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Characterization of NbSi2: Correlation between Crystal Structure and Mechanical Properties

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Abstract

Enhanced understanding of NbSi2 alloys allows to better control properties and performance. This challenge involves establishing the relationship between processing conditions and the features of the ordered structure of the silicide. Further correlation with mechanical properties remains a challenge. In this study, the dependency between processing conditions and properties of NbSi2 processed by solid-state diffusion was investigated. Pack cementation was used to process NbSi2 with different Si availability conditions (5-20wt.%) at 1000 and 1150 °C. Experimental results showed that hypo-stoichiometric NbSi2 compounds (atomic Si/Nb ratio below 2.0) formed and that lattice distortion increases with reduced Si availability during processing. The measured Young’s modulus (331.69-303.9 GPa) and hardness (13.27-11.13 GPa) on NbSi2 decrease with increasing lattice distortion. Discussion reveals that lattice distortion has contributions from point defects density and the chemical bond of Nb and Si atoms.

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Acknowledgments

Thanks are due to CAPES and CNPq for funding this study and to CB MM for supplying Nb sheets.

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Authors and Affiliations

  1. Post graduation Program in Mechanical Engineering, Universidade Federal do Paraná, Curitiba, Brazil

    Mariane de Toledo Lima Thomé

  2. Mechanical Engineering Departament, Universidade Federal do Paraná, Centro Politécnico, Curitiba, PR, 81531990, Brazil

    Ana Sofia C. M. d’Oliveira

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  1. Mariane de Toledo Lima Thomé
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  2. Ana Sofia C. M. d’Oliveira
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Correspondence to Ana Sofia C. M. d’Oliveira.

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de Toledo Lima Thomé, M., d’Oliveira, A.S.C.M. Characterization of NbSi2: Correlation between Crystal Structure and Mechanical Properties. J. of Materi Eng and Perform 31, 3631–3637 (2022). https://doi.org/10.1007/s11665-021-06505-6

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  • DOI: https://doi.org/10.1007/s11665-021-06505-6

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