Fretting-corrosion mechanisms of Ti6Al4V against CoCrMo in simulated body fluid under various fretting states  

作　　者：Jian PU Zupei ZHANG Yali ZHANG Xiaogang ZHANG Xinlu YUAN Xiaoyu ZHANG Guoxian ZHANG Wen CUI Shu YANG Zhongmin JIN 

机构地区：[1]School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China [2]School of Mechanical Engineering,Chengdu University,Chengdu 610106,China [3]Beijing AKEC Medical Co.,Ltd.,Beijing 102200,China [4]School of Materials Science and Engineering,Peking University,Beijing 100871,China [5]GBA Center for Medical Device Evaluation and Inspection,NMPA,Shenzhen 518000,China [6]School of Mechanical Engineering,University of Leeds,Leeds LS29JT,UK

出　　处：《Friction》2024年第12期2741-2759,共19页摩擦（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52035012 and 52275215);the Natural Science Foundation of Sichuan Province(No.2022NSFSC1940).

摘　　要：Ti6Al4V alloy‒CoCrMo alloy pair is commonly applied for modular head‒neck interfaces for artificial hip joint.Unfortunately,the fretting corrosion damage at this interface seriously restricts its lifespan.This work studied the fretting corrosion of Ti6Al4V‒CoCrMo pair in calf serum solution.We established this material pair’s running condition fretting map(RCFM)regarding load and displacement,and revealed the damage mechanism of this material pair in various fretting regimes,namely partial slip regime(PSR),mixed fretting regime(MFR),and gross slip regime(GSR).The damage mechanism of Ti6Al4V alloy was mainly abrasive wear induced by CoCrMo alloy and tribocorrosion.Adhesive wear(material transfer)also existed in MFR.The damage mechanism of CoCrMo alloy was mainly abrasive wear induced by metal oxides and tribocorrosion in GSR and MFR,while no apparent damage in PSR.Furthermore,a dense composite material layer with high hardness was formed in the middle contacting area in GSR,which reduced the corrosion and wear of Ti alloys and exacerbated damage to Co alloys.Finally,the ion concentration maps for Ti and Co ions were constructed,which displayed the transition in the amount of released Ti and Co ions under different displacements and loads.

关 键 词：fretting corrosion Ti6Al4V alloy CoCrMo alloy composite material layer damage mechanism metal ion release 

分 类 号：TH117[机械工程—机械设计及理论]