TY - JOUR
T1 - Thermal evolution of Fe - ZrO2 nanocomposite
T2 - Insights from calorimetric and microscopy investigations
AU - Raghavendra, K. G.
AU - Dasgupta, Arup
AU - Hajra, Raj Narayan
AU - Jayasankar, K.
AU - Srihari, V.
AU - Saroja, S.
N1 - Funding Information:
The authors thank Dr. A. K. Bhaduri, Director IGCAR and Dr. G Amarendra, Director, MMG, for their constant support and encouragement during the course of this work. Authors gratefully acknowledge the experimental support provided by UGC DAE CSR Kalpakkam node for SEM facility and RRCAT Indore for synchrotron facilities. One of the authors (RKG) acknowledges DAE, India for the fellowship.
Publisher Copyright:
© 2017 Elsevier Inc.
PY - 2017/10
Y1 - 2017/10
N2 - This article presents the results of an experimental study on the evolution of phases during annealing of ball milled Fe – ZrO2 nanocomposite powder using Differential Scanning Calorimetry, X-ray Diffraction and Electron Microscopy techniques. The formation of FeO phase from Fe and Fe3O4 is identified through Differential Scanning Calorimetry and confirmed using Synchrotron Diffraction and Transmission Electron Microscopy. Qualitative X-ray phase analysis showed the stoichiometry of the FeO phase as Fe0.87O. This phase is expected to be beneficial as it offers strengthening in the Fe matrix and is thermally stable. The activation energy of formation of the Fe0.87O phase was estimated to be ~ 195 kJ mol− 1. This phase is also found to be partially stabilizing the cubic phase of ZrO2, at high temperatures. A cubic ⇆ tetragonal transformation of ZrO2 was identified at 1140 K. A rather broad peak was observed for Fe α → γ transformation in the Calorimetry thermograms as the Fe grains were nanocrystalline which became sharper as the crystallites grew in size.
AB - This article presents the results of an experimental study on the evolution of phases during annealing of ball milled Fe – ZrO2 nanocomposite powder using Differential Scanning Calorimetry, X-ray Diffraction and Electron Microscopy techniques. The formation of FeO phase from Fe and Fe3O4 is identified through Differential Scanning Calorimetry and confirmed using Synchrotron Diffraction and Transmission Electron Microscopy. Qualitative X-ray phase analysis showed the stoichiometry of the FeO phase as Fe0.87O. This phase is expected to be beneficial as it offers strengthening in the Fe matrix and is thermally stable. The activation energy of formation of the Fe0.87O phase was estimated to be ~ 195 kJ mol− 1. This phase is also found to be partially stabilizing the cubic phase of ZrO2, at high temperatures. A cubic ⇆ tetragonal transformation of ZrO2 was identified at 1140 K. A rather broad peak was observed for Fe α → γ transformation in the Calorimetry thermograms as the Fe grains were nanocrystalline which became sharper as the crystallites grew in size.
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U2 - 10.1016/j.matchar.2017.09.010
DO - 10.1016/j.matchar.2017.09.010
M3 - Article
AN - SCOPUS:85029587195
SN - 1044-5803
VL - 132
SP - 448
EP - 457
JO - Materials Characterization
JF - Materials Characterization
ER -