Oxidation Behavior of Aluminide Coated Ti-Al-Cr-Nb-Zr-Y Alloys at High Temperatures

Eddy Basuki; Djoko Prajitno; Pawawoi Pawawoi

doi:10.4028/www.scientific.net/SSP.227.345

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Oxidation Behavior of Aluminide Coated Ti-Al-Cr-Nb-Zr-Y Alloys at High Temperatures

Abstract:

In this study the oxidation behavior of diffusion aluminide coating containing layers of TiAl₃ and TiAl₂, develop on a substrate of Zr-Y doped α₂-Ti₃Al/γ-TiAlCrNb intermetallic alloy using pack aluminizing method, was investigated isothermally at 800°C, 900°C, and 1000°C under atmospheric air pressure. The pack cementation was carried out at 850°C for 25 hours in a pack containing 20%-wt Al, 2%-wt NH₄Cl, and 78%-wt Al₂O₃.The phases in the coatings and oxide layers were examined by optical and scanning electron microscopy as well as X-ray diffraction method, while chemical composition of the oxides and phases were examined with EDS attached on the SEM. The experimental results showed that the addition of Zr and Y increases the oxidation resistance of the coating by formation of complex oxides mainly of Al₂O₃ at the coating surfaces and sub-surface. Combination of oxidation and interdiffusion process cause transformation of TiAl₃ layer to TiAl₂ that decrease the oxidation resistance through the formation of TiO₂ rod crystals on the junction between TiAl₂ and Al₂O₃ in the outer layer.

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Periodical:

Solid State Phenomena (Volume 227)

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345-348

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.227.345

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Online since:

January 2015

Authors:

Eddy Basuki*, Djoko Prajitno, Pawawoi Pawawoi

Keywords:

Aluminide Coatings, High Temperature Oxidation, Intermetallic, Pack Aluminizing, TiAl Alloys

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References

[1] J.C. Beddoes, W. Wallace, M.C. de Malherbe, The Technology of Titanium Aluminides for Aerospace Application, Mater. Manufact. Process. 7 (1992) 527-559.

DOI: 10.1080/10426919208947440

Google Scholar

[2] F. Appel, R. Wagner, Mater. Sci. Eng. 22R (1998) 187-268.

Google Scholar

[3] Pawaoi, E.A. Basuki, Effect of Cr Addition on the Oxidation Behavior of Ti-Al-Cr Alloys at High Temperatures, Proceedings of The 3rd Indonesian Process Metallurgy Conference (IPM III), December 4th -5th , 2012, Bandung.

Google Scholar

[4] N. Yamaguchi, T. Kakeyama, T. Yoshioka, O. Ohashi, The Effect of the Third Elements on High Temperature Oxidation Resistance of TiAl3 Intermetallic Compounds, Mater. Trans. 43(12) (2002) 3211-3216.

DOI: 10.2320/matertrans.43.3211

Google Scholar

[5] M.P. Brady, W.J. Brindley, J.L. Smialek, J.E. Locci, JOM 48(11) (1996) 46-50.

Google Scholar

[6] F.C. Campbell, Light Weight Materials-Understanding the Basics, ASM International, Chapter 6, (2012).

Google Scholar