Mechanism of boron removal of primary Si phases and morphology evolution of impurity phases during slow cooling solidification refining of Al-30wt.%Si alloy with Zr additions

doi:10.1016/j.jallcom.2020.158517

	Mechanism of boron removal of primary Si phases and morphology evolution of impurity phases during slow cooling solidification refining of Al-30wt.%Si alloy with Zr additions
	Chen, Chen 2,3; Ban, Boyuan 2; Sun, Jifei 2,3; Li, Jingwei 2; Jiang, Xuesong 2,3; Shi, Jian 2,3; Chen, Jian 2; Jia, Jianbo 4; Sakiani, Hassan 1; Tabaian, Seyed Hadi 1
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2021-04-15
卷号	860
关键词	B removal ZrB2 and ZrSi2 phases Trapping and engulfing Kinetics
ISSN号	0925-8388
DOI	10.1016/j.jallcom.2020.158517
通讯作者	Ban, Boyuan(banboyuan@rntek.cas.cn) ; Li, Jingwei(jwli@rntek.cas.cn) ; Chen, Jian(jchen@ipp.ac.cn)
英文摘要	This work combines the control of kinetic factors and the addition of a small amount of Zr element in Al-Si solvent refining process to obtain a super high B removal rate. Impurity removal of primary Si phases in Al-30wt.%Si alloy is evaluated by solvent refining with slow cooling rates of 0.4, 2, 10, and 50 mk . s(-1), and Zr addition contents of 0, 330,1000, and 3000 ppmw, respectively. With a 3000 ppmw Zr addition, the removal fraction of B in the primary Si is all over 93% and the best value reaches 99.36%. The P content is more sensitive to the cooling rate but does not change significantly with the increase of Zr. By morphology observation and ICP-OES analysis of the primary Si phases, the interaction between Zr, B, and Si, and the morphology evolution of ZrB2 and ZrSi2 phases are revealed. Based on theoretical calculations, the formation temperature of ZrB2 in the Al-Si melt is evaluated and a competitive reaction mechanism is discovered. Due to the excessive Zr addition, Zr first reacts with B and forms ZrB2 before the primary Si phase growth, which causes a decrease of the B content in the melt and contributes to the high B removal fraction. The remaining Zr in the melt combines with Si to form ZrSi2 phases. A model is established to describe the different trapping/ engulfing/ pushing situations of ZrB2 and ZrSi2 phases, which determine the final impurity content in the refined primary Si phases. (C) 2020 Elsevier B.V. All rights reserved.
资助项目	National Natural Science Foundation of China[51804294] ; National Natural Science Foundation of China[51874272] ; Anhui Provincial Natural Science Foundation[1808085ME121] ; Key Laboratory of Photovoltaic and Energy Conservation Materials, Chinese Academy of Science[PECL2018QN002] ; Key Laboratory of Photovoltaic and Energy Conservation Materials, Chinese Academy of Science[PECL2019ZD005] ; State Key Laboratory of Pollution Control and Resource Reuse Foundation (Tongji University)[PCRRF18017] ; International Clean Energy Talent Program by China Scholarship Council
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000614154600121
资助机构	National Natural Science Foundation of China ; Anhui Provincial Natural Science Foundation ; Key Laboratory of Photovoltaic and Energy Conservation Materials, Chinese Academy of Science ; State Key Laboratory of Pollution Control and Resource Reuse Foundation (Tongji University) ; International Clean Energy Talent Program by China Scholarship Council
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/119602]
专题	中国科学院合肥物质科学研究院
通讯作者	Ban, Boyuan; Li, Jingwei; Chen, Jian
作者单位	1.Amirkabir Univ Technol, Dept Mat Engn & Met, Tehran Polytech, Tehran 1591634311, Iran 2.Chinese Acad Sci, HFIPS, Inst Solid State Phys, Key Lab Photovolta & Energy Conservat Mat, Hefei 230031, Peoples R China 3.Univ Sci & Technol China, Hefei 230026, Peoples R China 4.Yanshan Univ, Educ Minist Key Lab Adv Forging & Stamping Techno, Qinhuangdao 066004, Peoples R China
推荐引用方式 GB/T 7714	Chen, Chen,Ban, Boyuan,Sun, Jifei,et al. Mechanism of boron removal of primary Si phases and morphology evolution of impurity phases during slow cooling solidification refining of Al-30wt.%Si alloy with Zr additions[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2021,860.
APA	Chen, Chen.,Ban, Boyuan.,Sun, Jifei.,Li, Jingwei.,Jiang, Xuesong.,...&Tabaian, Seyed Hadi.(2021).Mechanism of boron removal of primary Si phases and morphology evolution of impurity phases during slow cooling solidification refining of Al-30wt.%Si alloy with Zr additions.JOURNAL OF ALLOYS AND COMPOUNDS,860.
MLA	Chen, Chen,et al."Mechanism of boron removal of primary Si phases and morphology evolution of impurity phases during slow cooling solidification refining of Al-30wt.%Si alloy with Zr additions".JOURNAL OF ALLOYS AND COMPOUNDS 860(2021).