强流脉冲电子束作用下TC4表面Cu合金化及性能的研究  

Alloying and Property of Cu on TC4 Induced by High Current Pulsed Electron Beam

作　　者：孙永兴 李绍伟[1] 张凌燕 彭敬敦 吕鹏[1] 关庆丰[1] SUN Tong-xing;LI Shao-wei;ZHANG Ling-yan;PENG Jing-dun;LYU Peng;GUAN Qing-feng(School of Material Science and Engineering,Jiangsu University,Zhenjiang 212013,China;School of Science,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]江苏大学材料与科学工程学院,江苏镇江212013 [2]南京理工大学理学院,南京210094

出　　处：《表面技术》2019年第12期271-280,303,共11页Surface Technology

基　　金：国家自然科学基金项目(51601071,51601072);江苏大学高级人才基金项目(14JDG127);江苏大学青年英才培育计划项目;江苏省自然科学基金青年基金(BK20160530)~~

摘　　要：目的提高TC4合金表面硬度、耐磨和耐腐蚀性能,拓宽其在工业领域的应用范围。方法利用强流脉冲电子束(HCPEB)对表面预置纯Cu粉末的TC4合金进行表面合金化处理。采用X射线衍射仪(XRD)、光学显微镜(OM)、激光共聚焦显微镜(LSM)、扫描电子显微镜(SEM)及透射电子显微镜(TEM)详细表征表面合金层的相组成和微观结构。结果HCPEB辐照合金化Cu处理后,样品表面形成数微米的合金层,主要存在相为α'、β、Cu Ti2和Al2Cu,主要组织为等轴晶β相和板条马氏体组织α'相。HCPEB辐照合金化过程中诱导表面产生位错和孪晶等变形结构。此外,显微硬度测试结果表明,HCPEB辐照合金化Cu处理后,样品表面硬度增加,其中30次辐照后,样品表面显微硬度达到最大,与原始样品相比提高了约17%。电化学实验结果表明,合金化处理后,样品表面腐蚀性能提高,与原始样品相比,30次辐照后,腐蚀电位提高302 mV,腐蚀电流密度降低3.397 A/cm^2,耐腐蚀性能最佳。摩擦磨损试验结果表明,合金化处理后,样品表面摩擦系数降低,磨损量减少,而30次辐照后,摩擦系数和磨损量达到最低,分别为0.36和2.959×10^-3 mm^3/(N·m),耐磨性得到提高。结论HCPEB辐照合金化Cu处理后,样品表面硬度、耐磨性和耐腐蚀性能提高,而30次辐照处理后样品的表面性能最佳。The work aims to enhance the surface hardness,wear resistance and corrosion resistance of TC4 alloy and broaden its application in the industrial field.The surface of TC4 alloy with preset pure Cu powder was treated by high current pulsed electron beam(HCPEB)apparatus.X-ray diffraction(XRD),optical microscopy(OM),Laser confocal microscope(LSM),scanning electron microscopy(SEM)and transmission electron microscopy(TEM)were used to characterize the phase composition and microstructure of the alloyed-layer on the surface.After irradiated alloying of Cu by HCPEB,an alloyed-layer of several microns was formed on the surface of the sample.The main phases were α',β,CuTi2 and Al2 Cu.The microstructure was composed of equiaxed β phase and lath martensite α' phase.The alloyed surface after HCPEB irradiation generated abundant deformed structure for dislocation and twins,et al.Furthermore,the microhardness test results showed that the surface hardness increased after Cu alloying by HCPEB irradiation,and reached the maximum after 30-pulsed irradiation,which was about 17%higher than that of initial sample.Meanwhile,the results of electrochemical experiment showed that the surface corrosion performance of the sample was improved after alloying treatment.Compared to initial sample,the corrosion potential was increased by 302 mV and the corrosion current density was decreased by 3.397 mA/cm^2 after 30-pulsesd irradiation.The friction and wear test results showed that the surface friction coefficient and wear rate of the sample were reduced after alloying treatment,and the friction coefficient and the wear rate were the lowest after 30-pulsed irradiation,respectively 0.36 and 2.959×10^-3 mm^3/(N·m),and the wear resistance was improved.The surface hardness,wear resistance and corrosion resistance of the samples after Cu alloying irradiated with HCPEB are improved,and the surface properties of the samples reach the best after 30-pulsed irradiation.

关 键 词：强流脉冲电子束 TC4合金 Cu合金化 耐腐蚀性 耐磨性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]