J. Jedlinski et al., THE EFFECT OF IMPLANTED YTTRIUM ON THE OXIDATION BEHAVIOR OF FE-20CR-5AL ALLOY AT 1373-K IN AIR, Journal de physique. IV, 3(C9), 1993, pp. 591-597
The influence of implanted yttrium on the oxidation behaviour of an Fe
-20Cr-5Al alloy was studied at 1373 K in air under isothermal and ther
mal cycling conditions in order to verify previous results obtained at
1473 K which indicated no beneficial effect of this addition. The imp
lanted yttrium substantially improved the scale resistance to spalling
, only slightly affected the scale growth rate, and altered the scale
morphology. On unimplanted material developed ridged scales, while ytt
rium promoted the formation of buckled oxide layers, the higher the do
se the more buckled the scale. After spalling of the scale from yttriu
m implanted material due to prolonged thermal cycling ridges were grow
ing instead of buckles. These and previous results showed that the eff
iciency of the implanted yttrium depends on its amount in the substrat
e and on the reaction temperature as well and that there is no simple
correlation between the scale thickness and its resistance to spalling
.