Age-hardening behavior,corrosion mechanisms,and passive film structure of nanocrystalline Al-V supersaturated solid solution  

作　　者：J.Christudasjustus M.R.Felde C.S.Witharamage J.Esquivel A.A.Darwish C.Winkler R.K.Gupta 

机构地区：[1]Department of Materials Science and Engineering,North Carolina State University,Raleigh,NC 27606,United States [2]Department of Chemical,Biomolecular and Corrosion Engineering,The University of Akron,Akron,OH 44325,United States

出　　处：《Journal of Materials Science & Technology》2023年第4期1-12,共12页材料科学技术（英文版）

基　　金：The authors would like to acknowledge the financial support received from the National Science Foundation(Nos.NSF-CMMI 1760204 and NSF-CMMI 2131440)under the direction of Dr.Alexis Lewis.This work was performed in part at the Analytical Instrumentation Facility(AIF)at North Carolina State University,supported by the State of North Carolina and the National Science Foundation(award number ECCS-2025064).The AIF is a member of the North Carolina Research Triangle Nanotechnology Network(RTNN),a site in the National Nanotechnology Coordinated Infras-tructure(NNCI).

摘　　要：The effect of age-hardening on microstructure,hardness,and corrosion of an Al-5at.%V alloy,produced us-ing high-energy ball milling and subsequent cold compaction,has been investigated.The alloy exhibited a grain size below 100 nm and extremely high solid solubility of V in Al(3.1 at.%).The age-hardening was carried out at 150,200,and 250℃.The peak-aged condition of 150℃ demonstrated the highest hardness-transpired from grain refinement,precipitation,and solid solution hardening.The corrosion re-sistance of the Al-5at.%V alloy was studied as a function of aging conditions.The peak-aged condition retained the corrosion resistance while it deteriorated in the over-aged condition.Nonetheless,the cor-rosion resistance of the ball-milled Al alloys in all the aging conditions was superior to that of pure Al.The passive film structure and origin of corrosion were studied using scanning/transmission electron mi-croscopy(S/TEM).The high corrosion resistance of the alloy was attributed to the V enrichment at the film/metal interface and deposition of V on the cathodic phases,which suppresses the dissolution of Al within the pit and therefore promotes repassivation in the early stages of corrosion.

关 键 词：Al alloys Nanocrystalline alloy AGE-HARDENING Ball milling CORROSION HARDNESS 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TB383.1[金属学及工艺—金属材料]