TY  - JOUR
AU  - Huang, Jinhui
AU  - Liu, Shuhong
AU  - Liu, Zheyuan
AU  - Che, Xuezhen
AU  - Friák, Martin
AU  - Du, Yong
PY  - 2026
TI  - Refinement of Mg2Si in Mg-Al-Si alloys through Ca and Y additions: A novel core-shell structure evolution mechanism and enhanced mechanical properties
JO  - Journal of Magnesium and Alloys
SN  - 2213-9567
VL  - 16
IS  - C
AB  - Comprehensive experimental and theoretical investigations on microstructure and mechanical properties were conducted to explore the refinement of Mg2Si in Mg-Al-Si alloys through the addition of Ca and Y. Alloys of Mg-Al5.5-Si9.5-Cax (x = 0, 0.05, 0.1, 0.15, wt.%) and Mg-Al5.5-Si9.5-Yx (x = 0, 0.3, 0.6, 0.9, wt.%) were designed based on the CALPHAD (CALculations of PHAse Diagram) calculations and literature data. With the experimentally determined optimal individual addition of 0.1 wt.% Ca and 0.9 wt.% Y respectively, a cross-experiment involving simultaneous addition of Ca and Y for the refinement of Mg2Si was carried out. The alloy composition with the optimal refinement effect and mechanical properties was identified as Mg-Al5.5-Si9.5-Ca0.1-Y0.6 (wt.%). In Y-containing alloys, a novel core-shell structure evolution mechanism of MgSi2Y2//Al4MgY//Mg2Si was proposed based on experimental observation and first principles calculations, revealing MgSi2Y2 as the core for the heterogeneous nucleation of Mg2Si.
UR  - https://doi.org/10.1016/j.jma.2025.03.008
DO  - 10.1016/j.jma.2025.03.008