Thermal stability of interfaces between the niobium matrix and γ-Nb5Si3 silicide in eutectic Nb–Si composites

Svetlov I.L., Kuzmina N.A., Zavodov A.V., Zaysev D.V.
UDC
669.293:669.018.95
DOI
10.18577/2307-6046-2018-0-8-28-37
Article PDF (Russian) (939.58 KB)
How to cite
Svetlov I.L., Kuzmina N.A., Zavodov A.V., Zaysev D.V. Thermal stability of interfaces between the niobium matrix and γ-Nb5Si3 silicide in eutectic Nb–Si composites // Proceedings of VIAM. 2018. No. 8. DOI: 10.18577/2307-6046-2018-0-8-28-37. URL: https://test.viam.ru/en/journal/2018/8/3
Keywords
Nb–Si in situ composites, microstructure, Dankov–Konobeevsky structural and dimensional relation, crystal-chemical analysis, structure of interfaces.
Abstract

The high thermal stability of the structure of the Nb–Si composite was substantiated experimentally and from the crystallochemical standpoints. The metallographic analysis of the microstructure of the composite in the initial state and after high-temperature homogenization is carried out. The phenomenon of microliquation of alloying elements has been studied. The directions of the predominant growth of the Nb matrix and silicide γ-Nb5Si3 in the process of directional crystallization are determined. By the methods of transmission electron microscopy, the orientational relationships between the niobium matrix and the silicide γ-Nb5Si3 were found: ˂111˃Nbss||˂0001˃γ-Nb5Si3 and {110}Nbss||γ-Nb5Si3. Based on the crystal-chemical analysis of the orientation and dimensional correspondence of the crystal structures of the matrix and silicide on the interfaces, the high structural thermal stability of the Nb–Si composite is substantiated.

 

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