(鄭州大學(xué) 物理工程學(xué)院 材料物理教育部重點(diǎn)實(shí)驗(yàn)室，鄭州 450052)
摘 要:
關(guān)鍵字: Al-B中間合金；晶粒細(xì)化；共晶反應(yīng)
（Key Laboratory of Material Physics, Ministry of Education, College of Physical Science and Engineering,Zhengzhou University, Zhengzhou 450052, China）
Abstract:Through investigating the grain refinement effect of Al-B master alloy on pure Al, Al-0.5%Si, Al-1%Si, Al-1.5%Mg and Al-4%Cu alloys, the grain refinement mechanism of boron on aluminum alloys was discussed. The experimental results show that Al-B master alloy has very poor grain refinement effect on pure Al, and exhibits a weak grain refinement effect only if B content is above 0.04%. For Al-0.5%Si, Al-1%Si, Al-1.5%Mg and Al-4%Cu alloys, when B content is about 0.02% the grain sizes of the alloys decrease significantly. And with the increase of B content, the grain sizes decrease continuously, but the decreasing rate is smaller. By analyzing the experimental results, it is believed that AlB2 phase can not act as the heterogeneous nucleation site of aluminum alloy melt, and the eutectic reaction mechanism is the main reason of Al-B master alloy grain-refining aluminum alloys.
Key words: Al-B master alloy; grain refinement; eutectic reaction
