Wrinkling of α-alumina films grown by thermal oxidation -: I.: Quantitative studies on single crystals of Fe-Cr-Al alloy

被引：133

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：

ACTA MATERIALIA | 1998年 / 46卷 / 14期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S1359-6454(98)00133-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Quantitative measurements of the wrinkling morphology of the alpha-alumina scales formed by thermal oxidation at 1000 degrees C and its evolution with oxidation time have been made using atomic force microscopy. The wrinkling wavelength and amplitude, and from these the surface area of the scale, for (110), (100) and (111) oriented single crystals of Fe-Cr-Al alloy as a function of oxidation time are presented. The residual stress in the scales is determined using piezospectroscopy. Together these results provide the basis for determining the lateral strains associated with the growth of the oxide. Crystallographic orientation of the alloy surface has a pronounced effect on both the wrinkling morphology and stress in the scale during the first 20-30 h of oxidation. The presence of the reactive element, yttrium, suppresses wrinkling and restricts lateral growth but it does not decrease the stress in the oxide. (C) 1998 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：5153 / 5166

页数：14

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