Microstructural formation in a hypereutectic Mg-Si alloy
- Key Laboratory of Liquid Structure and Heredity of Materials, Shandong University (southern campus), Jinan 250061 (China)
In the present work, the microstructure of an ingot metallurgy hypereutectic Mg-8 wt.% Si alloy was studied using electron probe microanalysis (EPMA) and the solidification process was discussed. The components of the alloy are Mg{sub 2}Si and Mg. The solidified microstructure of the alloy contains three constituents: Mg{sub 2}Si primary dendrites that are surrounded by Mg sub-primary particles and the Mg-Mg{sub 2}Si eutectic. The primary Mg{sub 2}Si dendrites have a secondary dendrite arm spacing d {sub 2} of approximately 17 {mu}m or show polygonal morphologies with a mean size of 30 {mu}m. An Mg phase appearing as halos surround the Mg{sub 2}Si constituents. The Mg-Mg{sub 2}Si eutectic has a regular morphology of rod-like Mg{sub 2}Si distributed in a continuous matrix of Mg having an interphase spacing r of approximately 0.8 {mu}m.
- OSTI ID:
- 20748773
- Journal Information:
- Materials Characterization, Journal Name: Materials Characterization Journal Issue: 3 Vol. 55; ISSN 1044-5803; ISSN MACHEX
- Country of Publication:
- United States
- Language:
- English
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