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Published in: Metallurgical and Materials Transactions A 3/2018

11-10-2017 | Topical Collection: Next Generation Superalloys and Beyond

Phase Evolution in and Creep Properties of Nb-Rich Nb-Si-Cr Eutectics

Authors: Florian Gang, Alexander Kauffmann, Martin Heilmaier

Published in: Metallurgical and Materials Transactions A | Issue 3/2018

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Abstract

In this work, the Nb-rich ternary eutectic in the Nb-Si-Cr system has been experimentally determined to be Nb-10.9Si-28.4Cr (in at. pct). The eutectic is composed of three main phases: Nb solid solution (Nbss), β-Cr2Nb, and Nb9(Si,Cr)5. The ternary eutectic microstructure remains stable for several hundred hours at a temperature up to 1473 K (1200 °C). At 1573 K (1300 °C) and above, the silicide phase Nb9(Si,Cr)5 decomposes into α-Nb5Si3, Nbss, and β-Cr2Nb. Under creep conditions at 1473 K (1200 °C), the alloy deforms by dislocation creep while the major creep resistance is provided by the silicide matrix. If the silicide phase is fragmented and, thus, its matrix character is destroyed by prior heat treatment [e.g., at 1773 K (1500 °C) for 100 hours], creep is mainly controlled by the Laves phase β-Cr2Nb, resulting in increased minimum strain rates. Compared to state of the art Ni-based superalloys, the creep resistance of this three-phase eutectic alloy is significantly higher.

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Metadata
Title
Phase Evolution in and Creep Properties of Nb-Rich Nb-Si-Cr Eutectics
Authors
Florian Gang
Alexander Kauffmann
Martin Heilmaier
Publication date
11-10-2017
Publisher
Springer US
Published in
Metallurgical and Materials Transactions A / Issue 3/2018
Print ISSN: 1073-5623
Electronic ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-017-4367-4

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