The effect of copper on the cyclic oxidation of Ti-48Al-2Cr-2Nb

One of the challenges in the application of gamma titanium aluminide alloys is the development of suitable joining techniques for fabrication and repair. Transient Liquid Phase (TLP) bonding with a copper-containing composite interlayer has been used successfully to join titanium aluminide alloys. The TLP bonding process introduces a small amount of copper into the alloy. Although the oxidation resistance of titanium aluminide alloys can be strongly affected by alloying additions, the amount of copper present in the TLP bond has been shown to be neutral or beneficial to the isothermal oxidation resistance of the alloy. The results presented in this paper similarly show that a small amount of copper (1 at%) does not significantly affect the cyclic oxidation of Ti-48 at% Al2 at% Cr-2 at% Nb, but that 2 at% Cu is detrimental to the cyclic oxidation resistance.