材料期刊网

为改善Ti6A14V表面喷丸强化层的生物摩擦学性能,把不同参数Fe+注入到直径4 mm喷丸的强化层中.用Nano IndenterⅡ型纳米显微力学探针测定试样改性层的纳米硬度,在MRTR多功能摩擦磨损试验机上以ZrO2球/改性层为摩擦副进行人工唾液和透明质酸钠溶液润滑下的生物摩擦学试验,使用S-3000N扫描电子显微镜分析改性层组织形貌和生物摩擦学试验后的磨痕形貌.结果表明:Fe+注入Ti6A14V表面喷丸强化层的形成相为Fe2Ti.随着注入能量和剂量增加,Fe2Ti含量从3.7％增至4.7％;Fe+注入改性层的纳米硬度从8.46 GPa增至10.29 GPa,都远高于单一喷丸强化层的5.59 GPa;在人工唾液和透明质酸钠溶液润滑下的摩擦因数分别从0.53降至0.38和从0.49降至0.28,都低于单一喷丸强化层的0.62和0.59,磨损呈现不同程度的减轻.Fe+注入能显著提高Ti6AI4V表面单一喷丸强化层的减摩抗磨性能.

Fe+ with different energies and doses were implanted into shot-peened layers (the diameter of shot peen was 4 mm) on Ti6Al4V to improve the bio-tribological properties.The nano-hardness of modified layers was measured by Nano Indenter Ⅱ and bio-tribological tests were performed on MRTR multifunctional machine with artificial saliva and sodium hyaluronate as lubricants.The friction pairs used in the bio-tribological test were ZrO2 ball/modified layers on Ti6A14V.S-3000N SEM was used to observe the surface microstructures and grinding cracks.The results demonstrated that the formed phases in the shot-peened layers on Ti6A14V by Fe+ implantation were Fe2Ti.With the increase of ion energies and doses,the content of Fe2Ti increased from 3.7 ％ to 4.7 ％;the nano-hardness of modified layers on Ti6A14V by Fe+ implantation increased from 8.46 GPa to 10.29 GPa,which were much higher than the ones with value 5.59 GPa of the single shot-peened layer;the friction coefficient of modified layers with Fe+ implantation decreased from O.53 to O.38 and from O.49 to O.28 under artificial saliva and sodium hyaluronate,which were lower than ones with value 0.62 and 0.59 of the single shot-peened layer,respectively,and the wear loss of Fe+ implantation layers reduced to varying degrees.We can inferred that Fe+ implantation obviously improves friction and wear resistance of the single shot-peened layer on Ti6A14V surface.