Influence of surface finish and annealing treatment on oxidation behavior of Ti-48Al-8Cr-2Ag alloy |
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Authors: | Yan-jun Xi and Yong-jun Liu |
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Affiliation: | (1) School of Materials and Chemical Engineering, Zhongyuan University of Technology, Zhengzhou, 450007, China |
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Abstract: | The effect of surface finish and annealing treatment on the oxidation behavior of Ti-48Al-8Cr-2Ag (molar fraction, %) alloy
was investigated at 900 and 1 000 °C, respectively in air. Thermal gravimetric analysis (TGA) was conducted for the characterization
of oxidation kinetics. The microstructures of oxide scales were studied by scanning electron microscopy (SEM) and transmission
election microscopy (TEM) techniques. Unfavorable effect of the annealing treatment on the oxidation behavior of the coating
was also investigated. The results indicate that the oxidation behavior of the alloy is influenced by surface finish and annealing
treatment. The oxidation rate of ground sample is lower than that of the polished alloy at 1 000 °C in air. The former forms
a scale of merely Al2O3, and the latter forms a scale of the mixture of Al2O3 and TiO2. Annealing can improve the formation of TiO2.
Foundation item: Project(2007430028) supported by the Science and Technique Foundation of Henan Educational Committee, China |
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Keywords: | Ti-48Al-8Cr-2Ag alloy coating surface finish annealing oxidation behavior |
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