Microstructure and hot corrosion resistance of Si-Al-Y coated TiAl alloy
| Autor: | Fa-qin Xie, Yong-quan Li, Shao-lin Yang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Metallurgy Alloy Metals and Alloys General Engineering 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Corrosion Coating Cementation process 0103 physical sciences engineering Lamellar structure Molten salt 0210 nano-technology Layer (electronics) |
| Zdroj: | Journal of Central South University. 27:2530-2537 |
| ISSN: | 2227-5223 2095-2899 |
| DOI: | 10.1007/s11771-020-4478-8 |
| Popis: | In order to obtain a high-performance surface on TiAl alloy that can meet the requirements in hot corrosion environment, Si-Al-Y coatings were fabricated by pack cementation process at 1050 °C for 4 h. Corrosion behaviors of the TiAl alloy with and without Si-Al-Y coatings are compared to illustrate the factors and corresponding mechanism in molten salt environment of 25wt% K2SO4 and 75wt% Na2SO4 at 900 °C. The obtained Si-Al-Y coating was mainly composed of a TiSi2 outer layer, a (Ti, X)5Si4 and (Ti, X)5Si3 (X represents Nb or Cr element) middle layer, a TiAl2 inner layer and a Al-rich inter-diffusion zone. The inter-phase selective corrosion containing corrosion pits extending along α2 phase from lamellar interfaces in hot corrosion tested TiAl alloy was observed. However, by being coated with Si-Al-Y coating, the hot corrosion performance of TiAl alloy was improved remarkably. |
| Databáze: | OpenAIRE |
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