Analysis of Macrosegregation in Directional Solidified Al-40Cu Alloy Caused by Mixing Flow in Liquid Melt

Tang Ling

doi:10.15980/j.tzzz.2015.07.002

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Analysis of Macrosegregation in Directional Solidified Al-40Cu Alloy Caused by Mixing Flow in Liquid Melt
Vol. 35, Issue 7, Pages: 676-679(2015)
Published： 2015 ，
DOI： 10.15980/j.tzzz.2015.07.002

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[1]唐玲.Al-40Cu合金定向凝固铸锭的宏观偏析研究[J].特种铸造及有色合金,2015,35(07):676-679.

Tang Ling. Analysis of Macrosegregation in Directional Solidified Al-40Cu Alloy Caused by Mixing Flow in Liquid Melt. [J]. Special Casting & Nonferrous Alloys 35(7):676-679(2015)
[1]唐玲.Al-40Cu合金定向凝固铸锭的宏观偏析研究[J].特种铸造及有色合金,2015,35(07):676-679. DOI： 10.15980/j.tzzz.2015.07.002.

Tang Ling. Analysis of Macrosegregation in Directional Solidified Al-40Cu Alloy Caused by Mixing Flow in Liquid Melt. [J]. Special Casting & Nonferrous Alloys 35(7):676-679(2015) DOI： 10.15980/j.tzzz.2015.07.002.

摘要

通过Al-40Cu过共晶合金在10μm/s的凝固速率下定向凝固

得到了4mm×120mm铸锭。采用光学显微镜、成分分析等手段研究了定向凝固铸锭不同部位的凝固组织、宏观偏析等。结果表明

Al-40Cu合金在10μm/s的定向凝固速率下

铸锭沿生长方向存在凝固组织从有大量初生Al2Cu相到初生Al2Cu相消失转变。这是因为合金中液相的流动造成了Cu元素轴向宏观偏析

利用Scheil方程和BH模型进行了理论计算

试验结果与理论值基本一致。

Abstract

The directional solidification experiment was carried out for hypereutectic Al-40 Cu alloy to prepare4mm×120mm cylinder-shaped ingot at 10μm/s.The solidification structure and macrosegregation at different positions of the ingot were observed by optical microscope and component analysis.The results show that the microstructures in the ingot is changed from a great quantity of Al2 Cu primary phases to absence of Al2 Cu primary phases at different position along growth direction.The macrosegregation of Cu element is attributed to mixing flow in liquid melt.Using the Scheil equation and BH model

the solute segregation in the solidified sample was calculated

which was well agreement with experimental ones.