Synergistic effect of Sr and La on the microstructure and mechanical properties of A356.2 alloy

被引：73

作者：

Qiu, Chuanrong ^{[1
]}

Miao, Sainan ^{[1
]}

Li, Xinrong ^{[1
]}

Xia, Xingchuan ^{[1
]}

Ding, Jian ^{[1
]}

Wang, Yongning ^{[2
]}

Zhao, Weimin ^{[1
]}

机构：

[1] Hebei Univ Technol, Sch Mat Sci & Engn, Tianjin 300130, Peoples R China

[2] CITIC Dicastal Ltd, Qinhuangdao 066011, Peoples R China

来源：

MATERIALS & DESIGN | 2017年 / 114卷

基金：

中国国家自然科学基金;

关键词：

Al-6Sr-7La master alloy; Modification and grain refinement; Synergistic effect; Mechanical properties; AL-SI ALLOYS; ALUMINUM-ALLOY; MASTER ALLOY; TENSILE PROPERTIES; HEAT-TREATMENT; REFINING EFFICIENCY; GRAIN-REFINEMENT; FOUNDRY ALLOY; PERFORMANCE; COMPOSITES;

D O I：

10.1016/j.matdes.2016.10.061

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In order to investigate the synergistic effect of Sr and La on the microstructure and mechanical properties of A356.2 alloy, Al-6Sr-7La master alloy was fabricated and its microstructure and phase compositions were investigated. The optimal percentage of Al-6Sr-7La in A356.2 alloy was obtained according to the evolution of microstructure and mechanical properties. What's more, to clearly access the refinement and modification performance of Al-6Sr-7La master alloy, untreated and traditionally treated A356.2 alloys (using 0.2 wt% Al-5Ti-1B as refiner and 0.2 wt% Al-10Sr as modifier, respectively) were used for comparison. The results showed that alpha-Al, Al4Sr and Al4La were the main phases in Al-6Sr-7La. In addition, the aluminum alloy with 0.5 wt% Al-6Sr-7La exhibited optimal microstructure and mechanical properties, with the secondary dendrite arm spacing (SDAS) decreasing to 17.9 mu m and acicular-like eutectic silicon transforming to fibrous. Due to the improved microstructure, the ultimate tensile strength, yield strength and elongation of the alloy (with 0.5wt% Al-6Sr-7La) increased to 228.15 MPa, 108.13 MPa and 11.92%, respectively, which are much better than that of traditionally treated A356.2 aluminum alloy. Finally, the grain refinement and modification mechanisms were discussed. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：563 / 571

页数：9

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