Al-B中间合金对铝合金晶粒的细化机理
来源期刊:中国有色金属学报2008年第6期
论文作者:王芳 王明星 李云良 刘志勇 刘忠侠 宋天福
文章页码:974 - 974
关键词:Al-B中间合金;晶粒细化;共晶反应;
Key words:Al-B master alloy; grain refinement; eutectic reaction
摘 要:
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.