Liquid-Solid Phase Separation Process of Pb-Al Alloy Under the Effect of Electric Current Pulses

doi:10.11900/0412.1961.2022.00505

IMR OpenIR

	Liquid-Solid Phase Separation Process of Pb-Al Alloy Under the Effect of Electric Current Pulses
	Li, Yanqiang 1,2; Zhao, Jiuzhou 1,2; Jiang, Hongxiang 1,2; Zhang, Lili 1; He, Jie 1,2
通讯作者	Zhao, Jiuzhou(jzzhao@imr.ac.cn)
	2024-12-01
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	60 期号:12 页码:160
摘要	The Pb-Al alloy, which undergoes liquid-solid (L-S) phase separation, can potentially serve as a high-performance and low-cost anode material for hydrometallurgy and a grid material for lead-acid batteries. For this purpose, a microstructure containing uniformly dispersed micro/nano Al-rich particles in the Pb matrix is desired. However, during cooling of the Pb-Al alloy melt, Al-rich particles nucleate from the matrix melt first, grow, and migrate in the melt until they are caught by the solidification interface. Consequently, Pb-Al alloys often exhibit a solidification microstructure with coarse Al-rich particles or significant phase segregation. Recent studies have shown that the application of electric current pulses (ECPs) during solidification can effectively modify the microstructure evolution. This research aims to investigate the possibility of controlling the L-S phase separation process and microstructure of Pb-Al alloys. To achieve this, continuous solidification experiments were carried out on Pb-Al L-S phase separation alloy while subject to ECPs. A theoretical model describing the microstructure formation during the L-S phase separation process of the alloy under the effect of ECPs was proposed. The microstructure evolution was simulated according to the experimental conditions, and the effect of ECPs on the L-S phase separation process of the alloy was analyzed. It was demonstrated that ECPs can effectively reduce the energy barrier for the nucleation of Al-rich particles during the L-S phase separation process of Pb-Al alloy, enhance the particles' nucleation rate, and reduce the average radius, thereby promoting the formation of a composite containing in situ micro/nano Al-rich particles embedded in the Pb matrix. The peak current density (j(max)) has two critical values (j(c1) and j(c2)). When j(max) <= j(c1), ECPs have a negligible effect on the nucleation behavior of Al-rich particles. When j(c1) < j(max) < j(c2), the nucleation rate and number density of the Al-rich particles increase rapidly with increasing j(max). When j(max) >= j(c2), the nucleation rate and number density increase continuously with increasing j(max), but at a lower rate. Furthermore, the electromagnetic force causes migration of the Al-rich particles toward the center of the sample, resulting in the emergence of an Al-poor layer on the surface of the sample and promoting the formation of a special composite composed of a Pb-rich shell and an in situ Al-rich particles reinforced Pb matrix core.
关键词	electric current pulse immiscible alloy liquid-solid phase separation nucleation simulation
DOI	10.11900/0412.1961.2022.00505
收录类别	SCI
语种	英语
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001381258500012
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/321006/181217
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, Shi Changxu Innovat Ctr Adv Mat, 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	Li, Yanqiang,Zhao, Jiuzhou,Jiang, Hongxiang,et al. Liquid-Solid Phase Separation Process of Pb-Al Alloy Under the Effect of Electric Current Pulses[J]. ACTA METALLURGICA SINICA,2024,60(12):160.
APA	Li, Yanqiang,Zhao, Jiuzhou,Jiang, Hongxiang,Zhang, Lili,&He, Jie.(2024).Liquid-Solid Phase Separation Process of Pb-Al Alloy Under the Effect of Electric Current Pulses.ACTA METALLURGICA SINICA,60(12),160.
MLA	Li, Yanqiang,et al."Liquid-Solid Phase Separation Process of Pb-Al Alloy Under the Effect of Electric Current Pulses".ACTA METALLURGICA SINICA 60.12(2024):160.