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- Title
Microstructural Aspects of Second Phases in As-cast and Homogenized 7055 Aluminum Alloy with Different Impurity Contents.
- Authors
She, Huan; Shu, Da; Chu, Wei; Wang, Jun; Sun, Baode
- Abstract
The microstructural factors such as type, area fraction, morphology, distribution, and size of second phases in as-cast and homogenized 7055 aluminum alloy and the influence of impurity content variations have been investigated by using optical microscope (OM), scanning electron microscope (SEM), energy dispersive X-ray analysis (EDS), and X-ray diffraction (XRD). In as-cast microstructures, the dominant second phases of η [Mg(Al, Cu, Zn)] with extended solubility of Cu and Al, a small amount of impurity phases of AlCuFe and AlFe with a little solubility of Cu and Si, and trace MgSi are identified. The variations of Fe and Si contents have no significant influence on the area fraction of η phases, but the area fraction of Fe-rich phase decreases from 0.231 to 0.102 pct with Fe content decreasing from 0.080 to 0.038 wt pct. Decreasing Fe contents reduces the size parameters of Fe-rich phases and refines their morphology correspondingly. After being homogenized at 753 K (480 °C) for 24 hours, η phases are largely dissolved, but the coarse impurity phases are insoluble. Compared with as-cast microstructures, the area fraction and composition of Fe-rich phases change a little but their morphologies are slightly coarsened.
- Subjects
ALUMINUM alloys; METAL microstructure; METAL castings; X-ray diffraction; PARTICLE size distribution; SCANNING electron microscopes; PHASE transitions
- Publication
Metallurgical & Materials Transactions. Part A, 2013, Vol 44, Issue 8, p3504
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-013-1709-8