【作者】 高波； 郝仪； 田小梅； 赵铁钧； 涂赣峰； 孙树臣； 邢鹏飞；

【Author】 GAO Bo HAO Yi HAN Xiao-mei ZHAO Tie-jun TU Gan-feng SUN Shu-chen XING Peng-fei (School of materials and metallurgy,Northeastern University,Shenyang,China,110004)

【机构】 东北大学材料与冶金学院；

【摘要】 本文以提高过共晶铝硅二元合金Al-17.5Si耐磨、耐蚀性为目的,采用强流脉冲电子束技术对Al-17.5Si过共晶铝硅合金进行表面改性。结果表明:强流脉冲电子束处理实现Al-17.5Si铝硅合金表面快速熔凝,显著细化改性层内晶粒尺寸,提高合金元素Si的固溶度;Si元素在合金中弥散分布,合金成分均匀化。性能测试结果显示:合金摩擦系数降低,磨损量减小,耐磨性能提高。动电位极化曲线测试结果显示:与处理前相比,维钝电流密度约降低一个数量级,合金耐蚀性能明显提高。实验结果显示了强流脉冲电子束良好的应用前景。更多还原

【Abstract】 In the present work,the HCPEB technique was employed to modify the surface of Al-17.5Si hypereutectic alloy with the aim of improving the corrosion and wear resistance of the alloy.The main results are summarized as follows:HCPEB treatment induced the Al-17.5Si alloy surface rapid melting and solidification.As a result,grains of remelted layer have been significantly refined,content of Si inα(Al) solid solutions was improved and Si element distribution in the alloys intended to be homogenous.Friction and wear test results show that friction coefficient of the alloy decreased and wear resistance was improved after HCPEB treatment According to potential-dynamic polarization curves measurement,the treated samples exhibited an improved corrosion resistance in 3.5%NaCl solution.Compared with the initial samples,the corrosion current density of Al-17.5%Si alloy decreases about one order,and the corrosion rate of the treated alloy decreases 13.4%.Corrosion resistance of the modified alloy could be improved by one order of magnitude.It can be deduced that HCPEB will have a good application future in surface modification of metallic materials.更多还原