Effect of alumina-formers addition on the isothermal oxidation of TI-AL based intermetallics

Effect of alumina-formers addition on the isothermal oxidation of TI-AL based intermetallics

The main objective of this study is to investigate the effect of adding the alumina former elements on the isothermal oxidation behavior of Ti-Al based intermetallics. High temperature oxidation test was carried out on Ti-Al based intermetallics namely the Ti-48Al-0.5Ag, Ti-48Al-2Cr-1.5Ag and Ti-48A...

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Main Author: Tan, Ming Jiun
Format: Thesis
Language:English
Published: 2008
Subjects:
TJ Mechanical engineering and machinery
Online Access:http://eprints.utm.my/id/eprint/9691/1/TanMingJiunMFKM2008.pdf
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id my-utm-ep.9691
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institution Universiti Teknologi Malaysia
collection UTM Institutional Repository
language English
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Tan, Ming Jiun
Effect of alumina-formers addition on the isothermal oxidation of TI-AL based intermetallics
description The main objective of this study is to investigate the effect of adding the alumina former elements on the isothermal oxidation behavior of Ti-Al based intermetallics. High temperature oxidation test was carried out on Ti-Al based intermetallics namely the Ti-48Al-0.5Ag, Ti-48Al-2Cr-1.5Ag and Ti-48Al-2Cr- 1.5Ag-0.5W oxidized isothermally at 900°C. The kinetic rates of oxidation for the intermetallics were near to parabolic and the addition of Chromium (Cr) increased the kinetic rate of oxidation. Examination on the surfaces of oxide scales by using the Field Emission Scanning Electron Microscopy (FESEM), Atomic Force Microscopy (AFM) and the X-ray Diffraction (XRD), revealed that the phases formed on the scale surfaces were dependent on the composition of the base alloy and the kinetic rates of oxidation. Analysis of the scale cross section found that the adherence of the scale to the base alloy improved by the addition of the alumina former elements. Based on the Energy Dispersive X-ray (EDX) spot and line scan analysis performed on the cross sectional of the scale, all the intermetallics showed an Al-depleted zone and the formation of aluminum oxide in the scale even at the early stage of the scale development. This indicated that the outward diffusion of aluminum to form Al2O3 is promoted by the addition of alumina former elements. Microhardness-indentation results revealed that the hardness values were different across the cross section of the scale. The hardness was the highest in the scale due to the presence of high TiO2 content.
format Thesis
qualification_level Master's degree
author Tan, Ming Jiun
author_facet Tan, Ming Jiun
author_sort Tan, Ming Jiun
title Effect of alumina-formers addition on the isothermal oxidation of TI-AL based intermetallics
title_short Effect of alumina-formers addition on the isothermal oxidation of TI-AL based intermetallics
title_full Effect of alumina-formers addition on the isothermal oxidation of TI-AL based intermetallics
title_fullStr Effect of alumina-formers addition on the isothermal oxidation of TI-AL based intermetallics
title_full_unstemmed Effect of alumina-formers addition on the isothermal oxidation of TI-AL based intermetallics
title_sort effect of alumina-formers addition on the isothermal oxidation of ti-al based intermetallics
granting_institution Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department Faculty of Mechanical Engineering
publishDate 2008
url http://eprints.utm.my/id/eprint/9691/1/TanMingJiunMFKM2008.pdf
_version_ 1747814778393329664
