Grain Refinement of Mg₉₇Y₂Cu₁ Alloy Solidified with Pulsed Direct Current Magnetic Field

Abstract:

The influences of different pulse voltage, discharging frequency, pouring temperature and mold temperature on marostructure of Mg₉₇Y₂Cu₁ alloy under pulsed direct current magnetic field (PDCMF) were studied and the related mechanism was also discussed. The results show that grains of Mg₉₇Y₂Cu₁ alloy can be refined greatly by PDCMF treatment. Macrostructure of the alloy is changed from coarsened grains to complete fine equiaxed grains. When the pulse voltage is at 0-250V, grain size of the alloy decreases dramatically as pulse voltage increases. When the discharging frequency is at 1-10Hz, grain size of the alloy increases firstly, then decreases, and the turning point is 5 Hz. The change of grain size is not obvious, when the discharging frequency increases from 1 Hz to 5 Hz. When the discharging frequency reaches 10 Hz, the effect of grain refinement is the best. When the mold temperature is at 20-600°C or the pouring temperature is at 660-750°C, grain size of the alloy with PDCMF treatment decreases grossly with the increase of the mold temperature or the pouring temperature. The higher the pouring temperature or the mold temperature, the better the effect of grain refinement with PDCMF treatment.

• Periodical: Advanced Materials Research (Volume 842)
• Pages: 279-283
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.842.279
• Online since: November 2013
• Authors: Shui Lin Tan, Quan Zhou*, Jia Bin Fu, Hao Fu
• Keywords: Grain Refinement, Mg₉₇Y₂Cu₁ Alloy, Pulsed Direct Current Magnetic Field

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