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An Overview on Effect of Alloying Elements on the Phase Formation, Mechanical and Oxidation Properties of Nb-Nb Silicide In Situ Composites

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Abstract

This paper reflects on the potentiality and development of the Nb-Si alloys for the hot section components of the futuristic turbine engine. The Nb-Si alloys consist of ductile Nbss phase as the matrix in which the brittle and oxidation resistant silicide phases (Nb3Si/Nb5Si3) arrange as dispersion or vice-versa. Thereby, the fracture toughness, high temperature strength and creep resistance along with the oxidation resistance can be balanced. However, further improvement in the room temperature fracture toughness, the resistance to intermediate pest damage and the high temperature oxidation is necessary to use them as turbine airfoils. Therefore, the concept of various processing techniques and developing into multicomponent systems has been in practice to obtain better combination of both room and high temperature properties. The present paper highlights the importance of the alloying addition on the phase formation, microstructure, mechanical and oxidation properties and the consolidated literature results are presented. Further, the fracture behavior and the need for the development of new coatings to these alloys are discussed. Finally, the present paper highlights the potentiality of Nb-Si alloys as the hot section material and the future directions of research and development are discussed.

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All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest or non-financial interest in the subject matter or materials discussed in this manuscript.

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The authors are thankful to Defence Research and Development Organization (DMRL) for giving permission to carry out this research work.

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  1. Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad, 500058, India

    Geethasree Kommineni & Satya Prasad V. V.

  2. Department of Metallurgical and Materials Engineering, National Institute of Technology, Warangal, Warangal, 506004, India

    Geethasree Kommineni & Brahma Raju Golla

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by [Geethasree Kommineni] and [Brahma Raju Golla]. The first draft of the manuscript was written by [Geethasree Kommineni] and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Kommineni, G., Golla, B.R. & Prasad V. V., S. An Overview on Effect of Alloying Elements on the Phase Formation, Mechanical and Oxidation Properties of Nb-Nb Silicide In Situ Composites. Silicon 15, 651–681 (2023). https://doi.org/10.1007/s12633-022-02051-5

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  • DOI: https://doi.org/10.1007/s12633-022-02051-5

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