Oxidation behaviour of an ODS NiAl-based intermetallic alloy

被引：35

作者：

González-Carrasco, JL ^{[1
]}

Pérez, P ^{[1
]}

Adeva, P ^{[1
]}

Chao, J ^{[1
]}

机构：

[1] CSIC, CENIM, Ctr Nacl Invest Met, Dept Met Phys, Madrid 28040, Spain

来源：

INTERMETALLICS | 1999年 / 7卷 / 01期

关键词：

nickel aluminides; based on NiAl; oxidation;

D O I：

10.1016/S0966-9795(98)00012-0

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The oxidation behaviour of an oxide dispersion-strengthened (ODS) NiAl intermetallic, microalloyed with Ti and Mo and strengthened by a fine dispersion of Y2O3, is investigated in the temperature range of 90-1200 degrees C for up to 200 h exposure. The results have shown that a nearly pure alumina scale is formed irrespective of the exposure time, which is consistent with previous results on oxidation of NiAl or doped NiAl alloys. From the analysis of the kinetics results and the surface scale morphology it follows that below 1100 degrees C metastable alumina control the oxidation kinetics, even after long exposure times. The presence of yttria seems to account for this increase in the transient oxidation period. Preoxidation of the alloy (1200 degrees C/3 h) leads to a substantial reduction of the oxidation rate and precludes void formation at the scale/gas interface. Furthermore, formation of uniform scale, which would diminish the probability of failure of the scale due to thermal stresses, is favoured. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：69 / 78

页数：10

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