Azim, M.A. and Gorr, B. and Christ, H.-J. and Lenchuk, O. and Albe, K. and Schliephake, D. and Heilmaier, M. (2017):
Effect of Ti content and nitrogen on the high-temperature oxidation behavior of (Mo,Ti) 5 Si 3.
In: Intermetallics, 90pp. 103-112, ISSN 09669795,
[Online-Edition: https://doi.org/10.1016/j.intermet.2017.05.023],
[Article]
Abstract
The binary intermetallic compounds Mo_5Si_3 (T1) and Ti_5Si_3 are prone to rapid oxidation below 1000 °C. Recent investigations on (Mo,Ti)_5Si_3, however, revealed that macro-alloying with 40 at.% Ti can result in a very good oxidation resistance in a wide temperature range (750–1300 °C) due to the formation of a duplex layer composed of a silica matrix with dispersed titania. Additionally, Ti decreases density making (Mo,Ti)_5Si_3 a promising key constituent of quaternary Mo-Si-B-Ti alloys considered for ultrahigh temperature structural applications. The aim of this study is to obtain an in-depth understanding of the influence of different Ti concentrations as well as of nitrogen on the oxidation behavior of (Mo,Ti)_5Si_3 at intermediate and elevated temperatures. The microstructure and oxidation mechanisms were analyzed using various experimental techniques. The experimental results were supported by ab initio and thermodynamic calculations.
| Item Type: | Article |
|---|---|
| Erschienen: | 2017 |
| Creators: | Azim, M.A. and Gorr, B. and Christ, H.-J. and Lenchuk, O. and Albe, K. and Schliephake, D. and Heilmaier, M. |
| Title: | Effect of Ti content and nitrogen on the high-temperature oxidation behavior of (Mo,Ti) 5 Si 3 |
| Language: | English |
| Abstract: | The binary intermetallic compounds Mo_5Si_3 (T1) and Ti_5Si_3 are prone to rapid oxidation below 1000 °C. Recent investigations on (Mo,Ti)_5Si_3, however, revealed that macro-alloying with 40 at.% Ti can result in a very good oxidation resistance in a wide temperature range (750–1300 °C) due to the formation of a duplex layer composed of a silica matrix with dispersed titania. Additionally, Ti decreases density making (Mo,Ti)_5Si_3 a promising key constituent of quaternary Mo-Si-B-Ti alloys considered for ultrahigh temperature structural applications. The aim of this study is to obtain an in-depth understanding of the influence of different Ti concentrations as well as of nitrogen on the oxidation behavior of (Mo,Ti)_5Si_3 at intermediate and elevated temperatures. The microstructure and oxidation mechanisms were analyzed using various experimental techniques. The experimental results were supported by ab initio and thermodynamic calculations. |
| Journal or Publication Title: | Intermetallics |
| Volume: | 90 |
| Uncontrolled Keywords: | Intermetallic compound, (Mo,Ti)5Si3, High-temperature oxidation behavior, Thermodynamic calculations, First-principles calculations |
| Divisions: | 11 Department of Materials and Earth Sciences > Material Science > Materials Modelling Zentrale Einrichtungen > University IT-Service and Computing Centre (HRZ) > Hochleistungsrechner 11 Department of Materials and Earth Sciences > Material Science Zentrale Einrichtungen > University IT-Service and Computing Centre (HRZ) 11 Department of Materials and Earth Sciences Zentrale Einrichtungen |
| Date Deposited: | 08 Sep 2017 06:39 |
| Official URL: | https://doi.org/10.1016/j.intermet.2017.05.023 |
| Identification Number: | doi:10.1016/j.intermet.2017.05.023 |
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