Effect of ruthenium on the precipitation of topologically close packed phases in Ni-based superalloys of 3rd and 4th generation

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autor(en): Matuszewski K, Rettig R, Matysiak H, Peng Z, Povstugar I, Choi P, Müller J, Raabe D, Spiecker E, Kurzydlowski KJ, Singer R
Zeitschrift: Acta Materialia
Verlag: Elsevier
Jahr der Veröffentlichung: 2015
Band: 95
Seitenbereich: 274-283
ISSN: 1359-6454


Abstract


The precipitation of topologically close packed (TCP) phases is detrimental for the high temperature strength of high refractory Ni-based superalloys. The beneficial influence of Ru with respect to this so called instability is nowadays well accepted. In the present paper the precipitation of topologically close packed (TCP) phases is studied quantitatively in two experimental alloys (one Ru-free and one with addition of Ru) to clarify the mechanism of the Ru effect. It is confirmed that the TCP phase precipitates undergo sequential phase transformation with the tetragonal sigma-phase precipitating first. Ru retards the phase transformation and leads to decreased equilibrium volume fraction of TCP phases. The results clearly indicate that Ru decreases the driving force for TCP phase precipitation. Investigations of crystallography and chemistry of the TCP/matrix interface point to an additional effect by increase of misfit strain energy. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.



FAU-Autoren / FAU-Herausgeber

Matuszewski, Kamil
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)
Müller, Julian Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)
Rettig, Ralf Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)
Singer, Robert Prof. Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)
Spiecker, Erdmann Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)


Zusätzliche Organisationseinheit(en)
Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)


Autor(en) der externen Einrichtung(en)
Max-Planck-Institut für Eisenforschung GmbH (MPIE) / Max Planck Institute for Iron Research
Warsaw University of Technology / Politechnika Warszawska


Zitierweisen

APA:
Matuszewski, K., Rettig, R., Matysiak, H., Peng, Z., Povstugar, I., Choi, P.,... Singer, R. (2015). Effect of ruthenium on the precipitation of topologically close packed phases in Ni-based superalloys of 3rd and 4th generation. Acta Materialia, 95, 274-283. https://dx.doi.org/10.1016/j.actamat.2015.05.033

MLA:
Matuszewski, Kamil, et al. "Effect of ruthenium on the precipitation of topologically close packed phases in Ni-based superalloys of 3rd and 4th generation." Acta Materialia 95 (2015): 274-283.

BibTeX: 

Zuletzt aktualisiert 2018-08-09 um 07:08