合金化组元(Al,Cr,Si,Ti)含量对激光沉积(FeNiCo)-(AlCrSiTi)非等原子比多组元合金涂层组织与力学性能的影响  

Effect of alloying components(Al,Cr,Si,Ti)content on microstructure and mechanical properties of non-equiatomic(FeNiCo)-(AlCrSiTi)multicomponent alloy coatings manufactured by laser deposition

作　　者：唐延川 万能 唐兴昌 刘德佳[1,2] 焦海涛 胡勇 赵龙志[1,2] TANG Yan-chuan;WAN Neng;TANG Xing-chang;LIU De-jia;JIAO Hai-tao;HU Yong;ZHAO Long-zhi(Key Laboratory of Advanced Materials for Vehicles&Laser Additive Manufacturing of Nanchang City,East China Jiaotong University,Nanchang 330013,China;School of Materials Science and Engineering,East China Jiaotong University,Nanchang 330013,China;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]华东交通大学载运工具先进材料与激光增材制造南昌市重点实验室,南昌330013 [2]华东交通大学材料科学与工程学院,南昌330013 [3]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050 [4]兰州理工大学材料科学与工程学院,兰州730050

出　　处：《材料工程》2021年第7期92-102,共11页Journal of Materials Engineering

基　　金：国家自然科学基金(51701074,51865011);江西省自然科学基金(20181BAB216003);江西省教育厅科学技术研究项目(GJJ170407)。

摘　　要：采用激光沉积制备不同含量合金化组元(Al,Cr,Si,Ti)的(FeNiCo)-(AlCrSiTi)多组元合金涂层,研究合金化组元含量对涂层组织与力学性能的影响。结果表明:随着合金化组元(Al,Cr,Si,Ti)含量的增加,涂层中面心立方(FCC)相含量逐渐降低,由FCC相+体心立方(BCC)相的双相结构转变为以BCC相为主的结构,且BCC相内纳米析出相颗粒密度显著增加,颗粒平均尺寸由97 nm降低至36 nm;同时,随着合金化组元含量的增加,涂层中等轴晶组织区域面积增大,等轴晶显著细化,平均晶粒尺寸最小仅为10.8μm;涂层截面平均显微硬度由271HV 0.1上升至718HV 0.1,但涂层抗弯强度由2208 MPa降低至1374 MPa,所能承受的最大弯曲应变也由7.3%降低至0.47%。(FeNiCo)-(AlCrSiTi)multicomponent alloy coatings with different contents of alloying components(Al,Cr,Si,Ti)were manufactured by laser deposition.The effect of the alloying components content on the microstructure and mechanical properties of the coatings was investigated.The results show that the content of face-centered cubic(FCC)phase in the coatings decreases gradually and the microstructure is changed from FCC phase+body-centered cubic(BCC)phase to BCC phase dominated with the increase of alloying components(Al,Cr,Si,Ti)content.Moreover,the density of nano-precipitation particles in the BCC phase increases significantly and the average size of the nano-precipitation particles decreases from 97 nm to 36 nm.Meanwhile,with the increase of alloying components content,the area of equiaxed grain microstructure in the coatings increases and the equiaxed grains become much finer,with the minimum average grain size of only 10.8μm.Furthermore,the microhardness of the coating cross section increases from 271HV 0.1 to 718HV 0.1.However,the bending strength of the coating decreases from 2208 MPa to 1374 MPa and the maximum bending strain also decreases from 7.3%to 0.47%.

关 键 词：激光沉积 多组元合金 柱状晶/等轴晶转变 成分过冷 纳米析出相 力学性能 

分 类 号：TG139[一般工业技术—材料科学与工程] TG665[金属学及工艺—合金]