磁场对Cu-Pb-La过偏晶合金液-液分离的作用

发布时间：2018-03-22 21:40

本文选题：Cu-Pb-La　切入点：过偏晶合金　出处：《稀有金属材料与工程》2015年02期 　论文类型：期刊论文

【摘要】：本实验在Cu-80%Pb过偏晶合金凝固过程中添加稀土元素La,研究不同冷却速度下稀土元素在过偏晶合金凝固制备中的作用,并研究施加磁场对Cu-Pb过偏晶合金液-液分离区凝固组织的影响,探讨了磁场下第二相的迁移和分布规律,为均质偏晶合金制备技术的改进提供参考。结果表明,添加La元素可显著降低Cu-80%Pb凝固组织中的宏观偏析,促进第二相颗粒的均匀分布和细化。较快的冷却速度下添加La元素的作用更加明显,偏析程度显著降低,在此冷速下进一步施加1 T水平方向磁场,Cu-Pb-La合金凝固过程中宏观偏析得到了抑制,富Cu相颗粒弥散,组织分布均匀。
[Abstract]:In this experiment, rare earth elements La were added to Cu-80%Pb hypermonotectic alloy during solidification, and the effect of rare earth elements on the preparation of supermonotectic alloy at different cooling rates was studied. The effect of magnetic field on the solidification structure in the liquid-liquid separation zone of Cu-Pb hypermonotectic alloy was studied. The migration and distribution of the second phase in the magnetic field were discussed, which provided a reference for the improvement of the preparation technology of homogeneous monotectic alloy. The addition of La element can significantly reduce the macro segregation in the solidified microstructure of Cu-80%Pb, promote the uniform distribution and refinement of the second phase particles, and the effect of adding La element is more obvious at the faster cooling rate, and the segregation degree is significantly reduced. The macro segregation of Cu-Pb-La alloy was restrained during the solidification of Cu-Pb-La alloy with 1T horizontal magnetic field at this cooling rate. The Cu-rich particles were dispersed and the microstructure was uniformly distributed.
【作者单位】：东北大学材料电磁过程研究教育部重点实验室;
【基金】：国家自然科学基金(50901019,51474066) 高等学校博士学科点专项科研基金(2012004211008) 中央高校基本科研业务费专项资金(N130409001) 国家高技术研究发展计划项目(2007AA03Z519) 高等学校学科创新引智计划项目(B07015)
【分类号】：TG146.11

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