钛合金与钴铬钼切向微动磨损行为研究

本文中以Ti6Al4V与CoCrMo合金为研究对象，在不同介质中开展了球/面切向微动磨损的试验研究，结合多种微观分析手段，揭示了不同条件下钛合金与钴铬钼间切向微动运行特性和损伤机理.结果表明：钛合金球与钴铬钼平面间的切向微动主要运行于部分滑移区和混合区.随着微动振幅的增加，F_t-D曲线从直线型向椭圆型转变，其中振幅较大时微动末期F_t-D曲线呈平行四边型.在部分滑移区，摩擦系数较小且保持不变，磨痕表面磨损轻微.在混合区，摩擦系数的变化因振幅的不同各存在两种情况.在振幅较小的混合区，磨斑边缘有磨屑堆积，中心以黏着为主.在振幅较大的混合区，磨痕表面以磨粒磨损为主.

Investigation on Tangential Fretting Behavior of Ti Alloys/CoCrMo Couple

The tangential fretting experiments with a Ti6Al4V ball on a CoCrMo plat contact were carried out in different media. Microscopic analysis was used to reveal the fretting running characteristics and damage mechanisms. The results show that tangential fretting mainly run in partial slip regime and mixed regime. With the increase of amplitudes, F_t-D curves transformed from linear into elliptic form. At the end of fretting and large amplitude, F_t-D curves of mixed regime presented parallelogram. In partial regime, the friction coefficient was low and stable, and the mild wear was observed. However, in the mixed regime, two viriation modes of friction coefficient were attributed to the variation of amplitudes. In the smaller amplitude mixed regime, debris accumulation at the edge of the wear scar was observed, and adhesion occurred in the center of wear scar. While in the larger amplitude mixed regime, abrasive wear was the main wear mechanism.