| Influences of nano-3Y-TZP reinforcement on phase transformation and crystallite size modifi cation of zirconia-toughened alumina and Rietveld refinement of crystallographic data |
| Sajib Aninda Dhar1, Saugata Sarker2, Homayra Tabassum Mumu2, A. K. M. Bazlur Rashid2 |
1Pilot Plant and Process Development Centre (PP & PDC) , Bangladesh Council of Scientifi c and Industrial Research , Dr. Qudrat i Khuda Road , Dhaka 1205 , Bangladesh
2Department of Materials and Metallurgical Engineering , Bangladesh University of Engineering and Technology , Zahir Raihan Road , Dhaka 1000 , Bangladesh |
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Received: June 6, 2022; Revised: November 23, 2022 Accepted: November 27, 2022. Published online: December 21, 2022. |
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| ABSTRACT |
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The effects of varying amount of nano-3 mol% yttria-stabilized zirconia addition on the crystal structures, mechanical, and microstructural properties of zirconia-toughened alumina (ZTA) composite have been investigated in this work. The ZTA specimens were prepared by different 3Y-TZP amount ranging from 9 to 18 wt.% and sintered at 1550 °C for 2 h. The densification behaviour, indentation fracture toughness, microhardness, elastic modulus, flexural strength and surface morphology of the composites have been determined and correlated with tetragonal → monoclinic phase transformation and retention of tetragonal phase. Rietveld refinement of the crystallographic data was performed to correlate the eff ect of zirconia addition on the phase compositions, t → m transformability and impacts on crystallite sizes and lattice parameter. The toughness and flexural strength of the composites improved significantly up to 15 wt.% YSZ addition followed by a reduction for 18 wt.%, while the hardness and elastic modulus decreased with YSZ addition. Rietveld refi nement ascertains the metastable t-ZrO2 retention and thermodynamically stable m-ZrO2 transformation with increasing 3Y-TZP and subsequent enhancement in fracture toughness through transformation toughening. |
| Key words:
ZTA · Rietveld refi nement · Transformation toughening · Phase transformation |
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