Oxidation of Al-Co Alloys at High Temperatures

Materials
Patrik ŠulhánekMarián Palcut

Abstract

In this work, the high temperature oxidation behavior of Al71Co29 and Al76Co24 alloys (concentration in at.%) is presented. The alloys were prepared by controlled arc-melting of Co and Al granules in high purity argon. The as-solidified alloys were found to consist of several different phases, including structurally complex m-Al13Co4 and Z-Al3Co phases. The high temperature oxidation behavior of the alloys was studied by simultaneous thermal analysis in flowing synthetic air at 773-1173 K. A protective Al2O3 scale was formed on the sample surface. A parabolic rate law was observed. The rate constants of the alloys have been found between 1.63 × 10-14 and 8.83 × 10-12 g cm-4 s-1. The experimental activation energies of oxidation are 90 and 123 kJ mol-1 for the Al71Co29 and Al76Co24 alloys, respectively. The oxidation mechanism of the Al-Co alloys is discussed and implications towards practical applications of these alloys at high temperatures are provided.

References

Apr 8, 2006·Science·J SatoK Ishida
Sep 1, 1947·The Journal of Physical and Colloid Chemistry·E A GULBRANSEN, W S WYSONG
Aug 31, 2012·Chemical Society Reviews·Jean-Marie Dubois
Jul 26, 2013·Journal of Physics. Condensed Matter : an Institute of Physics Journal·S Alarcón VillasecaE Gaudry
Jun 2, 2014·Science and Technology of Advanced Materials·Julian LedieuVincent Fournée
Mar 4, 2020·ACS Applied Materials & Interfaces·Kanika AnandÉmilie Gaudry

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Citations

Jun 3, 2021·Materials·Sergey VeselkovEvgeny Trofimov

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Methods Mentioned

BETA
scanning electron microscopy
X-ray

Software Mentioned

INCA

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