中文摘要：

以机械合金化＋放电等离子烧结（MA-SPS）制备的超细晶Ti-8Mo-3Fe合金为研究对象,研究了合金在模拟体液（SBF）中的摩擦磨损性能,并与放电等离子烧结制备的微米尺寸晶粒的Ti-8Mo-3Fe合金、铸造纯Ti及Ti-6Al-4V（TC4）合金进行了对比.结果表明：采用MA-SPS工艺可制备出高致密度、组织均匀的超细晶Ti-8Mo-3Fe合金,合金由β相及少量α相组成,平均晶粒尺寸为1.5μm,显微硬度为448 HV;在相同摩擦磨损条件下,超细晶Ti-8Mo-3Fe合金的摩损程度明显低于微米晶粒Ti-8Mo-3Fe和铸态的纯Ti及TC4合金,具有最低的磨损体积和较稳定的摩擦系数.超细晶Ti-8Mo-3Fe合金的磨损机制为磨粒磨损,而微米晶粒Ti-8Mo-3Fe和铸态纯Ti及TC4合金的磨损机制为磨粒磨损和黏着磨损并存的混合磨损.

英文摘要：

The friction and wear properties of ultrafine grain Ti-8Mo-3Fe alloy fabricated by mechanical alloying（ MA） and subsequent spark plasma sintering（ SPS） were investigated in SBF simulated body fluid. It was compared with those of as-SPSed micron size grain Ti-8Mo-3Fe alloy and as-casted Ti and TC4 alloy. The results show that ultrafine grain Ti-8Mo-3Fe alloy with high density and uniform microstructure can be fabricated by MA-SPS,and the alloy mainly consists of β-Ti phase and a small amount of α-Ti phase. The average grain size is 1. 5 μm,and the microhardness is 448 HV. In the same wear condition,the wear degree of ultrafine grain Ti-8Mo-3Fe alloy is significantly lower than those of micro-crystalline Ti-8Mo-3Fe,as-casted Ti,and TC4 alloy,so it has the lowest wear volume and stable friction coefficient. Ultrafine grain Ti-8Mo-3Fe alloy is mainly characterized by abrasive wear,but micro-crystalline Ti-8Mo-3Fe,as-casted Ti and TC4 alloy are characterized by abrasive and adhesion wear.