Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 558, Issue -, Pages 456-461Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.08.028
Keywords
Co, Al co-doped ZnO; Surface morphology; Micro-hardness; Fracture toughness; Vickers indentation; Strain hardening coefficient
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Funding
- FONDECYT, Government of Chile [3110026, 1100349]
- Direction of Investigation, University of Concepcion, Chile
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Combustion synthesized nanocrystalline Co and Al co-doped ZnO powders [(ZN(1-x-y)Co(x)Al(y)O; x=0.04, 0.03, 0.02; y=0.01, 0.02, 0.03)] were fabricated into cylindrical discs by uni-axial pressing and sintered intentionally at 1000 C for 2 h to assess the mechanical performance. The crystallinity of the pure and doped ZnO was confirmed by X-ray diffraction analysis. The microstructures of the sintered samples were investigated by scanning electron microscopy (SEM) to examine the density, porosity, grain size and its distribution. Grains of 0.5-3 mu m were observed for the samples sintered at 1000 degrees C. The mechanical properties such as micro-hardness, fracture toughness and strain hardening co-efficient were investigated by the Vickers indentation method. It was found that the crack mode observed during the indentation on the samples belongs to median cracks under a load of 19.6 N. Also, the hardness was enhanced with increasing mol% of Co, while the trend was reversed with the increase of Al content. In addition, the strain hardening coefficient and fracture toughness were calculated using the indentation data. (C) 2012 Elsevier B.V. All rights reserved.
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