Effect of yttrium addition on the microstructures and mechanical properties of hypereutectic Al-2OSi alloy

被引:66
作者
Li, Qinglin [1 ,2 ]
Li, Binqiang [1 ]
Li, Jinbao [1 ]
Zhu, Yuqian [1 ]
Xia, Tiandong [1 ,2 ]
机构
[1] Lanzhou Univ Technol, Sch Mat Sci & Engn, Lanzhou 730050, Gansu, Peoples R China
[2] Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Gansu, Peoples R China
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2018年 / 722卷
基金
中国国家自然科学基金;
关键词
Al-20Si alloy; Primary Si; Eutectic Si; Rare earth Y; Mechanical properties; AL-SI ALLOYS; TENSILE PROPERTIES; GRAIN-REFINEMENT; PRIMARY SILICON; HEAT-TREATMENT; MG ALLOYS; PARTICLES; GROWTH; PHASE; EU;
D O I
10.1016/j.msea.2018.03.015
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The effects of Y additions (0.2, 0.4, 0.6, 0.8 and 1.0 wt%) on the microstructure and mechanical properties of hypereutecdc Al-20Si alloy have been studied in the present work. The as-cast specimens were examined by scanning electron microscope (SEM) equipped with energy spectrometer (EDS), electron probe micro-analysis (EPMA) and X-ray diffraction (lCRD). The results demonstrated that the morphology of primary Si could be refined from coarse irregular star-like and plate-like shape to fine block-like when the addition contents of Y increased to 0.8%. The average size of primary Si reduced by 62.9% from 89 pm to 33 pm and the aspect ratio decreased by 38.6% from 2.07 to 1.27. In addition, the eutectic Si structure was modified from coarse needle / flake to fine coral fibrous structure and partial particles. With the refinement and homogenization of Si phases, the optimal elongation (El) increased by 22.5% from 1.13% to 1.36% when the Y content was 0.6%. However, the ultimate tensile strength (UTS) enhanced by 47.9% from 94 MPa to 139 MPa when the addition content of Y was up to 0.8%. Moreover, the refinement and modification mechanism of Y on Al-20Si alloy was also discussed.
引用
收藏
页码:47 / 57
页数:11
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