Characterization of a Mg95.5Zn1.5Y3 alloy both containing W phase and LPSO phase with or without heat treatment

Authors: Zhumin, L., Diqing, W., Yi, H., Shuting, Y. and Yinglin, H.

Journal: Journal of Magnesium and Alloys

Volume: 5

Issue: 2

Pages: 217-224

ISSN: 2213-9567

DOI: 10.1016/j.jma.2017.05.003

Abstract:

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.

Source: Scopus