Relative effects of chromium and niobium on microstructure and mechanical properties as a function of oxygen content in TiAl alloys

The effects of 2 at.% chromium and niobium on microstructure and mechanical properties of Ti–48Al–x(Cr, Nb) have been investigated for alloys with different oxygen content, ranging from ultra-high purity to doped alloys. Chromium and niobium additions have significant effects for the high purity alloys, whereas for alloys containing oxygen, no significant modification is observed due to the strong stabilizing effect of oxygen on the lamellar microstructure.