Tribological behaviour of double-glow plasma zirconium-yttrium alloying on γ-TiAl

Abstract

A Zr-Y alloyed layer was prepared onto the surface of γ-TiAl using double-glow plasma surface alloying technique (DG technique). The results showed that the Zr-Y alloyed layer was comprised of deposited sub-layer and diffused sub-layer, with a total layer thickness of about 20 μm. The nano-indentation test result showed that the nano-hardness of Zr-Y alloyed layer was 2.35 times that of γ-TiAl. The scratch test was carried to evaluate the adhesion strength of Zr-Y alloyed layer. The tribological behaviours were investigated both at ambient temperature and 500°C. Under dry sliding condition, the friction coefficient of the Zr-Y alloyed layer was lower than that of the γ-TiAl. The specific wear rate of γ-TiAl in the presence of Zr-Y alloyed layer was approximately one fifth that in the absence of the alloyed layer. The excellent wear resistance of Zr-Y alloyed layer could be attributed to the high hardness or load-carrying ability.

Influence of Mo content on properties of Ti–Al–Mo–N films

“…The wear resistance of the films is affected by the hardness, the formation of TiO 2 , Al 2 O 3 and the solid-lubricating phase MoO 3 also have an effect on the WR: higher hardness contributes to the better wear resistance as indicated in Ref. [30,31]. When the Mo content is 8.2 at.-%, the hard particles of TiO 2 and Al 2 O 3 result in abrasive wear, and MoO 3 has a layered structure, it is easy to be worn off layer by layer, leads to the increase of WR.…”