Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第18卷    第6期    总第111期    2008年6月

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文章编号:1004-0609(2008)06-0974-06
Al-B中间合金对铝合金晶粒的细化机理
王 芳,王明星,李云良,刘志勇,刘忠侠,宋天福

(郑州大学 物理工程学院 材料物理教育部重点实验室,郑州 450052)

摘 要:

通过对Al-B中间合金在纯铝、Al-0.5%Si、Al-1%Si、 Al-1.5%Mg以及Al-4%Cu合金中的晶粒细化作用的实验研究,分析B的晶粒细化机理。结果表明:Al-B中间合金对纯铝的细化作用很弱,仅当B含量高于0.04%时,才表现出一定的细化效果。对于Al-0.5%Si、Al-1%Si、 Al-1.5%Mg和Al-4%Cu合金,加入少量的B,对合金几乎没有细化作用;但当B含量达到0.02%时,合金晶粒明显细化,晶粒尺寸显著下降;增加B含量,晶粒尺寸继续下降,但下降速度趋缓。这表明AlB2不能作为液态铝的形核中心,而共晶反应机制是Al-B中间合金具有晶粒细化作用的主要原因。

 

关键词: Al-B中间合金;晶粒细化;共晶反应

Grain refining mechanism of Al-B master alloy on Al alloys
WANG Fang, WANG Ming-xing, LI Yun-liang, LIU zhi-yong, LIU Zhong-xia, SONG Tian-fu

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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