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[4] L. Portebois, S. Mathieu, Y. Bouizi, M. Vilasi, and S. Mathieu, "Effect of boron addition on the oxidation resistance of silicide protective coatings: A focus on boron location in as-coated and oxidised coated niobium alloys," Surface and Coatings Technology, vol. 253, pp. 292-299, 2014/08/25/ 2014."/>

2025 - Sustainable Industrial Processing Summit
SIPS2025 Volume 13. Intl. Symp on Solid State Chemistry, Physical Chemistry, Corrosion and Coating

Editors:F. Kongoli, I. Chung, H. Kageyama, M.G. Kanatzidis, F. Marquis, A. Navrotsky, A. Tressaud, J. Atwood, G. Duca, R. Kuroda, A. Legocki, J. Lipkowski, M. Zaworotko, R. Singh, R. Gupta, M. Halama, D. Macdonald, F. Wang
Publisher:Flogen Star OUTREACH
Publication Year:2025
Pages:262 pages
ISBN:978-1-998384-62-4 (CD)
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
CD-SIPS2025_Volume1
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    MICROSTRUCTURE AND OXIDATION BEHAVIOR OF TiCrAlNb(Si,B)x MULTI-PRINCIPAL ELEMENT ALLOYS

    Hongbo Shi1;
    1UNIVERSITY OF SHEFFIELD, Sheffield, United Kingdom;
    Type of Paper: Regular
    Id Paper: 41
    Topic: 66

    Abstract:

    Titanium alloys are widely used as aerospace structural materials because of their low density, high strength and excellent corrosion resistance at low-to-moderate temperatures. However, when the working temperature is over 400°C, titanium alloys usually show a poor oxidation resistance because of the fast diffusion of oxygen through the nascent TiO2–X surface oxide layer[1]. On the other hand, SiO2 shows considerable promise as a protective oxide layer, for both high temperature oxidation corrosion; however, the most successful application so far of Si–based oxides to Ti–alloys is the preprocessed amorphous (or ‘enamel’) SiO2 coating [2]. Ti–based Multi-Principal Element Alloys with added Si potentially provide a novel opportunity to find new alloy compositions which could form an SiO2–based layer spontaneously at elevated temperatures [3]. Boron has also been suggested as a further alloying addition, that could avoid the possible issue of pesting of formed silicide compounds in such MPEAs at intermediate temperatures [4].

    This research builds an equimolar TiCrAlNb MPEA alloy system with different ratios of Si and/or B content and characterizes their microstructure, before and after oxidation, to study the influence of the addition of silicon and boron. The oxidation resistance of such alloys shows in general a significant improvement compared with a typical Ti-6Al-4V Ti–alloy. Furthermore, Niobium shows a higher tendency to form compounds with silicon/boron. In addition to such silicide/boride compounds, some laves phases were also observed and the addition of silicon showed a significant influence on the microstructure, the addition of B refines the lamellar microstructure while the addition of Si transfers the structure into an equiaxed dendritic structure.
     

    Keywords:

    Titanium Alloy; MPEA; Microstructure; Oxidation

    Cite this article as:

    Shi H. (2024). MICROSTRUCTURE AND OXIDATION BEHAVIOR OF TiCrAlNb(Si,B)x MULTI-PRINCIPAL ELEMENT ALLOYS. In F. Kongoli, I. Chung, H. Kageyama, M.G. Kanatzidis, F. Marquis, A. Navrotsky, A. Tressaud, J. Atwood, G. Duca, R. Kuroda, A. Legocki, J. Lipkowski, M. Zaworotko, R. Singh, R. Gupta, M. Halama, D. Macdonald, F. Wang (Eds.), Sustainable Industrial Processing Summit Volume 13 Intl. Symp on Solid State Chemistry, Physical Chemistry, Corrosion and Coating (pp. 259-260). Montreal, Canada: FLOGEN Star Outreach