Friction and wear properties of TiAl and Ti₂AlN/TiAl composites at high temperature

Abstract

The high-temperature friction and wear properties of TiAl alloys and Ti₂AlN/TiAl composites (TTC) in contact with nickel-based superalloy were studied. The results showed that, at 800 and 1 000 °C, the coefficient of the friction (COF) decreased with the increase of sliding velocity and the wear loss of the TTC decreased with the increase of volume fraction of Ti₂AlN. The wear mechanisms of the pairs are adhesive wear and the wear debris mainly comes from the contacting nickel-based superalloy. The intergranular fracture and the cracking of the phase boundary in the lamellar structure are the wear mode of TiAl alloy. The wear mode of TTC is phase boundary fracture and adhesive spalling. The abrasive resistance of TTC is slightly higher than that of TiAl alloy.

Keywords

TiAl alloy / Ti₂AlN/TiAl composites / friction and wear at high-temperaturer

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