A New Understanding Toward Effect of Solute Ti on Grain Refinement of Aluminum by Al-Ti-B Master Alloy: Kinetic Behaviors of TiB2 Particles and Effect of Solute Ti

doi:10.11900/0412.1961.2017.00084

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	A New Understanding Toward Effect of Solute Ti on Grain Refinement of Aluminum by Al-Ti-B Master Alloy: Kinetic Behaviors of TiB2 Particles and Effect of Solute Ti
	Zhang Lili 1; Jiang Hongxiang 1; Zhao Jiuzhou 1; Li Lu 2; Sun Qian 1
刊名	ACTA METALLURGICA SINICA
	2017-09-11
卷号	53 期号:9 页码:1091-1100
关键词	grain refinement Al-Ti-B master alloy TiB2 kinetic behavior simulation
ISSN号	0412-1961
DOI	10.11900/0412.1961.2017.00084
通讯作者	Zhao Jiuzhou(jzzhao@imr.ac.cn)
英文摘要	Grain refinement may not only promote the formation of a fine quiaxed grain structure, which endows the Al alloy castings with good mechanical properties, but also cause a reduction in the casting defects, such as segregation and hot tearing, which has a dominating effect on the processability of Al alloys. It is, thus, essential for both the cast and wrought Al alloys. Although many techniques, e.g. mechanical vibration, electromagnetic stirring, ultrasound vibration, etc. may be used for the grain refinement nowadays, inoculation remains the most widely applied method in the industrial production due to its simplicity and high efficiency. For most Al alloys, Al-Ti-B master alloy is used as the grain refiner. Much work has been done to investigate the solidification behaviors of the Al alloys inoculated with Al-Ti-B master alloys since the 1970 s. Models were developed to describe the microstructure formation underthe effect of inoculants. These researches clearly demonstrate that the grain refining efficiency or the heterogeneous nucleation rate is closely related to the concentration of solute Ti as well as the number density and size distribution of TiB2 particles in the melt. One shortcoming of the previous research work in this field is that the kinetic behaviors of TiB2 particles during the heating or cooling processes of the melt, i.e. dissolution/growth, coarsening and precipitation of TiB2 particles, are neglected. Generally the size distribution of TiB2 particles in the Al-Ti-B master alloy was used in the modeling and simulation of the solidification of Al alloys. In this work, solidification experiments were carried out to investigate the kinetic behaviors of TiB2 particles in the melt and the effect of solute Ti. A model was developed to describe the kinetic behaviors of TiB2 particles during the whole process from the beginning of the addition of TiB2 particles to the melt until the solidification of the melt. Calculations were carried out according to the experiments conditions. The results demonstrate that TiB2 particles may dissolve and coarsen during the holding temperature period, and grow during the cooling period of the melt. The kinetic behaviors of TiB2 particles have an obvious effect on the grain refining efficiency of the master alloys. The addition of solute Ti can significantly suppress the growth/dissolution, the Ostwald ripening of TiB2 particles and thus affects the grain refining efficiency of the master alloy.
资助项目	National Natural Science Foundation of China[51501207] ; National Natural Science Foundation of China[51471173] ; China's Manned Space Station Project[TGJZ800-2-RW024] ; Natural Science Foundation of Liaoning Province[201501043]
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000409253300007
资助机构	National Natural Science Foundation of China ; China's Manned Space Station Project ; Natural Science Foundation of Liaoning Province
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/124948]
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, Liaoning, Peoples R China 2.Patent Off SIPO, Patent Examinat Cooperat Tianjin Ctr, Tianjin 300304, Peoples R China
推荐引用方式 GB/T 7714	Zhang Lili,Jiang Hongxiang,Zhao Jiuzhou,et al. A New Understanding Toward Effect of Solute Ti on Grain Refinement of Aluminum by Al-Ti-B Master Alloy: Kinetic Behaviors of TiB2 Particles and Effect of Solute Ti[J]. ACTA METALLURGICA SINICA,2017,53(9):1091-1100.
APA	Zhang Lili,Jiang Hongxiang,Zhao Jiuzhou,Li Lu,&Sun Qian.(2017).A New Understanding Toward Effect of Solute Ti on Grain Refinement of Aluminum by Al-Ti-B Master Alloy: Kinetic Behaviors of TiB2 Particles and Effect of Solute Ti.ACTA METALLURGICA SINICA,53(9),1091-1100.
MLA	Zhang Lili,et al."A New Understanding Toward Effect of Solute Ti on Grain Refinement of Aluminum by Al-Ti-B Master Alloy: Kinetic Behaviors of TiB2 Particles and Effect of Solute Ti".ACTA METALLURGICA SINICA 53.9(2017):1091-1100.