NbAl_3强化Al-Nb熔覆层的组织与性能  

Microstructure and properties of cladded Al-Nb layers reinforced by NbAl_3

作　　者：郑孝义[1] 孙大千[1] 李欣[1] 都桂刚 辛伟达 任振安[1] ZHENG Xiao-yi, SUN Da-qian, LI Xin, DU Gui-gang, XIN Wei-da, REN Zhen-an(College of Materials Science and Engineering, Jilin University, Changchun 130022,China)

机构地区：[1]吉林大学材料科学与工程学院,长春130022

出　　处：《吉林大学学报（工学版）》2018年第5期1531-1536,共6页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51101072);吉林省科技发展计划项目(20150520024JH)

摘　　要：为提高铝基体的耐磨性,采用预敷铌和铝混合粉后进行双氩弧熔覆,在不同氩弧电流下制备Al-Nb熔覆层。金相分析及显微硬度与耐磨性测试表明,熔覆层由α-Al、NbAl_3和少量Nb组成。分析了枝晶组织中与富Nb区边缘的NbAl_3相形成机理。氩弧电流增大使NbAl_3相和树枝晶组织减少,α-Al固溶体增多,熔覆层的显微硬度和耐磨性下降。氩弧电流为100A时,熔覆层的显微硬度均值最高,耐磨性最好。To improve the wear resistance of aluminum substrate,Al-Nb cladded layers were prepared by double argon arc cladding method at different currents with pre-coated niobium and aluminum mixed powder.The metallographic analysis and the test results on microhardness and wear resistance show that the cladded layers consist ofα-Al,NbAl3 and a small amount of niobium phases.Also,the formation mechanism of NbAl3 phase was analyzed which grew in the dendrites and distributed on the edge of the rich niobium zone.The increase in argon arc currents results in less NbAl3 phase and dendrites but moreα-Al solid solution resistance,which reduces the microhardness and deteriorates the wear resistance of the cladded layers.The average microhardness peak and the best wear resistance were achieved when the argon arc current was 100 A.

关 键 词：材料表面与界面 氩弧熔覆 金属间化合物 微观组织 相对耐磨性 

分 类 号：TG174[金属学及工艺—金属表面处理]