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.

Ti6Al4V合金-CoCrMo合金对通常应用于人工髋关节的模块化头颈接口。不幸的是，该界面处的微动腐蚀损伤严重限制了其使用寿命。这项工作研究了 Ti6Al4V-CoCrMo 对在小牛血清溶液中的微动腐蚀。我们建立了该材料对关于载荷和位移的运行条件微动图（RCFM），并揭示了该材料对在不同微动状态下的损伤机制，即部分滑移状态（PSR）、混合微动状态（MFR）和总滑移状态（GSR）。 Ti6Al4V合金的损伤机制主要是CoCrMo合金引起的磨粒磨损和摩擦腐蚀。 MFR 中也存在粘着磨损（材料转移）。 CoCrMo合金的损伤机制主要是GSR和MFR中金属氧化物引起的磨料磨损和摩擦腐蚀，而PSR中没有明显损伤。此外，GSR的中间接触区域形成了致密的高硬度复合材料层，减少了Ti合金的腐蚀和磨损，加剧了Co合金的损坏。最后，构建了 Ti 和 Co 离子的离子浓度图，显示了不同位移和载荷下释放的 Ti 和 Co 离子量的变化。