Effects of ultrasonic on morphologies of primary Mg2Si crystals in in-situ Mg2Si/A1 composite were investigated by metallographic microscopy and field emission scanning electron microscopy. The results show that the m...Effects of ultrasonic on morphologies of primary Mg2Si crystals in in-situ Mg2Si/A1 composite were investigated by metallographic microscopy and field emission scanning electron microscopy. The results show that the mean grain size of primary MgESi crystals is refined from 150 to 20 μm by high intensity ultrasonic, and the morphologies of primary MgESi crystals are changed as well. Optical microscopy reveals that primary MgESi crystals without ultrasonic vibration exhibit coarse particles with cavities, in which eutectic structures grow. However, primary Mg2Si crystals with ultrasonic vibration appear fine grains without any cavity. Three-dimensional morphologies of primary Mg2Si without ultrasonic vibration display octahedron and tetrakaidecahedron with hopper-like hole in the crystals. After ultrasonic vibration, primary Mg2Si particles become solid crystals with rounded comers and edges.展开更多
对2A70-0.5Ce0.25Ti铝合金叶片试件进行了模锻,并进行了不同始锻温度下的耐磨损性能和耐腐蚀性能的测试和分析。结果表明:随始锻温度从440℃升高到490℃,试样的磨损体积先减小后增大,腐蚀电位先正移后负移,耐磨损性能和耐腐蚀性能先提...对2A70-0.5Ce0.25Ti铝合金叶片试件进行了模锻,并进行了不同始锻温度下的耐磨损性能和耐腐蚀性能的测试和分析。结果表明:随始锻温度从440℃升高到490℃,试样的磨损体积先减小后增大,腐蚀电位先正移后负移,耐磨损性能和耐腐蚀性能先提升后下降。与440℃始锻温度的试样性能相比,480℃始锻后试样的磨损体积减小48.48%,腐蚀电位则正移78 m V。2A70-0.5Ce0.25Ti铝合金模锻叶片试样的始锻温度优选为480℃。展开更多
文摘Effects of ultrasonic on morphologies of primary Mg2Si crystals in in-situ Mg2Si/A1 composite were investigated by metallographic microscopy and field emission scanning electron microscopy. The results show that the mean grain size of primary MgESi crystals is refined from 150 to 20 μm by high intensity ultrasonic, and the morphologies of primary MgESi crystals are changed as well. Optical microscopy reveals that primary MgESi crystals without ultrasonic vibration exhibit coarse particles with cavities, in which eutectic structures grow. However, primary Mg2Si crystals with ultrasonic vibration appear fine grains without any cavity. Three-dimensional morphologies of primary Mg2Si without ultrasonic vibration display octahedron and tetrakaidecahedron with hopper-like hole in the crystals. After ultrasonic vibration, primary Mg2Si particles become solid crystals with rounded comers and edges.
文摘对2A70-0.5Ce0.25Ti铝合金叶片试件进行了模锻,并进行了不同始锻温度下的耐磨损性能和耐腐蚀性能的测试和分析。结果表明:随始锻温度从440℃升高到490℃,试样的磨损体积先减小后增大,腐蚀电位先正移后负移,耐磨损性能和耐腐蚀性能先提升后下降。与440℃始锻温度的试样性能相比,480℃始锻后试样的磨损体积减小48.48%,腐蚀电位则正移78 m V。2A70-0.5Ce0.25Ti铝合金模锻叶片试样的始锻温度优选为480℃。
