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固溶态Mg-Gd-Y-Nd合金强流脉冲电子束表面改性

, PP. 1200-1205

Keywords: 金属材料,强流脉冲电子束(HCPEB),Mg-Gd-Y-Nd合金,表面微观结构,显微硬度,抗腐蚀性能

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Abstract:

利用强流脉冲电子束(HCPEB)对固溶态Mg-Gd-Y-Nd合金进行表面辐照处理。利用X射线衍射仪(XRD)、光学显微镜(OM)、扫描电子显微镜(SEM)对辐照前后样品的微观结构进行表征,并考察了HCPEB辐照处理后样品表面的显微硬度和腐蚀性能。实验结果表明:HCPEB处理后样品表面发生重熔并形成表面熔坑,随着脉冲次数的增加,熔坑密度逐渐减小;HCPEB处理后样品表面显微硬度显著提高。此外,电化学实验结果表明HCPEB表面处理后Mg-Gd-Y-Nd合金表面的抗腐蚀性能也得到明显的改善。表层晶粒细化、重熔层的形成和稀土元素的固溶强化效应是硬度提高和腐蚀性能改善的主要原因。

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