Grain Refinement of Al-Cu Alloy Under Low Voltage Pulsed Magnetic Field
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摘要: 在金属材料凝固过程中施加脉冲磁场,可获得晶粒细化的微观组织。本研究以Al-5%Cu为研究对象进行金属筛网试验,分别在纯液相区、液-固两相区和整个凝固过程阶段施加脉冲磁场,分析脉冲磁场的作用阶段以及脉冲磁场工艺参数对合金晶粒尺寸细化的影响。结果表明,在液-固两相区和整个凝固阶段施加脉冲磁场可获得明显的晶粒细化效果,说明脉冲磁场主要作用于金属材料的凝固形核过程。同时,随着磁场脉冲电压和脉冲频率的增大,晶粒尺寸呈先减小后保持不变的变化趋势。合金晶粒尺寸细化效果最佳的脉冲电磁工艺参数为:低压脉冲频率5.0~10.0 Hz,脉冲电压100 V。Abstract: The application of a pulsed magnetic field during the solidification process can refine the grains of the microstructure of material. In this study, the pulsed magnetic fields are applied in the pure liquid phase stage, liquid-solid two-phase stage, and the entire solidification process of Al-5%Cu alloy, to investigate in which stage the pulsed magnetic field functions and the influences of the process parameters of the pulsed magnetic field on grain refinement of alloy. It is found out that significant grain refinement effects are achieved when the pulsed magnetic fields are applied in the liquid-solid two-phase stage and the entire solidification process, indicating that the pulsed magnetic fields mainly act on the solidification nucleation process of materials. Besides, as the excitation voltage and magnetic field frequency increase, the grain refinement effect first increases and then remains unchanged. The optimized pulse electromagnetic parameters are that the frequency 5.0-10.0 Hz and the voltage 100 V.
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