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通过观察纯铝的宏观形貌并测试其力学性能来研究电脉冲-超声复合场对纯铝凝固的影响。结果表明,经复合场(电脉冲:电压10 V,占空比60%,频率50 Hz。超声:2 k W,20 KHz)处理后的纯铝试样纵截面和横截面的等轴晶面积分别比无外场时提升了50.21%和47.22%;细化晶粒的效果明显,且比单一场时的效果好,晶粒平均面积分别由556、529μm2降为64、80μm2。复合场下纯铝的力学性能与无外场、相比,硬度提高了28%、抗拉强度提高了15.9%、伸长率提高了12.83%。
The effect of electric pulse-ultrasonic composite field on the solidification of pure aluminum was studied by observing the macroscopic morphology of pure aluminum and testing its mechanical properties. The results show that the equiaxed crystal area of the longitudinal section and the cross section of the pure aluminum sample after the composite field (electric pulse: voltage of 10 V, duty ratio of 60%, frequency of 50 Hz, ultrasonic wave of 2 kW, 20 KHz) Respectively, increased by 50.21% and 47.22% respectively when compared with no external field. The effect of grain refinement was obvious and the effect was better than that of single field. The average grain area decreased from 556,529μm2 to 64,80μm2 respectively. The mechanical properties of pure aluminum in the composite field are 28% higher than those without the field, the tensile strength is increased by 15.9% and the elongation is increased by 12.83%.