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Microsegregation Formation in Al-Cu Alloy under Action of Steady Magnetic Field

机译：稳定磁场作用下铝铜合金中的微偏析形成

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摘要

The effect of a steady magnetic field (SMF) on microsegregation in the AI-4.5mass%Cu alloy during equiaxed solidification was investigated experimentally. It was found that the amount of microsegregation increased with increasing the SMF intensity at the same cooling rate. The variation of the microsegregation level with the SMF intensity at different cooling rates showed the consistent tendency. The effect of the change in various factors such as diffusivity in the solid phase, dendrite coarsening and undercooling on the microsegregation behavior was analyzed. The reduction of diffusivity in the solid phase in the SMF increased the microsegregation level. The increase in average nucleation undercooling of primary Al phase in the SMF, which was examined by the differential thermal analysis (DTA), led to decrease the amount of microsegregation. The enhancement of coarsening kinetics in the SMF increased the microsegregation level. Under the combined action of various factors, it was found that the increase in microsegregation in the range of the cooling rates under investigation was mainly attributed to the increase of the secondary dendrite arm spacing (SDAS) and the decrease in solid diffusion coefficient induced by the SMF.
机译：实验研究了等轴凝固过程中稳定磁场（SMF）对AI-4.5mass％Cu合金中微观偏析的影响。发现在相同冷却速率下，随着SMF强度的增加，微偏析的数量增加。在不同冷却速率下，微观偏析水平随SMF强度的变化表现出一致的趋势。分析了固相扩散率，枝晶粗化和过冷等各种因素的变化对微偏析行为的影响。 SMF中固相扩散率的降低提高了微偏析水平。通过差热分析（​​DTA）检验，SMF中初级Al相的平均成核过冷度增加，导致微偏析量减少。 SMF中粗化动力学的增强增加了微偏析水平。在各种因素的共同作用下，发现在所研究的冷却速率范围内，微观偏析的增加主要归因于二次枝晶臂间距（SDAS）的增加和由合金引起的固体扩散系数的降低。 SMF。

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  • 来源
    《ISIJ international》 |2018年第5期|899-904|共6页
  • 作者

    Shengya HE; Chuanjun LI; Rui GUO; Weidong XUAN; Zhongming REN; Xi LI; Yunbo ZHONG;

  • 作者单位

    State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai, 200072 P. R. China;

    State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai, 200072 P. R. China;

    State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai, 200072 P. R. China;

    State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai, 200072 P. R. China;

    State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai, 200072 P. R. China;

    State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai, 200072 P. R. China;

    State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai, 200072 P. R. China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    microsegregation; diffusion; dendrite coarsening; magnetic field; solidification;

    机译：微偏析扩散;枝晶粗化磁场;凝固;

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