PROTECTIVE AL2O3 SCALE FORMATION ON NBAL3-BASE ALLOYS

被引：42

作者：

DOYCHAK, J ^{[1
]}

HEBSUR, MG ^{[1
]}

机构：

[1] SVERDRUP TECHNOL INC,NASA,LEWIS RES CTR GRP,BROOK PK,OH 44142

来源：

OXIDATION OF METALS | 1991年 / 36卷 / 1-2期

关键词：

OXIDATION; ALUMINIDE INTERMETALLICS; NIOBIUM ALUMINUM CHROMIUM ALLOYS; REACTIVE ELEMENT EFFECT; ALUMINUM OXIDE SCALES;

D O I：

10.1007/BF00938458

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The oxidation of NbA13 with additions of Cr and Y was studied to determine the mechanisms of the beneficial effects of these elements upon oxidation. Cr additions to the binary NbA13 alloy of up to 6.8 at. % reduced the scale growth rates and promoted alpha-Al2O3 formation over much longer times relative to binary NbAl3. A major effect of Cr is to form a layer of AlNbCr at the metal/scale interface, which is inherently more oxidation-resistant than the matrix alloy in the long term. Yttrium additions to a Cr-containing alloy improved the scale growth rate and adherence, and changed the scale microstructure to mimic that of a typical protective Al2O3 scale.

引用

页码：113 / 141

页数：29

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