The effect of deviations from precise [001] tensile direction on creep of Ni-base single crystal superalloys

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F22%3A00553533" target="_blank" >RIV/68081723:_____/22:00553533 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S1359646221005546?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1359646221005546?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.scriptamat.2021.114274" target="_blank" >10.1016/j.scriptamat.2021.114274</a>

Result language
angličtina
Original language name
The effect of deviations from precise [001] tensile direction on creep of Ni-base single crystal superalloys
Original language description
Low temperature (1023 K) high stress (800 MPa) tensile creep behavior of the superalloy single crystal ERBO-1 (CMSX-4 type) is investigated. Three loading directions are compared: precise [001] and 15 degrees deviations from [001] towards [111] and [011]. It is found that creep rates (epsilon)over dot scale as (epsilon)over dot([001]->[111]) > (epsilon)over dot ([001]) > (epsilon)over dot([001]->[011]) already in the early stages of creep (epsilon <= 1%), where dislocation network formation and planar fault intersections cannot rationalize the observed rate effects. An analysis based on Peach-Kohler force calculations suggests, that fast creep rates are observed, when dislocations from two octahedral systems, which are required to react and form the leading part of a planar fault ribbon in the gamma'-phase, experience similar driving forces. Creep data, micromechanical calculations and TEM results are in good qualitative agreement. From a technological point of view, the results show that while 15 degrees deviations from [001] towards [011] can be tolerated, deviations towards [111] must be avoided. (C) 2021 The Author(s). Published by Elsevier Ltd on behalf of Acta Materialia Inc.
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/EF16_025%2F0007304" target="_blank" >EF16_025/0007304: Architectured materials designed for additive manufacturing</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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