| Summary: | The influence of solid solution treatment on the microstructure and corrosion resistance of as-cast Mg95.5Zn1.5Y3 alloy is characterized. The microstructure of the as-cast Mg95.5Zn1.5Y3 alloy mainly consisted of α-Mg, W (Mg3Zn3Y2) phase, and the long period stacking ordered (LPSO) (Mg12ZnY) phase. After solid solution treatment, most of the W phase disappears gradually with increasing solution treatment time, with only a small amount of W phase distributed as particle. The LPSO phase slightly dissolved into substrate, and its morphology transitions from blocky shape to rod shape. Solid solution treatment of Mg95.5Zn1.5Y3 exhibits excellent corrosion resistance, because the Y and Zn atoms became enriched in the matrix and the changed morphologies of the LPSO and W phases were modified through heat treatment. The alloy created with solid solution treatment at 520 °C for 10 hours exhibits corrosion potential of −1.419 V, suggesting a significant improvement in corrosion performance. Keywords: Magnesium alloys, LPSO phase, Solid solution treatment, Corrosion resistance
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