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

Jenei, P. and Gubicza, J. and Dirras, G. and Lábár, János (2014) Indentation creep study on ultrafine-grained Zn processed by powder metallurgy. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCURE AND PROCESSING, 596. pp. 170-175. ISSN 0921-5093

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Abstract

Ultrafine-grained Zn (UFG-Zn) with the grain size of about 200 nm was processed by Spark Plasma Sintering at 300 1C from fine Zn powder. The grain boundaries in the consolidated material were decorated by ZnO dispersoids with a mean thickness of ~20 nm. 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 (211–252 kJ/mol depending on the oxide content) than the value determined previously for coarse-grained Zn (152–159 kJ/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. 2013 Elsevier B.V. All rights reserved.

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