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

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F18%3A00497067" target="_blank" >RIV/68081723:_____/18:00497067 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1016/j.actamat.2017.09.063" target="_blank" >http://dx.doi.org/10.1016/j.actamat.2017.09.063</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.actamat.2017.09.063" target="_blank" >10.1016/j.actamat.2017.09.063</a>

Result language
angličtina
Original language name
On the nucleation of planar faults during low temperature and high stress creep of single crystal Ni-base superalloys
Original language description
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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
20501 - Materials engineering

Project
<a href="/en/project/GA14-22834S" target="_blank" >GA14-22834S: Phase Stability and Plasticity in Medium-to-High-Entropy Alloys</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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