study estimates microstructural changes during both stages. A diffusion-based model developed to simulate evolution at the SDAS length scale predicts homogenization times and microstructures matching experiments. That model is coupled with a Kampmann Wagner Neumann-based precipitate nucleation and growth model to study the effect of temperature, composition, as-cast microstructure, and cooling rates during posthomogenization quenching on microstructural evolution. A homogenization schedule of 853 K (580 °C) for 8 hours, followed by cooling at 250 K/h, is suggested to optimize microstructures for easier extrusion, consisting of minimal α-Al(FeMn)Si, no β-AlFeSi, and MgSi dispersoids <1 μm size.
- Subjects
ALUMINUM alloy metallurgy; HEAT treatment of aluminum alloys; ALUMINUM alloy deterioration; METALLIC composites; MICROALLOYING
- Publication
Metallurgical & Materials Transactions. Part A, 2016, Vol 47, Issue 9, p4625
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-016-3610-8