Effect of Cr addition on the properties of aluminide coating layers formed on TiAl alloys
| Autor: | Kyoo Kim, Dong Ju Jung, Hwan Gyo Jung |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Materials science
Metallurgy Alloy Intermetallic Surfaces and Interfaces General Chemistry engineering.material Condensed Matter Physics Surfaces Coatings and Films Coating visual_art Materials Chemistry Aluminium alloy visual_art.visual_art_medium engineering Thin film Ductility Layer (electronics) Aluminide |
| Zdroj: | Surface and Coatings Technology. 154:75-81 |
| ISSN: | 0257-8972 |
| Popis: | TiAl alloys were coated by two different processes with a simple aluminide coating and a Cr+Al-type composite coating for the improvement of oxidation resistance of the alloy. Simple aluminizing was applied to TiAl– X Cr ( X =1, 4, 6 at.%) alloys. A Cr+Al-type composite coating was performed by Cr evaporation on the TiAl substrate followed by pack aluminizing. A simple aluminide coating applied to the Cr-added TiAl alloys showed improvement of ductility and oxidation resistance. This was mainly due to grain refinement of the Cr-added coating layer. The coating layer formed by the composite coating process consisted of the Al 4 Cr outer layer and TiAl 3 inner layer. However, these coating layers were transformed to a Ti(Al,Cr) 3 layer with a L1 2 structure during oxidation. This layer showed much better ductility compared to other coating layers and superior oxidation resistance in cyclic oxidation tests. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect