Review of Effect of Heat Treatment on Microstructure and Properties of Al-Si Alloy
YANG Wentao1,2, HE Pengfei2, LIU Ming2, ZHOU Yongxin1, WANG Haidou2, BAI Yu3, LI Qing4
1 School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710072, China 2 National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing 100072, China 3 School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China 4 Shandong United Energy Pipeline Transportation Co., Ltd., Yantai 264006,Shandong, China
Abstract: Al-Si alloy is widely used in the fields of automobile and aircraft structural parts, electronic product packaging, precision instrument processing and so on, because of its good casting performance, high specific strength and low coefficient of thermal expansion. Its various applications in various fields are due to the influence of thermal history on its microstructure, resulting in the corresponding performance bias. At the same time, the heat treatment process also has a significant impact on the properties of Al-Si alloy. A large number of studies show that this impact is mainly achieved by changing the morphology and size of eutectic silicon and primary silicon, or changing the precipitating of alloying elements and so on, and these changes are also reflected when the alloy compositions and preparation processes changed. In fact, the effect of different heat treatment methods on the properties of Al-Si alloy with different microstructure is also varied. The precipitation after heat treatment has a great influence on the hardness of Al-Si alloy, and its distribution is related to the toughness of Al-Si alloy; the spheroidization of silicon phase after heat treatment can improve the strength and wear resistance of Al-Si alloy. But the increase of the size of silicon phase will lead to the decrease of wear resistance of the alloy. The changes of microstructure and properties of Al-Si alloy are corresponding to each other. By exploring and summarizing the microstructure evolutions of Al-Si alloy after heat treatment, the change of its properties can be predicted qualitatively. In this paper, the influence trends of heat treatment on hardness, strength and toughness, tribological properties and thermophysical properties of various Al-Si alloys are reviewed. It is consistent with the microstructure evolutions of T1, T4, T5, T6, annealing and other heat treatment processes, so as to analyze the influence mechanism. At the same time, the above properties of Al-Si alloy after heat treatment were classified, summarized and compared in order to facilitate the selection of different heat treatment processes according to different performance requirements.
杨文涛, 何鹏飞, 刘明, 周永欣, 王海斗, 白宇, 李青. 热处理工艺对铝硅合金显微组织和性能影响的研究现状[J]. 材料导报, 2022, 36(11): 20080038-9.
YANG Wentao, HE Pengfei, LIU Ming, ZHOU Yongxin, WANG Haidou, BAI Yu, LI Qing. Review of Effect of Heat Treatment on Microstructure and Properties of Al-Si Alloy. Materials Reports, 2022, 36(11): 20080038-9.
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2022, Vol. 36 
