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Effect of Ti content and nitrogen on the high-temperature oxidation behavior of (Mo,Ti) 5 Si 3

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, pp. 103-112, 90, 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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