Laser directed energy deposited, ultrafine-grained functional titanium-copper alloys tailored for marine environments: Antibacterial and anti-microbial corrosion studies  

作　　者：Jiaqi Li Duyao Zhang Xiaobo Chen Dake Xu Dong Qiu Fuhui Wang Mark Easton 

机构地区：[1]Shenyang National Laboratory for Materials Science,Northeastern University,Shenyang 110819,China [2]Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China [3]School of Engineering,Centre for Additive Manufacturing,RMIT University,Melbourne,VIC 3000,Australia

出　　处：《Journal of Materials Science & Technology》2023年第35期21-33,共13页材料科学技术（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(No.U2006219);the National Key Re-search and Development Program of China(No.2020YFA0907300);the Fundamental Research Funds for the Central Universities of the Ministry of Education of China(Nos.N2102009 and N2002019);the Liaoning Revitalization Talents Program(No.XLYC1907158).The authors acknowledge the facilities,and the scientific and techni-cal assistance of the RMIT Digital Manufacturing Facility(DMF)and the RMIT Microscopy&Microanalysis Facility(RMMF).D.Z.would like to thank the support of ARC-DECRA grant(No.DE210101503);D.Q.and M.E.appreciate the financial support of ARC Discovery grant(No.DP220101501).

摘　　要：The microorganism-rich nature of the ocean imposes great challenges to the structural integrity of met-als over their service lifespan,including titanium(Ti)alloys,which are usually prone to microbiologically influenced corrosion(MIC).So,multifunctional anti-MIC Ti alloys need to be developed and studied.This paper investigates the effect of copper(Cu)concentration on the MIC resistance of a series of additively manufactured,ultrafine-grained Ti-x Cu(x=3.5,6.5 and 8.5 in wt.%)alloys.The dependence of the cor-rosion resistance and MIC resistance on the Cu concentration of Ti-Cu alloy is interpreted considering all conceivable mechanisms.The mechanisms for excellent corrosion resistance of Ti-Cu alloy in seawater are attributed to the strong passive film and small surface potential difference between phases.Microstruc-tural characterization reveals that uniformly distributed,nanosized Ti_(2) Cu phase led to increased reactive oxygen species in the bacterial membrane,which is the root reason for the superb anti-bacterial property(99.2%)for Ti-8.5Cu.Compared to pure Ti and Ti-6Al-4V,Ti-8.5Cu alloy features both high strength(yield stress>1000 MPa)and the best MIC resistance(97.5%).The combination of such balanced properties enables this functional 3D printed Ti-Cu alloy to become an ideal material for load-bearing applications in the marine environment.

关 键 词：Multifunctional titanium alloys Additive manufacturing Ultrafine grains Microbiologically influenced corrosion resistance Mechanical property Antibacterial property 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TG142.1[一般工业技术—材料科学与工程]