Metastable-Stable Phase Transformation Behavior of Al2O3 Scale Formed on Fe–Ni–Al Alloys
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- 作者：Shigenari Hayashi ; Yuto Takada ; Suzue Yoneda ; Shigeharu Ukai
- 刊名：Oxidation of Metals
- 出版年：2016
- 出版时间：August 2016
- 年：2016
- 卷：86
- 期：1-2
- 页码：151-164
- 全文大小：2,067 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Inorganic Chemistry
Tribology, Corrosion and Coatings
Metallic Materials - 出版者：Springer Netherlands
- ISSN：1573-4889
- 卷排序：86
文摘
The oxidation behavior of Ni–Fe–41.5at.%Al alloys with different Fe/Ni ratios was investigated in air at 1000 °C in order to clarify the effect of Fe on the phase transformation of Al2O3 scale, using in-situ high-temperature X-ray diffraction by means of synchrotron radiation. The oxidation mass gain of alloys after 25 h of oxidation generally decreased with increasing Fe content; however, the initial oxidation mass gain was significantly decreased by increasing alloy Fe content. In-situ X-ray diffraction analysis indicated that higher alloy Fe contents promoted rapid formation of the stable α-Al2O3, while lower Fe in the alloy maintained the metastable Al2O3 for longer time oxidation. The effect of Fe on promoting α-Al2O3 formation can be explained by the initial formation of α-Fe2O3, whose structure is isomorphous with α-Al2O3. The additional effect of Fe on the growth rate of α-Al2O3 is also discussed.KeywordsPhase transformation of Al2O3Fe effectSynchrotronIn-situ XRD