Abstract
The oxidation behavior of a number of ternary and quaternary γ-TiAl alloys in air has been studied under rapid thermal cycling conditions for periods of hundreds of hours in the temperature range 850–1000°C. The ability of the γ-TiAl alloys to form a protective alumina scale on oxidation was found to be much influenced by the presence of low concentrations of other elements, binary combinations of which were often more effective in promoting oxidation-resistance than single element additions. For example, whereas the alloys Ti48Al4Cr and Ti48Al4Ta formed spalling unprotective TiO 2Al 2O 3 scales at 850°C. Ti48Al4Nb, Ti48Al4W and the quaternary alloys Ti48Al2Cr2Nb and Ti48Al2Mn2W formed protective Al 2O 3 scales. The alumina-forming alloys Ti48Al16Cr, Ti48Al12Nb and Ti48Al2Cr6Ta were very oxidation-resistant even at 900°C.
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