Abstract
Coupon specimens of 30Nb-40Al-(30-x)Cr-xMo (mol %), with x being 0, 7.5, 15,
22.5 or 30, and of 30Nb-40Al-(22.5-y)Cr-7.5Mo-ySi, with y being 5 or 10, were oxidised in
air in a temperature range 1473 to 1773 K for 72 ks. The influence of additions of 0.05 and
0.1% Hf to 30Nb-40Al-22.5Cr-7.5Mo was also examined. Conventional metallographic
examinations were performed for the specimens before and after the oxidation. The major
phase of the specimens is AlNbCr, and their minor phases are Cr2Al and NbAl3, except for
high Mo-content specimens which form AlNbMo, Nb2Al, Mo3Al and MoAl3. The additions of
Si lead to additional formation of Nb5Si3. Virtually Al2O3 scales (a dense and continuous
Al2O3 layer with a thin layer consisting of AlNbO4, CrNbO4 and/or SiO2 on it) are formed at
temperatures up to 1673 K, except for the high Mo-content specimens which form poorly
protective scales. The additions of Hf increase the mass gain to some degree. 5Si forms
protective scales at temperatures up to 1723 K, and 30Cr and 10Si up to 1773 K.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
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