The Influence of Production Technology on the Structure
and Mechanical Properties of Niobium–Silicon–Aluminum Alloys

I. V. Sapegina; Сапегина И. В.; A. N. Lubnin; Лубнин А. Н.; V. I. Ladyanov; Ладьянов В. И.

doi:10.31857/S0015323022601556

The Influence of Production Technology on the Structure and Mechanical Properties of Niobium–Silicon–Aluminum Alloys

Authors: Sapegina I.V.¹, Lubnin A.N.¹, Ladyanov V.I.¹
Affiliations:
1. Udmurt Federal Research Centre of the Ural Branch of the Russian Academy of Sciences
Issue: Vol 124, No 3 (2023)
Pages: 317-322
Section: ПРОЧНОСТЬ И ПЛАСТИЧНОСТЬ
URL: https://rjmseer.com/0015-3230/article/view/662805
DOI: https://doi.org/10.31857/S0015323022601556
EDN: https://elibrary.ru/CLUQRH
ID: 662805

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Abstract

Cast Nb–14 at % Si–9 at % Al alloys fabricated by self-propagating high-temperature synthesis (SHS) and by SHS followed by electric arc remelting have been investigated. A structure consisting of a solid solution of silicon and aluminum in niobium (NbSS), a Nb3Al intermetallic compound, and a β-Nb5(Si,Al)3
silicide formed in the alloy fabricated by SHS. Electric arc remelting suppressed the formation of the Nb3Al
phase and resulted in the formation of a dispersed two-phase NbSS and β-Nb5(Si, Al)3 structure in the alloy.
The increased volume fraction of NbSS and the dispersed structure formed after electric arc remelting in the
alloy increase its fracture toughness to 14.8 ± 0.8 MPa m1/2 compared to 7.7 ± 0.8 MPa m1/2 for the SHSprepared
alloy.

Keywords

niobium silicides, SHS, hardness, fracture toughness

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