Affiliation:
1. General Research Institute for Nonferrous Metals
2. Gerenal Research Institute for Nonferrous Metals
Abstract
The microstructures of AA6111 automotive aluminum alloy were investigated by optical microscopy (OM), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), differential scanning calorimetry (DSC), X-ray diffraction analysis (XRD) and transmission electron microscope (TEM). The results indicated that as-cast AA6111 alloy has a complex microstructure. There were many kinds of intermetallic phases, such as lath-shaped β-Al5FeSi, Al15(FeMn)3Si2and Mg2Si on the grain boundaries. The Al5Cu2Mg8Si6precipitates presented non-equilibrium eutectic morphology in the grain interiors. After homogenization treatment (6h at 470), the low melting point Mg2Si phase began dissolving. The eutectic Al5Cu2Mg8Si6phase were dissolved completely after 530/24h homogenization treatment. The Al15(FeMn)3Si2phase started to be spheroidized at 560. Increasing treatment temperature will promote Mn to substitute for Fe in this phase.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
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