Indentation creep study on ultrafine-grained Zn processed by powder metallurgy

Indentation creep study on ultrafine-grained Zn processed by powder metallurgy

Ultrafine-grained Zn (UFG-Zn) with the grain size of about 200nm was processed by Spark Plasma Sintering at 300°C from fine Zn powder. The grain boundaries in the consolidated material were decorated by ZnO dispersoids with a mean thickness of ~20nm. The creep behavior was studied by indentation tes...

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Veröffentlicht in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2014-02, Vol.596, p.170-175
Hauptverfasser: Jenei, P., Gubicza, J., Dirras, G., Lábár, J.L., Tingaud, D.
Format: Artikel
Sprache:eng
Schlagworte:
Activation energy
Applied sciences
Creep
Creep (materials)
Cross-disciplinary physics: materials science
rheology
Deformation, plasticity, and creep
Dislocations
Dispersions
Exact sciences and technology
Grain boundaries
Hardness tests
Indentation
Materials science
Materials synthesis
materials processing
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Nanostructured materials
Physics
Powder metallurgy
Powder metallurgy. Composite materials
Production techniques
Technology
Treatment of materials and its effects on microstructure and properties
Zinc
Zinc oxide
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Zusammenfassung:Ultrafine-grained Zn (UFG-Zn) with the grain size of about 200nm was processed by Spark Plasma Sintering at 300°C from fine Zn powder. The grain boundaries in the consolidated material were decorated by ZnO dispersoids with a mean thickness of ~20nm. The creep behavior was studied by indentation tests in the homologous temperature range of 0.87–0.91. The activation energy of the creep for UFG-Zn was found to be much larger (211–252kJ/mol depending on the oxide content) than the value determined previously for coarse-grained Zn (152–159kJ/mol). The activation energy increased with increasing ZnO content in UFG-Zn. X-ray line profile analysis revealed that the population of the different dislocation slip systems changed during creep deformation, indicating a considerable dislocation activity.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2013.12.050