Al-Ti-B晶粒细化剂研究进展:细化机理及第二相控制

doi:10.11896/cldb.18120054

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Abstract With the widespread usage of aluminum alloys, the demand for high-quality Al-Ti-B grain refiner is increasing. Fluoride salt method is the mainstream preparation method of Al-Ti-B grain refiners at home and abroad. Domestic researchers have made many efforts to improve the fluoride salt reaction preparation technology of Al-Ti-B grain refiner and obtained some research achievements. However, a breakthrough in preparing the high quality Al-Ti-B grain refiner has not been achieved.
The main refining theories of Al-Ti-B grain refiner are the boron particle theory, the peritectic reaction theory and the duplex nucleation theory and so on. Among them, the duplex nucleation theory can explain the grain refining process of Al-Ti-B grain refiner well. The duplex nucleation theory indicates that if the size of the second phase TiAl₃ and TiB₂ is smaller, the number of the second phase TiAl₃ and TiB₂ is higher, the second phase TiAl₃ and TiB₂ is more evenly distributed, the refining performance of Al-Ti-B grain refiner is better.
The thermodynamics analysis of fluoride salt reaction shows that the generation trend of TiB₂ is the largest, followed by TiAl₃ and AlB₂ is the smallest. During 750—800 ℃, shortening the reaction time properly can guarantee the forming of the TiAl₃ and avoid the forming of the AlB₂ at the same time. The dynamics analysis of fluoride salt reaction shows that the forming of the TiAl₃ and TiB₂ composed of three steps, the decomposition of fluoride salt, the nucleation of the second phase, and the growth of the second phase. By decreasing the size of the fluoride salt, increa-sing the contact area between the decomposition gases (TiF₄ and BF₃) and the aluminum melt, decreasing the absolute saturation of titanium and boron, and shortening the reaction time can gain tiny and dispersive second phase.
This paper mainly introduces the development history and the mainstream preparation methods of Al-Ti-B grain refiner, describes the gap and the existing problems between domestic and imported Al-Ti-B grain refiners. Based on the grain refinement mechanism of Al-Ti-B grain refiner, the thermodynamics and kinetics of fluoride reaction process, the control principle of refinement and dispersion of TiAl₃ and TiB₂ is discussed, the relevant control technology and potential technology are reviewed and prospected respectively.

Key words： Al-Ti-B grain refiner refinement mechanism thermodynamics and kinetics second phase control

Published: 27 April 2020

CLC number:

TG146.2

Fund:This work was financially supported by the National Natural Science Foundation of China (51861020,51741103,51164019), the Key Research and Development Project of Yunnan Province, China (2018BA072).

About author:: Jingming Yan received his B.E. degree in Fuzhou University in 2018. He is currently pursuing his master’s degree at the Kunming University of Science and Technology under the supervision of Prof. Xiaoqing Zuo. His research has focused on Al-Ti-B grain refiner.
Xiaoqing Zuo, Kunming University of Science and Technology, professor, Ph.D., doctoral tutor, chief professor of foam metal materials innovation team of KMUST. His research interests are porous metal mate-rials and metal matrix composite materials. He published 112 papers, including more than 40 articles in SCI and EI, authorized more than 30 national invention patents.

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	YAN Jingming
	LI Ping
	ZUO Xiaoqing
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Cite this article:

YAN Jingming,LI Ping,ZUO Xiaoqing, et al. Research Progress of Al-Ti-B Grain Refiner: Mechanism Analysis and Second Phases Controlling[J]. Materials Reports, 2020, 34(9): 9152-9157.

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http://www.mater-rep.com/EN/10.11896/cldb.18120054 OR http://www.mater-rep.com/EN/Y2020/V34/I9/9152

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