Journal of the Japan Institute of Metals and Materials
Online ISSN : 1880-6880
Print ISSN : 0021-4876
ISSN-L : 0021-4876
The Effects of Small Amounts of Aluminum on the High Temperature Oxidation of 80Ni-20Cr Alloy
Atsushi TakeiHiroko Takaishi
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1969 Volume 33 Issue 8 Pages 922-927

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Abstract

For the purpose of studying the effects of additions of small amounts of elements on high temperature oxidation of 80Ni-20Cr alloy, the oxidation behaviors of four kinds of alloy containing 1, 0.1 and 0.01%Al and without Al were studied, following the previous report on the effects of small amounts of Be.
The oxidation tests were carried out mainly by the repeated heating method over the temperature range from 900°C to 1200°C in the atomosphere. The oxidation products on these alloys were observed by means of metallography, X-ray diffraction, electron diffraction and electron probe microanalysis.
From these experimental results, it was found that the addition of 1%Al is effective to the prevention of high temperature oxidation, because it decreases the oxidation rate and prevents the spalling of the protective oxide layer during the heating and cooling cycle, although it was not better than the case of 0.1%Be. The oxidation resistance of 0.1 and 0.01%Al alloys were rather inferior to non-Al alloy. After the oxidation tests, the 1%Al alloy forms an oxide layer composed mainly of Cr2O3 and also a subscale that has a component of Al oxide. The present results were similar to the results on 0.1%Be alloy.

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