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Surface alloying with Al, Cr and Si is commonly used to improve its oxidation resistance by promoting the establishment of Al2O3 layer or SiO2 diffusion barrier [291-295]. Micro-plasma oxidation (MPO) in NaAlO2 solution was also used to prepare ceramic coating on Ti-6Al-4V with an attempt to increase its oxidation resistance [296]. The coating was composed of a large amount of Al2TiO5 and a little α-Al2O3 and rutile TiO2. During oxidation decomposition of 20 Zhengwei Li and Wei Gao Al2TiO5 increased the content of α-Al2O3 in the coating.

1. Diffusion Coatings If the content of Al in the alloy or in the near-surface region is high enough, the exclusive formation of an external Al2O3 scale could be expected on TiAl alloys. The simplest but most effective method to increase the Al content is aluminizing. Traditional aluminide coatings produced by pack cementation, electrodeposition or sputtering/inter-diffusion and/or electrospark depsotion processes have been widely applied onto TiAl alloys in order to form a layer of TiAl3 (and/or TiAl2) against oxidation [574-590].

The development of Ti3Al and its alloys has been driven by the need to bridge the gap in temperature capability between conventional near-α Ti alloys and Ni-base superalloys such as INCO 718 or INCO 713. Ti3Al has a specific modulus and stress rupture resistance comparable to that of the superalloys however, the complete absence of room temperature High Temperature Corrosion of Intermetallics 21 plasticity posed the primary challenge in using as a structural material. Additions of alloying elements and sutiable heat treatments can significantly improve its room temperature mechanical properties, and these become to be the key-points for the current development of Ti3Al-base alloys.

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