Segregation at the Al2O3-FeCrAl interface during high-temperature oxidation

被引：32
|
作者：
Tolpygo, VK [1 ]
Viefhaus, H
机构：
[1] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA
[2] Max Planck Inst Eisenforsch GmbH, D-40237 Dusseldorf, Germany
来源：
OXIDATION OF METALS | 1999年 / 52卷 / 1-2期
关键词：
alumina scale; segregation; oxidation; sulfur; oxide-metal interface;
D O I：
10.1023/A:1018818906559
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Impurity segregation at the Al2O3-metal interface of Fe-Cr-Al and Fe-CrAl-Y alloys oxidized at 1100 degrees C was studied using Auger electron spectroscopy (AES). A strong sulfur segregation of the order of a monolayer was found at the contact oxide-metal interface on the yttrium-free alloy, while almost no sulfur was detected at the interface on the yttrium-containing alloy, These results are in agreement with the AES studies of surface segregation on the same alloys during heating at 900 degrees C in ultra-high vacuum. It is suggested that stresses in the alumina scale and underlying metal during oxidation may provide the driving force for impurity segregation at the contact oxide-metal interface.
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页码：1 / 29
页数：29
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