摘要
In order to study the effect of element Nb on the microstructure and properties of the biomedical β-type Ti-Mo based alloys,Ti-15Mo-xNb（x=5,10,15 and 20 in %） alloys were investigated.The dry wear resistance of β-type Ti-15Mo-xNb alloys against Gr15 ball was investigated on CJS111A ball-disk wear instrument.Experimental results indicate that crystal structure and morphology of the Ti-15Mo-xNb alloys are sensitive to their Nb contents.Ti-15Mo-xNb alloys match those for β phase peaks and no any phases are found.The Vickers hardness values of all the Ti-15Mo-xNb alloys are higher than HV200.The compression yield strength of the Ti-15Mo-5Nb alloy is the lowest and that of the Ti-15Mo-10Nb alloy is the highest.For all the Ti-15Mo-xNb alloys,the friction coefficient is not constant but takes a higher value.In dry condition,SEM study reveals deep parallel scars on the wear surfaces of all the Ti-15Mo-xNb alloys under different loads.The friction coefficient of the Ti-15Mo-5Nb alloy under 1 N is the lowest.The wear principal mechanism for Ti-15Mo-xNb alloys is adhesive wear.
为了研究元素Nb含量对β型Ti-Mo基合金显微组织和性能的影响,制备了4种Ti-15Mo-xNb(x=5%,10%,15%和20%)合金,并研究其显微组织和性能。采用CJS111A型球-盘式摩擦磨损试验机评价了Ti-15Mo-xNb合金与Gr15对磨时的干摩擦磨损性能。结果表明:Nb含量对Ti-15Mo-xNb合金显微组织结构形态的影响较大,4种合金主要由β相组成,其硬度值均高于HV200;Ti-15Mo-5Nb合金的压缩屈服强度最低,Ti-15Mo-10Nb合金的压缩屈服强度最高;在干磨状态下Ti-15Mo-xNb合金的摩擦因数不稳定但其值较高;在不同的加载条件下,磨损表面均出现了较深的平行磨痕,在加载载荷为1N时Ti-15Mo-5Nb合金的摩擦因数最低;Ti-15Mo-xNb合金的磨损机制为粘着磨损。
基金
Project(20080440850) supported by China Postdoctoral Science Foundation
Project(ZJY0605-02) supported by the Natural Science Foundation of Heilongjiang Province,China
Project(HIT.NSRIF.2012002) supported by the Fundamental Research Funds for the Central Universities,China
