Tribological Behaviors of Ti6Al4V with Surface Plasma Molybdenized

Abstract:

This paper was directed at improving the wear resistance of titanium alloy Ti6Al4V by double-glow plasma surface alloying (DPSA) technology. A molybdenized layer was successfully formed on Ti6Al4V by the DPSA treatments. The microstructure, composition distribution, phase structure and hardness were analyzed by SEM/EDS, XRD and vickers micro-hardness tester. The molybdenized layer was composed of Mo-deposited layer and Mo-diffusing layer. The average surface micro-hardness of the surface modified layer was 1170.8 HV_0.1, which was much higher than that of the Ti6Al4V substrate. Tribological characterization was carried out by the ball-on-disc tribometer at room temperature and 500°C. The molybdenized layer significantly reduced the wear rate of the Ti6Al4V alloy, which is only about 6.6% and 4.9% of those of the untreated specimens at room temperature and 500°C, respectively. Due to the good self-lubricating effect of Mo elements at high temperature conditions, the friction coefficient and wear rate of the molybdenized layer were both reduced at 500°C, compared to at room temperature.

• Periodical: Materials Science Forum (Volumes 704-705)
• Pages: 1253-1258
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.704-705.1253
• Online since: December 2011
• Authors: Neng Jun Ben, Wen Ping Liang, Bei Lei Ren, Qiang Miao, Ping Ze Zhang
• Keywords: Double-Glow Plasma Surface Alloying Technology, Molybdenizing, Ti-6Al-4V Alloy, Tribological Behavior

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