An Al-12Si/ZnS powder inoculant for eutectic silicon in Al-12Si alloy  

作　　者：Ying Wang Pan-yu Chen Yu-hui Lin Mei Zhao Cheng-dong Li 

机构地区：[1]College of Materials Science and Engineering,Qingdao University of Science&Technology,Qingdao 266042,China

出　　处：《China Foundry》2022年第2期149-157,共9页中国铸造（英文版）

基　　金：the financial support from the National Natural Science Foundation of China (Grant No. 51672145)

摘　　要：To obtain high-performance Al-Si-based cast alloys,refinement and modification of Si phases are required.An Al-12Si/ZnS powder inoculant was designed and fabricated using a chemical bath deposition method.The efficiency of the inoculant for modifying the eutectic Si phase in as-cast Al-12Si alloy was studied.Results show that Al-12Si/ZnS powder can significantly refine the eutectic Si in Al-Si cast alloys.The best refinement effect for eutectic Si is achieved with 17.5wt.%Al-12Si/ZnS powder.Coarse long needle-shaped eutectic Si with a length of 18μm was modified into approximately spherical shape with a diameter of 6.53μm,which is evenly distributed throughout the alloy.The E2EM model calculation indicates that the inter-plane misfit(F_(p))and inter-atomic spacing misfit(F_(r))between ZnS and Si are all less than 0.5%,which confirms that ZnS is a potential nucleation site for Si phase.The hardness,tensile strength,and elongation of Al-12Si alloys modified with 17.5%Al-12Si/ZnS powder increase 6.30%,16.18%and 55.45%,respectively,compared to the unmodified Al-12Si alloy.The fracture behavior of the alloy with 17.5wt.%Al-12Si/ZnS powder is dominated by transgranular fracture supplemented by intergranular fracture.

关 键 词：AL-SI Al-Si/ZnS REFINEMENT eutectic silicon 

分 类 号：TG146.21[一般工业技术—材料科学与工程]