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Effect of Micro-Alloying Element La on Solidification Microstructure and Mechanical Properties of Hypoeutectic Al-Si Alloys
Zheng Qiuju1,2; Ye Zhongfei3; Jiang Hongxiang1; Lu Ming3; Zhang Lili1; Zhao Jiuzhou1,2
Corresponding AuthorZhao Jiuzhou(jzzhao@imr.ac.cn)
2021-01-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume57Issue:1Pages:103-110
AbstractHypoeutectic Al-Si alloys are extensively used in the welding industry owing to their excellent cast-ability, low coefficient of thermal expansion, and good weldability. Unfortunately, Al-Si alloys solidify under conventional cooling conditions, forming coarse dendritic alpha-Al grains with an eutectic structure and a flake-like morphology that has poor mechanical properties. Chemical inoculations are often used to control the size of alpha-Al grains and the morphology of the eutectic Si particles. The grain refiner Al-Ti-B master alloy and eutectic Si modifier Sr are commonly used in industry. In recent years, great attention has been paid to controlling the microstructure and mechanical properties of hypoeutectic Al-Si alloys through the use of the cost-effective rare earth element La. Previous studies have mainly focused on the effects of La addition on the microstructural evolution and improvements of the mechanical properties. However, to date there have been no studies on the effects of combined addition of La, Al-Ti-B master alloy and Sr on the microstructure and mechanical properties of Al-Si alloys. In this work, solidification experiments were performed to investigate the effects of the micro-alloying element La, Al-Ti-B master alloy, and Sr on the solidification microstructure and mechanical properties of hypoeutectic Al-Si alloys. These results show that synergistic effects are achieved by combinations of La, Al-Ti-B master alloy, and Sr. An addition of 0.06%La was sufficient for effective alpha-Al grain refinement, eutectic Si particle modification, and improved the ductility of the alloys. Excess La addition formed a coarse LaAlSi intermetallic compound, which deteriorated the ductility of the alloy. The micro-alloying element La refined the alpha-Al grains by acting as a surfactant that decreased the wetting angle between the TiB2 nucleation substrate and the alpha-Al nucleus. It modified the eutectic Si particles by promoting the formation of the multiple Si twins and changing the growth behaviors of the Si particles.
KeywordAl-Si alloy micro-alloying element La solidification microstructure mechanical property
Funding OrganizationNational Natural Science Foundation of China ; Science and Technology Project of the Headquarters of Sate Grid Company of China
DOI10.11900/0412.1961.2020.00158
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51771210] ; National Natural Science Foundation of China[51971227] ; Science and Technology Project of the Headquarters of Sate Grid Company of China
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000624917400009
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/161281
Collection中国科学院金属研究所
Corresponding AuthorZhao Jiuzhou
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
3.State Grid Henan Elect Power Co, Elect Power Res Inst, Zhengzhou 450052, Peoples R China
Recommended Citation
GB/T 7714
Zheng Qiuju,Ye Zhongfei,Jiang Hongxiang,et al. Effect of Micro-Alloying Element La on Solidification Microstructure and Mechanical Properties of Hypoeutectic Al-Si Alloys[J]. ACTA METALLURGICA SINICA,2021,57(1):103-110.
APA Zheng Qiuju,Ye Zhongfei,Jiang Hongxiang,Lu Ming,Zhang Lili,&Zhao Jiuzhou.(2021).Effect of Micro-Alloying Element La on Solidification Microstructure and Mechanical Properties of Hypoeutectic Al-Si Alloys.ACTA METALLURGICA SINICA,57(1),103-110.
MLA Zheng Qiuju,et al."Effect of Micro-Alloying Element La on Solidification Microstructure and Mechanical Properties of Hypoeutectic Al-Si Alloys".ACTA METALLURGICA SINICA 57.1(2021):103-110.
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