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首页> 中文期刊> 《中国有色金属学报（英文版）》 >Al-Si-Cu-Fe合金中富铁金属间化合物的形成和析出

Al-Si-Cu-Fe合金中富铁金属间化合物的形成和析出

         
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摘要

Formation and sedimentation of Fe-rich intermetallics were studied in a commercial Al-Si-Cu-Fe alloy with extra additions of Mn. It is found that the introduction of extra Mn is an effective approach to lower the Fe level in the equilibrium liquid phase after sedimentation of solid Fe-rich phase at a temperature between its liquidus and solidus. The higher Mn/Fe mass ratio results in the lower Fe content in the retained alloy, during which Mn is also consumed and settled at the bottom of the melt as solid Fe-rich intermetallics. Therefore, the final Fe content in the alloy can be controlled by the Mn content and the holding temperature of the melt. The results confirmed a good agreement of the theoretical calculation and the experimental test with a specially designed 50 mm cylindrical casting. The sedimentation of Fe-rich intermetallics in the Al-Si-Cu-Fe alloy is completed at 600 °C after 10 min. The reduction of Fe content in the retained alloy is 31.4% whenm(Mn)/m(Fe)=0.5 and 53.3% whenm(Mn)/m(Fe)=1.0 in comparison with that in the original alloy. The settled Fe-rich intermetallics were identified asα-Al15(Fe,Mn)3Si2, which provided the lower balanced Fe concentration in the melt in comparison with other Fe-rich intermetallics.%研究锰添加对工业用Al-Si-Cu-Fe合金中富铁金属间化合物形成和析出的影响.发现在液固相温度之间经过固态富铁相的析出后,锰的加入是一种有效降低平衡液相中铁含量的方法.高的 m(Mn)/m(Fe)质量比会降低实验合金中的铁含量,在此过程中锰被消耗,并且作为固态富铁金属间化合物沉积在熔体金属的底部.因此,合金中的最终Fe含量可以用锰含量和保温温度来控制.这些结果验证了专门设计的50 mm圆柱铸件的理论计算和实验测试的一致性.在600 °C时,Al-Si-Cu-Fe合金中的富铁金属间化合物10 min后全部析出.与原始合金相比,当 m(Mn)/m(Fe)质量比为 0.5 和 1.0 时,基体中的铁含量分别降低 31.4%和 53.5%.富铁金属间化合物为α-Al15(Fe,Mn)3Si2, 与其他富铁金属间化合物相比,这种相可以提供较低的平衡铁浓度.

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  • 来源
    《中国有色金属学报（英文版）》 |2015年第005期|1704-1714|共11页
  • 作者

    杨文超; 高峰; 冀守勋;

  • 作者单位

    西北工业大学凝固技术国家重点实验室,西安 710072;

    Brunel Centre for Advanced Solidification Technology, Brunel University London, Uxbridge, Middlesex UB8 3PH, United Kingdom;

    Brunel Centre for Advanced Solidification Technology, Brunel University London, Uxbridge, Middlesex UB8 3PH, United Kingdom;

    Brunel Centre for Advanced Solidification Technology, Brunel University London, Uxbridge, Middlesex UB8 3PH, United Kingdom;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类
  • 关键词

    铝合金; 凝固; 金属间化合物; 除铁;

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