中文摘要：

利用双辉等离子渗金属技术，对Ti6Al4V合金进行等离子渗Zr处理，在其表面形成渗Zr合金层来改善钛合金的耐磨性能。用SEM、EDS及显微硬度计研究了渗Zr合金层的组织形貌、成分分布及硬度变化：对渗Zr处理及未处理的Ti6Al4V基材进行了往复球～盘摩擦磨损试验，用SEM、EDS及轮廓仪对比分析了Ti6Al4v渗Zr前后在不同载荷下的摩擦学性能。结果表明：在Ti6Al4V表面形成的Zr合金层厚度约40μm，组织均匀致密；渗Zr后的表面硬度比未处理的提高了200HV。渗zr后的Ti6Al4V在2N和5N载荷下的平均摩擦系数分别为0.25和0．15，比未处理基材的摩擦系数减少了0．2和0．1，比磨损率分别是Ti6Al4V基材的48％和56％，说明钛合金渗Zr后其减摩和耐磨性能均得到改善。Zr的固溶强化作用是Ti6Al4V渗Zr后耐磨性得以改善的主要原因。

英文摘要：

In order to improve its tribological property, Zr-alloyed layer was prepared on Ti6Al4V surface using double glow plasma alloying technique. Microstructure, concentration distribution and hardness of the Zr-alloyed layer were analyzed using SEM, EDS and microhardness tester. Zr-alloyed and untreated Ti6Al4V were tested by ball-disc reciprocating wear tester, and their tribological property under different loads were analyzed using SEM, EDS and profile meter. The results show that the Zr-alloyed layer forrnes on Ti6Al4V substrate, 40 μm in thickness, exhibits a compact microstructure and diffusion bonding with substrate. Average values of fiiction coefficients ofZr-alloyed Ti6Al4V under loads of 2 N and 5 N are 0.25 and 0.15 respectively, a decrease of 0.2 and 0.1 in comparison with untreated Ti6Al4V, but the wear rates after Zr alloying are respectively 48% and 56% of untreated Ti6Al4V, showing an improved combination of antifriction and wear resistance. Solid solution strengthening of Zr in Ti6Al4V after plasma Zr alloying is the main reason of the improved tribological property.