The effect of scandium addition on microstructure and mechanical properties of Al-Si-Mg alloy: A multi-refinement modifier

被引：117
作者：
Xu, Cong [1 ]
Xiao, Wenlong [1 ]
Hanada, Shuji [2 ]
Yamagata, Hiroshi [3 ]
Ma, Chaoli [1 ]
机构：
[1] Beihang Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Aerosp Adv Mat & Performance, Beijing 100191, Peoples R China
[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
[3] Gifu Univ, Ctr Adv Engn & Technol, Gifu, Gifu 5011193, Japan
来源：
MATERIALS CHARACTERIZATION | 2015年 / 110卷
基金：
对外科技合作项目（国际科技项目）;
关键词：
Scandium; Microstructure; Mechanical properties; Multi-refining efficiency; Fracture; HEAT-TREATMENT; SOLIDIFICATION BEHAVIOR; IRON-INTERMETALLICS; TENSILE PROPERTIES; SC ADDITIONS; ALUMINUM; STRENGTH; SILICON; CU; MORPHOLOGY;
D O I：
10.1016/j.matchar.2015.10.030
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Effect of scandium (Sc) additions on the microstructure, mechanical properties and fracture behavior of Al-Si-Mg casting alloy (F357) were systematically investigated. It was found that Sc addition caused a multi-refining efficiency on the microstructure of as-cast F357 alloy, including refinement of grains and secondary dendrite arm spacing (SDAS), modification of eutectic Si and harmless disposal of beta-Al5FeSi phase. Subsequent T6 heat treatment had further induced the complete spheroidization of eutectic Si and precipitation of fine secondary Al3Sc dispersoids in the Sc modified alloys. Thus the mechanical properties, especially the ductility, were significantly enhanced by the addition of Sc combined with the heat treatment. The highest ultimate tensile strength, yield strength and elongation were achieved in 0.8 wt%Sc modified F357 alloy combined with T6 heat treatment Furthermore, fractographic examinations indicated that the ductile fracture mechanism served as a dominate role in the modified alloys due to the formation of fine, deep and uniformly distributed dimples. (C) 2015 Elsevier Inc. All rights reserved.
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页码：160 / 169
页数：10
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