MODELLING AND SIMULATION OF THE MICROSTRUCTURE FORMATION IN A STRIP CAST Al-Pb ALLOY

doi:10.3724/SP.J.1037.2009.00782

IMR OpenIR

	MODELLING AND SIMULATION OF THE MICROSTRUCTURE FORMATION IN A STRIP CAST Al-Pb ALLOY
	Li Haili 2; Zhao Jiuzhou 1
通讯作者	Zhao Jiuzhou(jzzhao@imr.ac.cn)
	2010-06-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	46 期号:6 页码:695-700
摘要	When a single-phase liquid is cooled into the miscibility gap, it decomposes into two liquid phases. Generally the liquid-liquid phase transformation causes the formation of a solidification microstructure with serious phase segregation. Many efforts have been made to use the liquid-liquid demixing phenomenon for the production of the finely dispersed metal-metal composite materials. It is demonstrated that the only effective method of preventing the formation of the microstructure with heavy phase segregation in monotectic alloys is using the rapid solidification processing techniques. Strip casting may have great potentials in the manufacturing of the bulk materials of this kind of alloys. In this paper, a model was developed to describe the microstructure formation in a strip cast monotectic alloy based on the population dynamic method. The model takes into account the concurrent actions of the nucleation, diffusional growth and motions of the minority phase droplets. The model was numerically solved together with the controlling equations for the heat transfer, mass transport and momentum transfer to study the microstructure development in the strip cast Al-Pb alloys. The effects of alloy composition, solidification velocity and melting temperature on the microstructure formation were investigated. The results indicate that with the increase of the solidification velocity, the nucleation position of the minority phase droplets moves towards the solidification interface, the nucleation rate and number density of droplets increase and the average droplet size decreases. All these are favorable for the formation of a well dispersed microstructure. With the increase of the Pb content, the nucleation position of the minority phase droplets moves away form the solidification interface, the nucleation rate decreases, and the average droplet size increases. These are against the formation of a well dispersed microstructure. With the increase of the melting temperature, the nucleation rate and number density of droplets increase and the average droplet size decreases. These are favorable for the formation of a well dispersed microstructure. But the velocity of the minority phase droplets decreases with the increase of the melting temperature. When the velocity of droplets is negative, samples can not obtain steady state solidification and result in the formation of a microstructure with massive segregation.
关键词	monotectic alloy liquid-liquid transformation solidification modeling and simulation
资助者	National Natural Science Foundation of China
DOI	10.3724/SP.J.1037.2009.00782
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[50771097] ; National Natural Science Foundation of China[u0837601]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000280030800008
出版者	SCIENCE CHINA PRESS
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/99780
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, Shenyang 110016, Peoples R China 2.Shenyang Ligong Univ, Weaponry Sci Technol Res Ctr, Shenyang 110159, Peoples R China
推荐引用方式 GB/T 7714	Li Haili,Zhao Jiuzhou. MODELLING AND SIMULATION OF THE MICROSTRUCTURE FORMATION IN A STRIP CAST Al-Pb ALLOY[J]. ACTA METALLURGICA SINICA,2010,46(6):695-700.
APA	Li Haili,&Zhao Jiuzhou.(2010).MODELLING AND SIMULATION OF THE MICROSTRUCTURE FORMATION IN A STRIP CAST Al-Pb ALLOY.ACTA METALLURGICA SINICA,46(6),695-700.
MLA	Li Haili,et al."MODELLING AND SIMULATION OF THE MICROSTRUCTURE FORMATION IN A STRIP CAST Al-Pb ALLOY".ACTA METALLURGICA SINICA 46.6(2010):695-700.