Azim, M. A. ; Gorr, B. ; Christ, H.-J. ; Lenchuk, O. ; Albe, K. ; Schliephake, D. ; Heilmaier, M. (2017):
Effect of Ti content and nitrogen on the high-temperature oxidation behavior of (Mo,Ti) 5 Si 3.
In: Intermetallics, 90, pp. 103-112. Elsevier, ISSN 0966-9795,
DOI: 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. ; Gorr, B. ; Christ, H.-J. ; Lenchuk, O. ; Albe, K. ; Schliephake, D. ; 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 |
| Journal volume: | 90 |
| Publisher: | Elsevier |
| Uncontrolled Keywords: | Intermetallic compound, (Mo,Ti)5Si3, High-temperature oxidation behavior, Thermodynamic calculations, First-principles calculations |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Materials Modelling Zentrale Einrichtungen Zentrale Einrichtungen > University IT-Service and Computing Centre (HRZ) Zentrale Einrichtungen > University IT-Service and Computing Centre (HRZ) > Hochleistungsrechner |
| Date Deposited: | 08 Sep 2017 06:39 |
| DOI: | 10.1016/j.intermet.2017.05.023 |
| Identification Number: | doi:10.1016/j.intermet.2017.05.023 |
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