摘要
A ternary Ti35Zr28Nb alloy was fabricated by powder metallurgy(PM)from pre-alloyed powder.The microstructure,hardness,corrosion behavior,and wear response of the produced alloy were investigated systematically.The results show that nearly full dense Ti35Zr28Nb alloy(relative density is 98.1±1.2%)can be fabricated by PM.The microstructure was dominated with uniform phase.The Ti35Zr28Nb alloy displayed spontaneous passivity in a naturally aerated simulated body fluid(SBF)solution at 37±0.5°C.The Ti35Zr28Nb alloy exhibited the highest corrosion resistance as compared to as-cast Ti6Al4V and pure Ti because of the formation of a protective passive film containing TiO2,Nb2O5,and ZrO2,including the highest corrosion potential(-0.22±0.01 V),the lowest corrosion current density(57.45±1.88 nA),the lowest passive potential(0.05±0.01 V)and the widest passivation range(1.29±0.09 V).Under the same wear condition,the wear rate of the Ti35Zr28Nb alloy(0.0021±0.0002 mm3/m·N)was lower than that of the CP Ti(0.0029±0.0004 mm3/m·N)and close to that of the Ti6Al4V(0.0020±0.0003 mm3/m·N).The wear mechanism of the Ti35Zr28Nb alloy was mainly dominated by abrasive wear,accompanied by adhesive wear.The highest corrosion resistance together with the adequate wear resistance makes the PM-fabricated Ti35Zr28Nb alloy an attractive candidate for orthopedic implant materials.
A ternary Ti35Zr28Nb alloy was fabricated by powder metallurgy（PM） from pre-alloyed powder. The microstructure, hardness, corrosion behavior, and wear response of the produced alloy were investigated systematically. The results show that nearly full dense Ti35Zr28Nb alloy（relative density is 98.1 ± 1.2 %）can be fabricated by PM. The microstructure was dominated with uniform phase. The Ti35Zr28Nb alloy displayed spontaneous passivity in a naturally aerated simulated body fluid（SBF） solution at 37 ± 0.5°C.The Ti35Zr28Nb alloy exhibited the highest corrosion resistance as compared to as-cast Ti6Al4V and pure Ti because of the formation of a protective passive film containing TiO2, Nb2O5, and ZrO2, including the highest corrosion potential（-0.22 ± 0.01 V）, the lowest corrosion current density（57.45 ± 1.88 nA）, the lowest passive potential（0.05 ± 0.01 V） and the widest passivation range（1.29 ± 0.09 V）. Under the same wear condition, the wear rate of the Ti35Zr28Nb alloy（0.0021 ± 0.0002 mm3/m·N） was lower than that of the CP Ti（0.0029 ± 0.0004 mm3/m·N） and close to that of the Ti6Al4V（0.0020 ± 0.0003 mm3/m·N）.The wear mechanism of the Ti35Zr28Nb alloy was mainly dominated by abrasive wear, accompanied by adhesive wear. The highest corrosion resistance together with the adequate wear resistance makes the PM-fabricated Ti35Zr28Nb alloy an attractive candidate for orthopedic implant materials.
基金
supported by the National Natural Science Foundation of China(51874037)
13th Five-Year Weapons Innovation Foundation of China(6141B012807)
State Key Lab of Advanced Metals and Materials,University of Science and Technology Beijing(2019-Z14)
the financial support for this research by the National Health and Medical Research Council(NHMRC),Australia through project grant(GNT1087290).
作者简介
Corresponding author:Xin Lu,E-mail address:luxin@ustb.edu.cn(X.Lu).
