中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 35 No. 7 July 2025 |
（1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;
2. Key Laboratory of Nonferrous Metal Alloys and Processing, Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China）
Abstract:Three kinds of Al-5Sr-5Sb modifiers were prepared by permanent mold casting (PMC), controlled diffusion solidification (CDS), and rolling. The influence of the preparation method on Al-5Sr-5Sb was examined by assessing the melting enthalpy from DSC curves and conducting first-principles calculations. Al-5Sr-5Sb was incorporated into AlSi10MnMg alloy to examine the modification effect and mechanism. It is found that the AlSi10MnMg alloy modified with CDS-prepared Al-5Sr-5Sb shows significant improvement in its microstructure, changing the eutectic Si phase from lamellar to coral-like or fiber-like structures. This modification leads to enhanced macroscopic properties: the thermal conductivity is increased by 24.14% to 189.63 W/(m·K), elongation is increased by 59.15% to 10.87%, and tensile strength is increased by 66.9% to 254.98 MPa compared to the unmodified alloy.
Key words: controlled diffusion solidification; modification; AlSi10MnMg; first-principles; thermal conductivity; mechanical properties
