Yield stress anomaly and creep of single crystal Ni-base superalloys Role of particle size
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F24%3A00586775" target="_blank" >RIV/68081723:_____/24:00586775 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0921509324003344?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0921509324003344?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.msea.2024.146403" target="_blank" >10.1016/j.msea.2024.146403</a>
Alternative languages
Result language
angličtina
Original language name
Yield stress anomaly and creep of single crystal Ni-base superalloys Role of particle size
Original language description
In the present work we subject the single crystal Ni-base superalloy ERBO1 (CMSX 4 type) to constant strain rate (CSR) and creep testing at temperatures between 1023 and 1223 K. Three material states are considered which have similar particle volume fractions >60% but differ in gamma '-particle sizes (material states S, M and L of particle sizes: 240, 390 and 540 nm). In constant strain rate testing, a yield stress anomaly is observed for all three material states, with a yield stress maximum at 1073 K. This increase of strength with increasing temperature is not observed during creep testing at significantly lower deformation rates in this low temperature high stress creep regime, where different elementary deformation mechanisms govern CSR and creep behavior. In contrast, in the low stress high temperature creep regime, stress/strain rate data pairs from CSR creep tests both show decreasing strength with increasing temperature. It is found that in both types of tests the material state M shows the highest strength (highest yield stress and lowest creep rate). This can be rationalized based on a scenario where both, gamma-channel and gamma '-particle dislocation activities are important. Diffraction contrast transmission electron microscopy is used to study the relevant elementary deformation processes. Details of dislocation arrangements are discussed with a special focus on the role of Kear Wilsdorf (KW) locks, gamma '-particle shearing by superlattice stacking faults (extrinsic and intrinsic) and dislocation climb.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20501 - Materials engineering
Result continuities
Project
<a href="/en/project/GA20-11321S" target="_blank" >GA20-11321S: Influence of microstructure and surface treatments on hydrogen intake in bio-compatible alloys</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Materials Science and Engineering A Structural Materials Properties Microstructure and Processing
ISSN
0921-5093
e-ISSN
1873-4936
Volume of the periodical
899
Issue of the periodical within the volume
MAY
Country of publishing house
CH - SWITZERLAND
Number of pages
15
Pages from-to
146403
UT code for WoS article
001238366500001
EID of the result in the Scopus database
2-s2.0-85189861287