Key Factors Influencing Eutectic Si Modification in Al-Si Hypoeutectic Alloy by Trace La

doi:10.11900/0412.1961.2021.00490

IMR OpenIR

	Key Factors Influencing Eutectic Si Modification in Al-Si Hypoeutectic Alloy by Trace La
	Zhang Lili 1; Ji Zongwei 2; Zhao Jiuzhou 1; He Jie 1; Jiang Hongxiang 1
通讯作者	Zhao Jiuzhou(jzzhao@imr.ac.cn)
	2023-11-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	59 期号:11 页码:1541-1546
摘要	The modification of eutectic Si to fiber morphology from coarse plate-like morphology is essential for producing an Al-Si hypoeutectic alloy. Furthermore, chemical modification through the addition of modifying elements, such as Na and Sr, to melt is the most widely used method in industrial production to improve microstructures. Recently, the effect of rare earth metals on the eutectic Si modification has also attracted considerable attention, especially for the economical element La. Key factors influencing eutectic Si modification in Al-Si hypoeutectic alloy by trace La are theoretically explored. The results demonstrate that the solubility of La in the primary alpha-Al phase and interaction parameter between La and Al (or Si) primarily contribute to the eutectic Si modification. When the addition level of trace La is within its solubility in the primary alpha-Al phase, La distributes in alpha-Al and eutectic Si, and the modification effect increases with the La addition level. When the addition level of trace La is greater than its solubility in alpha-Al, a ternary compound containing Al, Si, and La exists before the eutectic reaction due to the significant value of the interaction parameter between La and Al (or Si). Calculated results further prove that the composition of the ternary compound is AlSiLa due to the substantial value of heat for the formation of AlSiLa and the small value of interfacial energy between Al melt and AlSiLa. Under this condition, La distributes in alpha-Al, AlSiLa, and eutectic Si, and the La content in alpha-Al and eutectic Si almost remain constant. Thus, the modification effect almost stays unchanged with La addition. A suitable modification effect is achieved when the La addition level is around its solubility in the primary alpha-Al phase.
关键词	Al-Si hypoeutectic alloy modification interaction parameter trace element La solubility
资助者	National Key Research and Development Program of China ; China's Manned Space Station Project ; National Natural Science Foundation of China
DOI	10.11900/0412.1961.2021.00490
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program of China[2021YFA0716303] ; China's Manned Space Station Project ; National Natural Science Foundation of China[51901231] ; National Natural Science Foundation of China[51971227]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001087007400013
出版者	SCIENCE PRESS
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/177986
专题	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, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China 2.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
推荐引用方式 GB/T 7714	Zhang Lili,Ji Zongwei,Zhao Jiuzhou,et al. Key Factors Influencing Eutectic Si Modification in Al-Si Hypoeutectic Alloy by Trace La[J]. ACTA METALLURGICA SINICA,2023,59(11):1541-1546.
APA	Zhang Lili,Ji Zongwei,Zhao Jiuzhou,He Jie,&Jiang Hongxiang.(2023).Key Factors Influencing Eutectic Si Modification in Al-Si Hypoeutectic Alloy by Trace La.ACTA METALLURGICA SINICA,59(11),1541-1546.
MLA	Zhang Lili,et al."Key Factors Influencing Eutectic Si Modification in Al-Si Hypoeutectic Alloy by Trace La".ACTA METALLURGICA SINICA 59.11(2023):1541-1546.