Scientific Research and Practice on the Machinable Hypereuteetic Al-Si Alloys Material 891189
This paper studies systematically the machinability -of Al-18-20%Si hypereutectic alloy. The results indicate: in squeeze casting, adopting high temperature pouring, high cooling Speed, single-modificating with p and T6 heat treating can make this material free cutting only using common carbide tool. Furthermore, the automobile pistons of this material can be produced in batches.
The single-modlficating with p in squeeze casting may refine the crystals of primary si to 25 urn below and the eutectic si can also be refined and spheroidized. Therefor, pistons of Al-18%si alloy have excellent mechanical and physical properties.
This paper discusses and analyzes the growth morphology and mechanism of si crystals.
Xie Zhichso, Hu Hua, Zhao Yutao
Jian Su Institute of Technology, China
5th International Pacific Conference on Automotive Engineering