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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. ; Gorr, B. ; Christ, H.-J. ; Lenchuk, O. ; Albe, K. ; Schliephake, D. ; Heilmaier, M. :
Effect of Ti content and nitrogen on the high-temperature oxidation behavior of (Mo,Ti) 5 Si 3.
[Online-Edition: https://doi.org/10.1016/j.intermet.2017.05.023]
In: Intermetallics, 90 pp. 103-112. ISSN 09669795
[Artikel], (2017) (Eingereicht)

Offizielle URL: https://doi.org/10.1016/j.intermet.2017.05.023

Kurzbeschreibung (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.

Typ des Eintrags: Artikel
Erschienen: 2017
Autor(en): Azim, M.A. ; Gorr, B. ; Christ, H.-J. ; Lenchuk, O. ; Albe, K. ; Schliephake, D. ; Heilmaier, M.
Titel: Effect of Ti content and nitrogen on the high-temperature oxidation behavior of (Mo,Ti) 5 Si 3
Sprache: Englisch
Kurzbeschreibung (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.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Intermetallics
Band: 90
Freie Schlagworte: Intermetallic compound, (Mo,Ti)5Si3, High-temperature oxidation behavior, Thermodynamic calculations, First-principles calculations
Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Materialmodellierung
Zentrale Einrichtungen > Hochschulrechenzentrum (HRZ) > Hochleistungsrechner
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
Zentrale Einrichtungen > Hochschulrechenzentrum (HRZ)
11 Fachbereich Material- und Geowissenschaften
Zentrale Einrichtungen
Hinterlegungsdatum: 08 Sep 2017 06:39
Offizielle URL: https://doi.org/10.1016/j.intermet.2017.05.023
ID-Nummer: doi:10.1016/j.intermet.2017.05.023
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