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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。
The effects of RE and Al5TiB on the lossless cast B3 19 aluminum alloy were studied by means of plasma emission spectrometer, energy dispersive spectrometer, X-ray diffraction and metallographic analysis. The results show that under the condition of EPC, the silicon phase of B3 19 aluminum alloy can be well metamorphosed when the mass fraction of RE is 0.2%, and the coral Al2 Cu phase and the textual α Fe Phase and needle-shaped β Fe phase, and Si phase and acicular β Fe phase can be used as the nucleation base of Al2 Cu. However, when w (RE) = 0.3%, the rare earth-rich intermetallic compound La3Al8Si2 appears. RE also interacts with Ti to form bulk rare earth compounds that adversely affect the tissues. The results show that, in the case of the use of RE metamorphism, Al5TiB master alloy should not be used as a refiner.