Microstructural study of the theta-alpha transformation in alumina scales formed on nickel-aluminides

被引：258

作者：

Tolpygo, VK ^{[1
]}

Clarke, DR ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Coll Engn, Dept Mat, Santa Barbara, CA 93106 USA

来源：

MATERIALS AT HIGH TEMPERATURES | 2000年 / 17卷 / 01期

关键词：

alumina; nickel aluminide; luminescence spectroscopy; phase transformation; scanning electron microscopy;

D O I：

10.1179/mht.2000.011

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Luminescence spectroscopy and scanning electron microscopy have been used to study the transformation from theta-Al2O3 to alpha-Al2O3 on the surface of platinum-modified nickel aluminide, (Ni,Pt)Al, bond coats on superalloys during initial stages of oxidation at 1,000-1,200 degrees C. The transformation can proceed in a number of ways, depending on the surface roughness, leading to different microstructures of the stable alpha-alumina scale. The use of the luminescence method makes it possible to correlate microstructural features of the oxide with the local stress through piezospectroscopic shifts of both alpha- and theta-alumina optical spectra.

引用

页码：59 / 70

页数：12

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