Study on microstructure and thermal conductivity of semi-solid die casting aluminum alloy

¹ School of Rail Transportation, Soochow University, Suzhou, Jiangsu, 215131, China
² School of Iron and Steel, Soochow University, Suzhou, Jiangsu, 215131, China
³ High-performance Metal Structural Materials Research Institute, Soochow University, Suzhou, Jiangsu, 215131, China
⁴ State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, Liaoning, 110819, China

^* Corresponding author: zhanghai888jp@suda.edu.cn

Abstract

In order to improve the comprehensive properties of casting aluminum, and to fulfill the requirements of forming thin wall fins for communication products, mechanical stirring was employed to prepare the semi-solid aluminum alloy AlSi8. communication products were produced by the semi-solid die casting process. The microstructure and mechanical and thermal properties were studied. The test results show that the microstructure of semi-solid die-casting samples changes from dendrite to globular microstructure, and the average tensile strength, elongation and thermal conductivity are 220MPa, 7% and 170 W/(m*K), respectively, which is significantly higher than that of the common die-casting samples. It was proved that the semi-solid die casting technology can be used in actual production and improve the products quality.