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Microstructural Aspects of Second Phases in As-cast and Homogenized 7055 Aluminum Alloy with Different Impurity Contents

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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)2] with extended solubility of Cu and Al, a small amount of impurity phases of Al7Cu2Fe and Al3Fe with a little solubility of Cu and Si, and trace Mg2Si 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.

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Acknowledgments

The authors would like to thank the financial support from the National Basic Research Program of China (No. 2012CB619505) and the National Natural Science Foundation of China (No. 51174135).

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Authors and Affiliations

  1. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China

    Huan She (Doctoral Student), Da Shu (Associate Professor), Wei Chu (Master Student), Jun Wang (Professor) & Baode Sun (Professor)

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  1. Huan She
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  2. Da Shu
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  3. Wei Chu
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  4. Jun Wang
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  5. Baode Sun
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Correspondence to Da Shu.

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Manuscript submitted November 20, 2012.

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She, H., Shu, D., Chu, W. et al. Microstructural Aspects of Second Phases in As-cast and Homogenized 7055 Aluminum Alloy with Different Impurity Contents. Metall Mater Trans A 44, 3504–3510 (2013). https://doi.org/10.1007/s11661-013-1709-8

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