spelling my-utm-ep.96912018-06-29T21:51:13Z Effect of alumina-formers addition on the isothermal oxidation of TI-AL based intermetallics 2008-12 Tan, Ming Jiun TJ Mechanical engineering and machinery The main objective of this study is to investigate the effect of adding the alumina former elements on the isothermal oxidation behavior of Ti-Al based intermetallics. High temperature oxidation test was carried out on Ti-Al based intermetallics namely the Ti-48Al-0.5Ag, Ti-48Al-2Cr-1.5Ag and Ti-48Al-2Cr- 1.5Ag-0.5W oxidized isothermally at 900°C. The kinetic rates of oxidation for the intermetallics were near to parabolic and the addition of Chromium (Cr) increased the kinetic rate of oxidation. Examination on the surfaces of oxide scales by using the Field Emission Scanning Electron Microscopy (FESEM), Atomic Force Microscopy (AFM) and the X-ray Diffraction (XRD), revealed that the phases formed on the scale surfaces were dependent on the composition of the base alloy and the kinetic rates of oxidation. Analysis of the scale cross section found that the adherence of the scale to the base alloy improved by the addition of the alumina former elements. Based on the Energy Dispersive X-ray (EDX) spot and line scan analysis performed on the cross sectional of the scale, all the intermetallics showed an Al-depleted zone and the formation of aluminum oxide in the scale even at the early stage of the scale development. This indicated that the outward diffusion of aluminum to form Al2O3 is promoted by the addition of alumina former elements. Microhardness-indentation results revealed that the hardness values were different across the cross section of the scale. The hardness was the highest in the scale due to the presence of high TiO2 content. 2008-12 Thesis http://eprints.utm.my/id/eprint/9691/ http://eprints.utm.my/id/eprint/9691/1/TanMingJiunMFKM2008.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering Liu, Zhenyu and Narita, Toshio (2004). Oxidation Behavior od TiAl (Cr, Ag) at 900°C in Water Vapor, Intermetallics 12 (2004) 459- 468. Zheng, Kai, Gao, Wei and Liang, Jing (2004). Molten Salt Vapour Corrosion of Ti- Al- Ag intermetallics, Intermetallics 12 (2004) 539- 544. Liu, Zhenyu and Narita, Toshio (2004). The Effect of Water Vapor on the Oxidation Behavior of ?- TiAl-Ag coatings at 1073K in air, Intermetallics 11 (2003) 795- 805. Gerling, R., Schimansky, F.P., Stark, A., Bartels, A., Kestler, H., Cha, L.,Scheu, C. and Clemens, H. (2008), Microstructure and Mechanical Properties of Ti 45Al 5Nb + (0-0.5C) Sheets, Intermetallics xx (2008) 1-9. Li, X.Y. and Taniguchi, S. (2005). Oxidation Behavior of a ?- TiAl- based Alloy implanted by Silicon and/ or Carbon, Materials Science and Engineering A398 (2005) 268- 274. Schumacher, G., Dettedwanger, F., Schutze, M., Hornauer, U., Richter, E., Wieser, E. and Moller, E. (1999), Microalloying Effects in the Oxidation of TiAl Materials, Intermetallics 7 (1999) 1113-1120. Kofstad, P. (1988). High Temperature Corrosion, Elsevier Applied Science Publisher Ltd., New York, 1988. Jones, Denny A. (1996). Principles and Prevention of Corrosion, Prentice Hall, Upper Saddle River, NJ 07458. Birks, N. and Meier, G.H. (1983). Introduction to High Temperature Oxidation of Metals, Edwards Arnold Ltd., London. Fontana, Mars G. (1987). Corrosion Engineering, McGraw-Hill, Inc. Sauthoff, Gerhard (1995). Intermetallics, Weiheim; New York; Basel; Cambridge; Tokyo: VCH, 1995. Khana, A.S. (2004). Introduction to High Temperature Oxidation and Corrosion, ASM International. Huang, S.C. and Chesnutt, J.C. (1995). Gamma TiAl and its Alloys, John Wiley & Sons Ltd. Astuty Amrin (2004). High-Temperature Oxidation of Titanium Aluminides, Ph.D. Thesis,Universiti Teknologi Malaysia, Skudai. Nurfhashahidayu binti Mohd Badri (2006). Cyclic Oxidation of Ti-Al Based Intermetallic in Laboratory Air, Bachelor Degree Thesis, Universiti Teknologi Malaysia, Skudai. Stoloff, N.S. and Sikka, V.K. (1996). Physical Metallurgy and Processing of Intermetallic Compounds, Chapman & Hall. Kekare, S.A. and Aswath, P.B. (1997). Oxidation of TiAl Based Intermetallics, Chapman & Hall. Wu, Y., Umakoshi, Y., Li, X.W. and Narita, T. (2006). Isothermal Oxidation Behavior of Ti-50Al Alloy with Y Additions at 800 and 900°C, Springer Science and Business Media, LLC. Jiang, Zh.G., Chen, B., Liu, K. and Li, Y.Y. (2006), Effects of Boron on phase transformation of high Nb containing TiAl-based alloy, Elsivier Intermetallics 15 (2007) 738-743. Thirumahran A/L Selvaraja (2006). A Study of Scales Development on High Temperature Isothermal Oxidation of Titanium Aluminide in Flowing Dry Air, Bachelor Degree Thesis, Universiti Teknologi Malaysia, Skudai.

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