Microstructure-Property Regulation in a Large-Size Mg-9.4Gd-5.8Y-1Zn-0.5Zr Alloy by Differential Phase Electromagnetic Semi-Continuous Casting and Homogenization
Abstract
Based on a novel semi-continuous casting mold with independent primary cooling regulation, a large-size Mg-9.4Gd-5.8Y-1Zn-0.5Zr alloy billet (Ø330 mm) was successfully fabricated via differential phase electromagnetic vibration casting. This process significantly improved microstructural homogeneity, with grain sizes ranging from 117 µm to 130 µm across the billet and elemental segregation of Gd and Y below 3%. Homogenization at 520 °C for 5 h effectively dissolved grain boundary eutectic phases; promoted diffusion of Gd, Y, and Zn into the α-Mg matrix; and stimulated the precipitation of fine LPSO lamellae. These microstructural improvements resulted in an excellent tensile strength of 208.4 MPa and elongation of 24.4%, demonstrating an optimal strength-ductility balance achieved through precise thermal processing.
Fields of Study & Subjects
Magnesium Alloys: Properties and Applications
Aluminum Alloy Microstructure Properties
Advanced Welding Techniques Analysis
Publication details
- Journal / source
- Materials
- Publisher
- MDPI AG
- Volume
- 19
- Issue
- 2
- Pages
- 282–282
- Publication date
- 9 January 2026
- Language
- EN