电子束表面改性对变形镁合金AZ31结构和性能的影响

Effect of HCPEB surface modification on microstructure and properties of wrought Mg alloy AZ31

本文用强流脉冲电子束对变形镁合金AZ31进行表面处理。用光学显微镜、扫描电镜和X射线衍射分析表面处理层形貌和组织结构,并测试显微硬度和摩擦磨损性能。结果表明,处理样品表面完全重熔,残存有数百MPa压应力,且随脉冲次数增加,改性层加深,距表面数百μm范围内显微硬度均呈增加,15次脉冲处理后样品相对抗磨性提高5.6倍。

Wrought magnesium alloy AZ31 samples were bombarded by high current pulsed electron beam （HCPEB）, so as to improve the material＇s performance of sliding friction and wear resistance. The modified surface layer was characterized using optical microscope, scanning electron microscope and X-ray diffraction. Mechanical properties of microhardness and wear resistance were investigated in detail. The results show that the surface of HCPEB-treated samples melted completely and remained a stress in hundreds of MPa. Also, treated by pulses of increased numbers, microhardness of the sample surface increased in extended depths in hundreds of micrometers. After HCPEB treatment of 15 pulses, wear resistance ofsarnple is 5.6 times greater than the virgin sample.