Isothermal Corrosion Behaviors of TiAl–Nb Alloys in Liquid Zn-55Al-1.6Si (wt.%)

Peng Fei Sun; Xiao Ou Jin; Yi Fan Hu; Jun Pin Lin

doi:10.4028/www.scientific.net/MSF.747-748.69

Paper Titles

Effect of Al on Microstructures and Properties of Ti-45Al-8.5Nb-0.2B-0.2W Alloy
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Numerical Analysis of Superplastic Bulging Process of TiAl Sheet
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Effect of Nb Addition on the Corrosion Behavior of Porous TiAl Based Alloys in Aqueous Environments
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Intrinsic Brittlement of Mo₃Si by First-Principle Calculations
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Isothermal Corrosion Behaviors of TiAl–Nb Alloys in Liquid Zn-55Al-1.6Si (wt.%)
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Laser Remelting Effect on the Joint Property of Diffusion Bonding of TiAl Intermetallics and TC4 Alloy
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The Influence of Niobium on the Interdiffusion Coefficients in α₂and γ of TiAl Alloys
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Effects of Scandium on Corrosion Resistance and Mechanical Properties of Cellular Al-Based Foams
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Preparation of TiAl Intermetallic Alloy by Gelcasting
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HomeMaterials Science ForumMaterials Science Forum Vols. 747-748Isothermal Corrosion Behaviors of TiAl–Nb Alloys...

Isothermal Corrosion Behaviors of TiAl–Nb Alloys in Liquid Zn-55Al-1.6Si (wt.%)

Abstract:

The isothermal static corrosion of Ti-45Al-8Nb and Ti-53Al-20Nb (at.%) in liquid Zn-55Al-1.6Si (wt.%) at 630°C was studied. Incubation periods without any corrosion occurred are exhibited in both alloys. After the incubation time, the corrosion rate increases noticeably which is controlled by the reaction-diffusion and dissolution mechanism. Thick transition layers were formed. The EDS results show that Si and Al diffused into the TiAl-Nb alloys preferentially, while Zn was hindered from diffusing and segregated in spots. All the transition layers are porous and composed mainly of Al₃Ti (Nb), SiTi and AlNbZn₂. The fracture of the transition layers of Ti-45Al-8Nb should be attributed to the defects of the lamellar colony boundaries. nanoIndenter was used to check the mechanical properties of the materials. The results show that the transition layers have higher micro-hardness and elastic modulus than the matrix.

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Periodical:

Materials Science Forum (Volumes 747-748)

Pages:

69-76

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.747-748.69

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Online since:

February 2013

Authors:

Peng Fei Sun, Xiao Ou Jin, Yi Fan Hu, Jun Pin Lin

Keywords:

Corrosion, Diffusion, Galvalume, TiAl-Nb Intermetallic Compound

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