Cr-CrN-Cr-CrAlN多层膜对TC4钛合金力学性能的影响  

Effects of Cr-CrN-Cr-CrAlN Multilayer Film on Mechanical Properties of TC4 Titanium Alloy

作　　者：张东波 林松盛 蔡伟通 苏一凡 林凯生 ZHANG Dongbo;LIN Songsheng;CAI Weitong;SU Yifan;LIN Kaisheng(School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,China;Guangdong Provincial Key Laboratory of Modern Surface Engineering Technology,National Engineering Laboratory of Modern Materials Surface Engineering Technology,Institute of New Materials,Guangdong Academy of Sciences,Guangzhou 510650,China)

机构地区：[1]广东工业大学材料与能源学院,广东广州510006 [2]广东省科学院新材料研究所,现代材料表面工程技术国家工程实验室,广东省现代表面工程技术重点实验室,广东广州510650

出　　处：《材料保护》2024年第7期14-22,共9页Materials Protection

基　　金：广东省特支计划团队项目(2019BT02C629);广东省科技项目(2023B212060045);广东省科学院发展专项资金项目(2022GDASZH-2022010109)。

摘　　要：为了提高钛合金基体的表面抗冲蚀性能,并研究Cr基多层膜对钛合金基体的疲劳力学性能的影响,采用真空阴极电弧沉积技术在TC4钛合金表面沉积3.99,6.85,9.62μm 3种厚度的Cr-CrN-Cr-CrAlN多层膜。主要通过拉伸试验和轴向加载疲劳试验,研究对比了室温下TC4钛合金基体与膜层试样的轴向拉伸性能和轴向高低周疲劳性能。结果表明:在TC4钛合金表面所制备的3种Cr-CrN-Cr-CrAlN多层膜的厚度分别约为3.99、6.85和9.62μm,硬度分别为2455、3024和3578 HV,膜基结合力则分别为12.4、15.2和20.1 N。镀多层膜后提高了TC4钛合金的拉伸屈服强度、抗拉强度和弹性模量,而降低了断裂伸长率。经镀6.85μm的多层膜后,TC4钛合金的轴向高周疲劳极限下降了4.15%,镀膜对高周疲劳性能影响较小;而低周疲劳性能影响则较大,50000次寿命对应的疲劳强度降低了约21.04%。In order to improve the surface erosion resistance of titanium alloy substrate and study the effect of Cr based multilayer film on the fatigue mechanical properties of titanium alloy substrate,three kinds of Cr-CrN-Cr-CrAlN multilayer film with different thickness(3.99,6.85,9.62μm)were deposited on the surface of TC4 titanium alloy by vacuum cathodic arc deposition technology.The axial tensile performance and axial high low cycle fatigue performance of TC4 titanium alloy substrate and the film specimens at room temperature were studied and compared mainly through tensile tests and axial loading fatigue tests.Results showed that the thicknesses of Cr-CrN-Cr-CrAlN multilayer film prepared on the surface of TC4 titanium alloy were approximately 3.99,6.85 and 9.62μm,respectively.Moreover,the corresponding hardnesses were 2455,3024 and 3578 HV,and the adhesion forces of film-substrate were 12.4,15.2 and 20.1 N,respectively.After coated with multiple layers,the tensile yield strength,tensile strength and elastic modulus of TC4 titanium alloy were improved,while the elongation at break was reduced.The multilayer film with 6.85μm decreased the axial high cycle fatigue limit of TC4 titanium alloy by 4.15%,and the film had little effect on the high cycle fatigue performance.Besides,the effect of film on the low cycle fatigue performance was significant,with a decrease of approximately 21.04%in fatigue strength corresponding to a lifespan of 50000 cycles.

关 键 词：Cr-CrN-Cr-CrAlN多层膜 钛合金 拉伸性能 疲劳性能 电弧离子镀 

分 类 号：TG174.4[金属学及工艺—金属表面处理]