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- Article name
- Improvement of chromium-nickel alloys for space application
- Authors
- BUTRIM V. N., , info@kompozit-mv.ru, Institute of Nova Metallurgical Technology JSC Komposit, Korolev, Moscow region, Russia
- Keywords
- Cr-Ni alloy / ab initio calculations / cohesion / grain boundary / microstructure / strength properties / heat resistance / thermo-catalytic engine / nozzle details / fuel decomposition chamber
- Year
- 2017 Issue 2 Pages 26 - 38
- Code EDN
- Code DOI
- Abstract
- Ab initio based calculations have been used for investigate the influence of a number of transitional metals 4d and 5d of groups of the Mendeleyev's Periodic Table on the cohesive properties of bulk and interfaces of Cr-base (α, bcc) and Ni-base (γ, fcc) solid solutions which form the microstructure of two-phase (α + γ) Cr-Ni-base alloys. W, Ta and Nb have been identified as the alloying elements that improve the cohesive strength of grain boundaries (GBs) and increase the bulk cohesive energy of both α and γ phases. The offered composition design concept is confirmed experimentally: increasing in content of tungsten in Cr-Ni alloy to 10 wt.% the allows to increase its tensile strength for 15-20 % at level of elongation in 12-16 %; the additional alloying of Cr-Ni alloy by small additives of tantalum and niobium promote to increase in its resistance of creep and long durability at temperatures over 800 оC; replacement of nickel by tantalum increases its heat resistance, at least to temperature of 1500 оC.
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