Effect of Mischmetal（MM） and Al5TiB on the Microstructure of B319 Aluminum Alloy in LFC

Wu Guohua  Zhu Yanping  Ding Wenjiang

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Effect of Mischmetal（MM） and Al5TiB on the Microstructure of B319 Aluminum Alloy in LFC
Issue 2, Pages: 1-3(2002)
Published： 2002 ，
DOI：

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[1]吴国华,,,,,,,,,,朱燕萍,,,,,,,,,,丁文江.RE和Al5TiB对消失模铸造B319铝合金组织的影响[J].特种铸造及有色合金,2002(02):1-3+3.

Wu Guohua Zhu Yanping Ding Wenjiang. Effect of Mischmetal（MM） and Al5TiB on the Microstructure of B319 Aluminum Alloy in LFC. [J]. Special Casting & Nonferrous Alloys (2):1-3(2002)
[1]吴国华,,,,,,,,,,朱燕萍,,,,,,,,,,丁文江.RE和Al5TiB对消失模铸造B319铝合金组织的影响[J].特种铸造及有色合金,2002(02):1-3+3. DOI：

Wu Guohua Zhu Yanping Ding Wenjiang. Effect of Mischmetal（MM） and Al5TiB on the Microstructure of B319 Aluminum Alloy in LFC. [J]. Special Casting & Nonferrous Alloys (2):1-3(2002) DOI：

摘要

利用等离子发射光谱仪、能谱仪、X射线衍射以及金相分析等手段

研究了RE和Al5TiB对消失模铸造B3 19铝合金组织的影响。研究表明

在消失模铸造条件下

RE的质量分数为 0 .2 %时可使B3 19铝合金的硅相得到较好的变质

组织中存在珊瑚状的Al2 Cu相和文字状的α Fe相及针状的 β Fe相

且Si相和针状 β Fe相可以作为Al2 Cu的形核基底。但当w（RE） =0 .3 %时

会出现富稀土的金属间化合物La3 Al8Si2 。RE还会与Ti发生相互作用形成块状稀土化合物

而对组织产生不利影响。研究结果表明

在采用RE变质的情况下

不宜用Al5TiB中间合金作为细化剂。

Abstract

Influence of MM and Al5TiB on the microstructure of B319 aluminum alloy in lost foam casting（LFC） was investigated by means of ICP spectroscopy

energy dispersive x ray analysis （EDX）

X ray diffraction and microscope analysis. The results showed that Si phase in B319 aluminum alloy could be modified well with 0.2% RE in lost foam casting and coral like Al 2Cu phase

Chinese character α Fe phase and acicular β Fe phase were found also in the structure

of which both Si phase and acicular β Fe can be acted as the substrate for Al 2Cu phase nucleation.Intermetallic compound rich in La La 2Si 2Al 3 would appear with over 0.3% MM addition. MM may react with Ti to form blocky compound containing RE to deteriorate the structures of the alloy. The results showed that Al5TiB master alloy is unsuitable refiner with mischmetal modification.