Effect mechanisms of micro-alloying element La on microstructure and mechanical properties of hypoeutectic Al-Si alloys

doi:10.1016/j.jmst.2019.12.021

CORC > 金属研究所 > 中国科学院金属研究所

	Effect mechanisms of micro-alloying element La on microstructure and mechanical properties of hypoeutectic Al-Si alloys
	Zheng, Qiuju 1,2; Zhang, Lili 1; Jiang, Hongxiang 1; Zhao, Jiuzhou 1,2; He, Jie 1,2
刊名	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2020-06-15
卷号	47 页码:142-151
关键词	Aluminum alloy Micro-alloying element La Microstructure Tensile properties Mechanisms
ISSN号	1005-0302
DOI	10.1016/j.jmst.2019.12.021
通讯作者	Zhao, Jiuzhou(jzzhao@imr.ac.cn)
英文摘要	The rare earth influence on the as-cast microstructures and mechanical properties of aluminum alloys attracted great attentions in the last decades. But up to date no reports can be found on the effect of micro-alloying element La (La addition is below 0.1 wt.%) on the solidification of hypoeutectic Al-Si alloys. This study carried out solidification experiments with Al-6Si alloys micro-alloyed by element La. The alpha-Al grain refinement, the eutectic Si modification and the tensile properties improvement caused by micro-alloying element La were investigated. The effect mechanisms of La were discussed. It is demonstrated that the addition of La as low as 100 ppm can deprave the more effective heterogeneous nucleation conditions for the eutectic Si caused by the impurity P. The addition of 0.06 wt.% La is sufficient to achieve an ideal alpha-Al grain refinement, eutectic Si modification and ductility improvement of the alloys. LaAlSi phase forms in the Al-Si alloy with the additive amount of La higher than 0.06 wt.%. It has a tetragonal structure. Micro-alloying element La refines the alpha-Al grains by working as a surfactant and modifies the eutectic Si by promoting the formation of the significant multiple Si twins. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
资助项目	National Natural Science Foundation of China[51771210] ; National Natural Science Foundation of China[51901231] ; Scienceand technology project of the headquarters of SGCC ; Chinese Academy of Sciences StrategicPriority Program on Space Science[XDA15013800] ; China's Manned Space Station Project[TGJZ800-2-RW024]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	JOURNAL MATER SCI TECHNOL
WOS记录号	WOS:000526956900015
资助机构	National Natural Science Foundation of China ; Scienceand technology project of the headquarters of SGCC ; Chinese Academy of Sciences StrategicPriority Program on Space Science ; China's Manned Space Station Project
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/138559]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhao, Jiuzhou
作者单位	1.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
推荐引用方式 GB/T 7714	Zheng, Qiuju,Zhang, Lili,Jiang, Hongxiang,et al. Effect mechanisms of micro-alloying element La on microstructure and mechanical properties of hypoeutectic Al-Si alloys[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2020,47:142-151.
APA	Zheng, Qiuju,Zhang, Lili,Jiang, Hongxiang,Zhao, Jiuzhou,&He, Jie.(2020).Effect mechanisms of micro-alloying element La on microstructure and mechanical properties of hypoeutectic Al-Si alloys.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,47,142-151.
MLA	Zheng, Qiuju,et al."Effect mechanisms of micro-alloying element La on microstructure and mechanical properties of hypoeutectic Al-Si alloys".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 47(2020):142-151.