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李庆林,住玉乾,李进宝,李斌强,刘建军,刘德学,兰晔峰,夏天东.Yb和Al-Ti-B复合变质对过共晶Al-Si铸造合金组织和性能的影响[J].稀有金属材料与工程(英文),2020,49(6):1915~1924.[Liqinglin,Zhuyuqian,Lijinbao,Libinqiang,Liujianjun,Liudexue,Lanyefeng and Xiatiandong.Influence of Yb and Al-Ti-B complex modification on the microstructure and performance of hypereutectic Al-Si casting alloys[J].Rare Metal Materials and Engineering,2020,49(6):1915~1924.]
Influence of Yb and Al-Ti-B complex modification on the microstructure and performance of hypereutectic Al-Si casting alloys
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Received:February 27, 2019  Revised:April 24, 2019
DOI:
Key words: hypereutectic Al-20Si alloy  primary Si  eutectic Si  rare earth Yb  Al-5Ti-1B refiner  mechanical properties
Foundation item:国家自然科学基金项目(51561021)
Author NameAffiliation
Liqinglin,Zhuyuqian,Lijinbao,Libinqiang,Liujianjun,Liudexue,Lanyefeng and Xiatiandong  
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Abstract:
      In this study, the microstructure evolution and mechanical properties of hypereutectic Al-20Si alloy containing rare earth Yb and Al-5Ti-1B refiner were investigated. The microstructures of the samples were characterized by optical microscopy, scanning electron microscopy, and electron probe microanalysis. Microstructural analysis demonstrated that the primary Si was significantly refined from a coarse polygonal, platelet-like or star-like shape into a fine blocky shape; the eutectic Si structure was modified from a coarse platelet-like/needle-like structure into fine particles or a fibrous structure; and the coarse α-Al dendrites were refined into fine equiaxed dendrites after the addition of 0.5% Yb and 0.3% Al-5Ti-1B complex. However, the primary and eutectic Si phases became coarser when the content of Al-5Ti-1B refiner reached 0.4%. The mechanical properties of the Al-20Si alloy with different modifiers and different modifier concentrations were investigated with the tensile test. The results showed that the ultimate tensile strength and elongation of the prepared sample increased by 83.7% and 92.1%, respectively.