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Type: Journal article
Title: In situ synthesis and characterization of a hierarchically structured Al₂0₃/Al₃Ti composite
Other Titles: In situ synthesis and characterization of a hierarchically structured Al(2)0(3)/Al(3)Ti composite
Author: Zhu, H.
Jiang, Y.
Song, J.
Li, J.
Munroe, P.
Xie, Z.
Citation: Journal of Materials Science, 2012; 48(2):929-935
Publisher: Springer Link
Issue Date: 2012
ISSN: 0022-2461
Statement of
Heguo Zhu, Yaling Jiang, Jinzhu Song, Jianliang Li, Paul Munroe, Zonghan Xie
Abstract: A hierarchically structured α-Al₂O₃/Al₃Ti composite was fabricated by an in situ process called exothermic dispersive synthesis from a powder blend of Al and TiO₂. The microstructure of the composite was investigated by X-ray diffraction, scanning electron microscopy, and X-ray energy dispersive spectroscopy. Three transitional phases, specifically TiO, Ti₂O₃, and γ-Al₂O₃, were found to form during the reactive process. Using differential scanning calorimetry, it was found that the reaction between the Al and TiO₂ occurred through three intermediate steps and their corresponding activation energies were 390, 205, and 197 kJ/mol, respectively. Moreover, the reaction rate of the third step was found to be much higher than that of the second step, and the time taken by each reaction step decreased with the increase of the heating rate. The findings are critical to understanding the microstructural development in the synthesis of strong and tough Al₂O₃/Al₃Ti composites.
Keywords: Materials Science, general
Characterization and Evaluation of Materials
Polymer Sciences
Continuum Mechanics and Mechanics of Materials
Rights: © Springer Science+Business Media, LLC 2012
DOI: 10.1007/s10853-012-6817-0
Published version:
Appears in Collections:Aurora harvest 4
Materials Research Group publications
Mechanical Engineering publications

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