On the nucleation of planar faults during low temperature and high stress creep of single crystal Ni-base superalloys

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Wu X, Dlouhy A, Eggeler Y, Spiecker E, Kostka A, Somsen C, Eggeler G
Zeitschrift: Acta Materialia
Jahr der Veröffentlichung: 2017
ISSN: 1359-6454
Sprache: Englisch


Abstract


The present work studies the nucleation of planar faults in the early stages of low temperature (750 °C) and high stress (800 MPa) creep of a Ni-base single crystal superalloy (SX). Two families of 60° dislocations with different Burgers vectors were detected in the transmission electron microscope (TEM). These can react and form a planar fault in the γ′ phase. A 2D discrete dislocation model helps to rationalize a sequence of events which lead to the nucleation of a planar fault. First, one 60° channel dislocation approaches another 60° interface dislocation with a different Burgers vector. At a distance of 5 nm, it splits up into two Shockley partials. The interface dislocation is pushed into the γ′-phase where it creates a small antiphase boundary. It can only move on when the leading Shockley partial joins it and creates an overall 1/3<112> superdislocation. This process is fast and therefore is difficult to observe. The results obtained in the present work contribute to a better understanding of the processes which govern the early stages of low temperature and high stress primary creep of SX.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Eggeler, Yolita
Sonderforschungsbereich 953/2 Synthetische Kohlenstoffallotrope
Spiecker, Erdmann Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)


Zusätzliche Organisationseinheit(en)
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)
Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)


Einrichtungen weiterer Autorinnen und Autoren

Ruhr-Universität Bochum (RUB)


Zitierweisen

APA:
Wu, X., Dlouhy, A., Eggeler, Y., Spiecker, E., Kostka, A., Somsen, C., & Eggeler, G. (2017). On the nucleation of planar faults during low temperature and high stress creep of single crystal Ni-base superalloys. Acta Materialia. https://dx.doi.org/10.1016/j.actamat.2017.09.063

MLA:
Wu, X., et al. "On the nucleation of planar faults during low temperature and high stress creep of single crystal Ni-base superalloys." Acta Materialia (2017).

BibTeX: 

Zuletzt aktualisiert 2019-29-05 um 08:22