Influence de l'aluminium sur la tenue à l'oxydation du titane entre 550 et 750 °C

Abstract

The oxidation behaviour of TiAl binary alloys (1.65 wt.% Al and 10 wt.% Al) was studied between 550 and 750 °C in pure oxygen for times up to 500 h. From thermogravimetric studies it appears that these alloys have a better oxidation resistance than that of pure titanium. The morphological observations showed a marked influence of aluminium on the oxide scale structure and crystallization. However, the X-ray diffraction experiments revealed only the presence of rutile and α alumina, the latter being essentially localized close to the outer interface. The influence of aluminium on the oxidation behaviour of these alloys is discussed in comparison with published data and the observations made for pure titanium.