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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    Special 2    September 2009

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Optimization of processing parameters for preparation of
Al-3Ti-1B grain refiner
LI Bao(李 豹)1, WANG Hong-wei(王宏伟)1, ZHAO Rui-feng(赵瑞峰)2, WEI Zun-jie(魏尊杰)1

1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
2. Beijng Xinghang Mechanical Electrical Equipment Factory, Beijing 100074, China

Abstract:Al-3Ti-1B master alloys were prepared at different processing parameters by the reaction of halide salts, and the grain refining response of Al-7Si alloy was investigated with Al-3Ti-B master alloy. The microstructure of master alloy and its grain refining effect on Al-7Si alloy were investigated by means of OM, XRD and SEM. Experimental results show that, the size of Al3Ti particles presented in Al-3Ti-1B master alloys increases with the increase of reaction temperature and decreases with the increase of cooling rate. The grain refining efficiency of Al-3Ti-1B master alloy on Al-7Si alloy is mainly attributed to heterogeneous nucleation of Al3Ti particles, and the morphology of α(Al) changes from coarse dendritic to fine equiaxed. As a result, Al-3Ti-1B master alloy is prepared by permanent mold, and holding at 800 ℃ for 30 min, which has better grain refining performance on Al-7Si alloy.

 

Key words: Al-3Ti-1B master alloy; processing parameters; grain refinement; Al-7Si alloy

ISSN 1672-7029
CN 43-1423/U

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