Effects of compound treatment of pulsed magnetic field and mechanical vibration on solidified structure of Mg_(97)Y_2Cu_1 alloy

摘要

The influences of different pulse voltage, pulse frequency, pouring temperature and mold temperature on solidified structure of Mg_(97)Y_2Cu_1 alloy reinforced by long-period ordered structure with compound treatment of pulsed magnetic field and mechanical vibration were studied. The results show that grains of the alloy can be refined greatly with compound treatment. Primary phase degrades from developed dendrites into rosette-shaped crystal. Distribution of second phase is more uniform and continuous, and its volume fraction increases. When the pulse voltage is at 0-280V or the pulse frequency is at 1-10Hz, grain size of the alloy decreases dramatically as pulse voltage or pulse frequency increases. When the pouring temperature is at 660-750°C or the mold temperature is at 20-600 °C, grain size of the alloy with compound treatment decreases grossly with the increase of the pouring temperature or the mold temperature.