Tribological behaviour of biomedical Ti–Zr-based shape memory alloys  

作　　者：Wen-Tao Qu Xu-Guang Sun Bi-Fei Yuan Kang-Ming Li Zhen-Guo Wang Yan Li 

机构地区：[1]School of Mechanical Engineering, Xi'an Shiyou University,Xi'an 710065, China [2]School of Materials Science and Engineering, Beihang University, Beijing 100191, China [3]Key Laboratory of Aerospace Materials and Performance(Ministry of Education), Beihang University, Beijing 100191China

出　　处：《Rare Metals》2017年第6期478-484,共7页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51371016 and 51401027);the China Postdoctoral Science Foundation Funded Project (No.2016M591040)

摘　　要：The tribological behaviour of Ti-30Zr, Ti-20Zr-10Nb and Ti-19Zr-10Nb-1Fe alloys was investigated using reciprocating friction and wear tests. X-ray diffraction（XRD） results indicate that Ti-30Zr, Ti-20Zr-10Nb and Ti-19Zr-10Nb-1Fe alloys are composed of hexagonal a＇-martensite, orthorhombic a＇＇-martensite and bcc β phases,respectively. Ti-30Zr alloy has the highest hardness of HV（273.1 ± 9.3）, while Ti-20Zr-10Nb alloy exhibits the lowest hardness of HV（235.2 ± 20.4） among all the alloys.The tribological results indicate that Ti-30Zr alloy shows the best wear resistance among these alloys, corresponding to the minimum average friction coefficient of 0.052 and the lowest wear rate of 6.4x10^-4mm3·N^-1·m^-1. Ti-20Zr-10Nb alloy displays better wear resistance than Ti-19Zr-10Nb-1Fe alloy, because the iron oxide is easy to fall off and less Nb2O5 films form on the worn surface of the latter.Delamination and abrasive wear in association with adhesive wear are the main wear mechanism of these alloys.The tribological behaviour of Ti-30Zr, Ti-20Zr-10Nb and Ti-19Zr-10Nb-1Fe alloys was investigated using reciprocating friction and wear tests. X-ray diffraction（XRD） results indicate that Ti-30Zr, Ti-20Zr-10Nb and Ti-19Zr-10Nb-1Fe alloys are composed of hexagonal a＇-martensite, orthorhombic a＇＇-martensite and bcc β phases,respectively. Ti-30Zr alloy has the highest hardness of HV（273.1 ± 9.3）, while Ti-20Zr-10Nb alloy exhibits the lowest hardness of HV（235.2 ± 20.4） among all the alloys.The tribological results indicate that Ti-30Zr alloy shows the best wear resistance among these alloys, corresponding to the minimum average friction coefficient of 0.052 and the lowest wear rate of 6.4x10^-4mm3·N^-1·m^-1. Ti-20Zr-10Nb alloy displays better wear resistance than Ti-19Zr-10Nb-1Fe alloy, because the iron oxide is easy to fall off and less Nb2O5 films form on the worn surface of the latter.Delamination and abrasive wear in association with adhesive wear are the main wear mechanism of these alloys.

关 键 词：Biomedical material Shape memory alloyTi-Zr TRIBOLOGY 

分 类 号：R318.08[医药卫生—生物医学工程] TG139.6[医药卫生—基础医学]