Abstract
By studying the beneficial effect of yttrium for high-temperature cyclic oxidation resistance of Fe-Ni-Cr-Al alloys, the mechanisms responsible for alumina scale-substrate adherence are approached, discussed and pointed out in this particular case. The principal mechanisms proposed by various authors are examined, taking into account results and observations obtained by oxidizing these alloys. Some of the assumptions usually put forward, particularly that of mechanical keying of the oxide scale by yttria particles, are excluded in this case, while others, such as the influence of yttrium on the oxide stresses, seem to be preponderant. Indeed, various experiments show that yttrium additions improve oxide scale ahderence by increasing alumina plasticity. This effect is related to the influence of yttrium on the cationic mobility in alumina.
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