A. Gil et al., THE INFLUENCE OF IMPLANTED CHROMIUM AND YTTRIUM ON THE OXIDATION BEHAVIOR OF TIAL-BASED INTERMETALLICS, Journal of Materials Science, 30(22), 1995, pp. 5793-5798
The influence of implanted chromium and yttrium on the oxidation behav
iour of Ti-50Al (at %) in air at 800 degrees was investigated. It was
found that implanted chromium and/or yttrium leads to a decrease of th
e oxidation rate because an alumina scale was formed on the implanted
material in the early stages of oxidation, whereas a titania-based sca
le grew on the non-implanted material. With increasing oxidation time
the difference in oxidation behaviour between the implanted and non-im
planted alloy gradually disappeared. These results show that chromium
and yttrium, provided their concentration is properly chosen, can have
a similar positive effect on the oxidation behaviour of TiAl-based in
termetallics as they have on the oxidation behaviour of conventional F
e-, Ni-, or Co-based alumina-forming high temperature alloys.