强流脉冲电子束熔覆Al-Pb合金涂层的显微组织与摩擦磨损性能  

Microstructure and properties of friction and wear of Al-Pb alloy coatings by high current pulsed electron beam cladding

作　　者：诸华军 田娜娜 张从林 关庆丰[2] ZHU Huajun;TIAN Nana;ZHANG Conglin;GUAN Qingfeng(School of Materials Science and Engineering,Yancheng Institute of Technology,Yancheng 221051,Jiangsu,China;School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China)

机构地区：[1]盐城工学院材料科学与工程学院,江苏盐城221051 [2]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《材料工程》2023年第3期145-155,共11页Journal of Materials Engineering

基　　金：国家自然科学基金(52001273);江苏省自然科学基金青年基金(BK20201062)。

摘　　要：为改善Al-Pb合金的表面硬度和耐磨性能,利用强流脉冲电子束(high current pulsed electron beam,HCPEB)对涂敷在纯铝(Al)表面的铅(Pb)层进行辐照合金化处理,制备具有优异性能的Al-Pb合金化层。采用3D激光扫描显微系统(laser scanning microscope,LSM)测量表面粗糙度;利用带能谱仪(energy dispersive spectrometer,EDS)的场发射扫描电镜(scanning electron microscopy,SEM)分析辐照合金化前后Al-Pb涂层的微观形貌、结构与元素分布;随后使用X射线衍射仪(X-ray diffraction,XRD)观察合金层的物相组成;利用透射电镜(transmission electron microscope,TEM)精细表征Al-Pb合金层的微观结构,最后测试辐照前后样品表面的显微硬度、平均摩擦因数与磨损率并分析硬度及磨损增强机理,探究和总结材料表面性能强化机制,建立辐照合金层表面-微观组织-表面性能之间的内在联系。结果表明:经过HCPEB辐照处理后,Al基体与Pb涂层呈现良好的冶金结合,并在30次辐照后制备了10.2μm厚的Al-Pb合金层;与纯铝及原始涂层相比,辐照30次后(111)Al晶面衍射峰发生了宽化,同时衍射峰的位置也向低角度发生微小移动,这表明基体表面Al晶粒在HCPEB表面合金化处理后得到了显著的细化且晶胞发生膨胀,晶格常数增大;HCPEB诱发样品表面形成了亚晶、位错、位错胞、少量的Al(Pb)固溶体以及大量纳米级富Pb颗粒。性能测试结果表明,经电子束辐照后Al-Pb涂层表面的硬度和耐磨性显著提高。To improve the surface hardness and wear resistance of Al-Pb alloys,pure aluminum(Al)surfaces coated with lead(Pb)layers were irradiated by using high current pulsed electron beam(HCPEB)to prepare Al-Pb alloyed layers with excellent properties.The surface roughness of the alloying layer was observed by 3D laser scanning microscope(LSM).Meanwhile,the micro morphology,structure and element distribution of Al-Pb coating before and after irradiation alloying were analyzed by field emission scanning electron microscopy(SEM)with energy dispersive spectrometer(EDS).In addition,the phase composition of the alloy layer was observed by X-ray diffraction(XRD).Moreover,the surface microstructure after alloying was characterized by transmission electron microscopy(TEM).Finally,the microhardness,average friction coefficient and wear rate of the sample surface before and after irradiation were tested,and the hardness and wear enhancement mechanism were analyzed.The strengthening mechanism of the surface performance was also summarized.The internal relationship between surface microstructure and surface properties of irradiated coatings was established.The results show that after HCPEB irradiation treatment,the Al substrate and Pb coating show good metallurgical bonding,and after 30 times of irradiation,the Pb-Al alloying layer with a thickness of about 10.2μm is prepared.Compared with pure aluminum and the original coating,the diffraction peak of(111)Alcrystal plane is widened after 30 times of irradiation,and the position of the diffraction peak is also slightly shifted to the low angle direction,which means that the Al grains on the surface of the matrix are significantly refined after the surface alloying treatment of HCPEB,and the crystal cells expand,and the lattice constant increases.HCPEB induces the formation of sub crystals,dislocations,dislocation cells,a small amount of Al(Pb)solid solution and a large number of nanoscale Pb rich particles on the sample surface.The test results show that the hardness and wear resist

关 键 词：Al-Pb合金涂层 显微组织 强流脉冲电子束熔覆 性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]