Influence of Aluminum and Rhenium on the Isothermal Oxidation Behavior of CoNiCrAlY Alloys
| Autor: | H. Lan, Cunlong Zhang, Y.-D. Zhang, Z.G. Yang, Peggy Y. Hou |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
Diffusion Alloy Spinel Metallurgy technology industry and agriculture Metals and Alloys Oxide chemistry.chemical_element engineering.material Rhenium equipment and supplies Isothermal process Corrosion Inorganic Chemistry chemistry.chemical_compound chemistry Aluminium Materials Chemistry engineering |
| Zdroj: | Oxidation of Metals. 75:77-92 |
| ISSN: | 1573-4889 0030-770X |
| DOI: | 10.1007/s11085-010-9221-7 |
| Popis: | The oxidation behavior of a Co32Ni21Cr8Al0.6Y (wt%) alloy with and without the addition of 3.5 wt% rhenium, 2 wt% aluminum or a combination of the two was investigated at 1000 °C. Results showed that increasing the Al content from 8 to 10 wt% led to an increase of the alloy β-phase, but did not affect the oxidation behavior. Re addition induced (Cr,Re,Y)-rich phase to precipitate in the alloy, accelerated the θ- to α-alumina transformation, reduced the oxidation rate and enhanced the rate of alloy Al diffusion. Adding both Al and Re further improved the oxidation behavior by promoting the development of the external alumina scale and suppressing the formation of Ni, Co containing spinel. This alloy also showed the largest reduction of oxidation rate and emerged to be the most beneficial. A continuous Cr–Re rich layer was observed at the oxide/alloy interface of the Re, Al containing alloy after longer oxidation times, but this layer is not expected to affect the continued growth of the alumina scale. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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