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Open AccessArticle

Niobium Base Superalloys: Achievement of a Coherent Ordered Precipitate Structure in the Nb Solid-Solution

1
Grenoble Alpes University, CEA-Grenoble, LITEN, DTNM, L2N, 17 rue des Martyrs, 38054 Grenoble CEDEX 09, France
2
Normandie University, UNIROUEN, INSA Rouen, CNRS, Groupe de Physique des Matériaux, 76000 Rouen, France
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(7), 345; https://doi.org/10.3390/cryst9070345
Received: 30 April 2019 / Revised: 29 May 2019 / Accepted: 29 June 2019 / Published: 5 July 2019
(This article belongs to the Special Issue Fundamentals of Superalloys)
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Abstract

In a previous work, the chemical elements necessary for the achievement of Niobium base superalloys were defined in order to get a structure equivalent to that of Nickel base superalloys, which contain ordered precipitates within a disordered solid-solution. It was especially emphasized that precipitation hardening in the Niobium matrix would be possible with the addition of Ni. The remaining question about the design of such Niobium superalloys concerned the achievement of ordered precipitates in crystalline coherence with the Nb matrix i.e., with a crystalline structure equivalent to the Nb crystal prototype and with a lattice parameter in coherency with that of the Nb matrix. In order to reduce the trial/error experimental work, a reasoning based on various data for the achievement of coherency is presented. Then, starting from the Nb-Hf-Ni ternary alloy thus defined, this paper demonstrates that the precipitation of an ordered Nb phase within a disordered Nb matrix can be achieved with lattice parameter coherency between the ordered precipitates and the disordered matrix. The chemistry and the crystallographic structure of the precipitates were characterized using Transmission Electron Microscopy and Atom Probe Tomography. These results can help to conceive a new family of Nb base superalloys. View Full-Text
Keywords: Niobium superalloys; alloy design; ordered coherent precipitates; transmission electron microscopy; atom probe tomography Niobium superalloys; alloy design; ordered coherent precipitates; transmission electron microscopy; atom probe tomography
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Saint-Antonin, F.; Lefebvre, W.; Blum, I. Niobium Base Superalloys: Achievement of a Coherent Ordered Precipitate Structure in the Nb Solid-Solution. Crystals 2019, 9, 345.

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