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grain refining action of Ti existing in electrolytic low-titanium aluminum with Al-4B addition for superheated Al melt

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Transactions of Nonferrous Metals Society of China 2010年第6期20卷 950-957页

作者：王明星庞金辉刘志勇刘忠侠宋天福杨昇 Department of Physics Key Laboratory of Materials Physics of Ministry of Education Zhengzhou University

The effects of superheating temperature on the grain refining efficiency of Ti existing in electrolytic low-titanium aluminum(ELTA)without and with the Al-4B addition and the Al-5Ti-1B master alloy in pure Al were comparatively investigated. The results show that the Ti existing in ELTA without Al-4B addition exhibits a certain grain refining efficiency when the melt superheating temperature is lower,but the efficiency decreases rapidly when the superheating temperature is *** grain refining efficiency of the Al-5Ti-1B master alloy is better than that of the Ti existing in ELTA without Al-4B addition at any superheating temperature,but it also decreases obviously with the increase of the superheating *** important reason is that the TiB2 particles coming from the Al-5Ti-1B master alloy can settle down at the bottom of the Al melt easily when the superheating temperature is increased,thus decrease the number of the potent heterogeneous nuclei retained in the Al *** the Al-4B master alloy is added to the ELTA melt,the grain refining efficiency of the Ti existing in ELTA can be improved significantly, and does not decrease with the increase of the superheating *** perhaps provides us a possible method to suppress the effect of the superheated melt on the microstructures of aluminum..

关键词： electrolytic low-titanium aluminum grain refining efficiency superheating Al-4B Al-5Ti-1B

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Effect of Al_4C_3 Particle Size Distribution in a Al–2.5C Master Alloy on the refining efficiency of the AZ31 Alloy

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Acta Metallurgica Sinica(English Letters) 2017年第6期30卷 505-512页

作者： Yu-Zhen Zhao Xiao-Teng Liu Hai Hao Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China

The Al-2.5C master alloy is prepared to investigate the effect of the Al4C3 particle size distribution on the refining efficiency of the AZ31 alloy. The results indicate that the Al4C3 particles are potent nucleation substrates for primary α-Mg grains. With 1.0 wt% master alloy addition, the grain size is reduced from 204 to 70 μm. The grain refining efficiency of the Al4C3 particles on the AZ31 alloy is calculated to be 0.04%-0.75%. Such low refining efficiency is mainly attributed to the size distribution of the Al4C3 particles. The particle sizes are in the range from 0.18 to 7.08 μm, and their distribution is well fitted by a log-normal function. The optimum particle size range for significant grain refinement is proposed to be around 5.0-7.08 μm in the present conditions.

关键词： Particle size distribution grain refining efficiency Al-2.5C master alloy Magnesium alloys

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