In-situ fabrication of Al(Zn)-Al<sub>2</sub>O<sub>3</sub> graded composite using the aluminothermic reaction during hot pressing

S. M. A. Haghi; S. A. Sajjadi; A. Babakhani

doi:10.1007/s12613-018-1632-5

Volume 25 Issue 7

Jul. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(7): 832-839

S. M. A. Haghi, S. A. Sajjadi, and A. Babakhani, In-situ fabrication of Al(Zn)-Al₂O₃ graded composite using the aluminothermic reaction during hot pressing, Int. J. Miner. Metall. Mater., 25(2018), No. 7, pp. 832-839. https://doi.org/10.1007/s12613-018-1632-5

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S. M. A. Haghi, S. A. Sajjadi, and A. Babakhani, In-situ fabrication of Al(Zn)-Al2O3 graded composite using the aluminothermic reaction during hot pressing, Int. J. Miner. Metall. Mater., 25(2018), No. 7, pp. 832-839. https://doi.org/10.1007/s12613-018-1632-5

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Research Article

In-situ fabrication of Al(Zn)-Al₂O₃ graded composite using the aluminothermic reaction during hot pressing

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Corresponding author:
S. A. Sajjadi E-mail: sajjadi@um.ac.ir
Received: 27 August 2017; Revised: 3 November 2017; Accepted: 6 November 2017

Abstract

Abstract

In this study, the fabrication of multilayer Al(Zn)–Al₂O₃ with different volume fractions of Al₂O₃ was investigated. Al and ZnO powders were milled by a planetary ball mill, after which five-layer functionally graded samples were produced through hot pressing at 580℃ and 90 MPa pressure for 30 min. Formation of reinforcing Al₂O₃ particles occurred in the aluminum matrix via the aluminothermic reaction. Determination of the ignition temperature of the aluminothermic reaction was accomplished using differential thermal and thermogravimetric analyses. Scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffractometery analyses were utilized to characterize the specimens. The thermal analysis results showed that the ignition temperatures for the aluminothermic reaction of layers with the highest and lowest ZnO contents were 667 and 670℃, respectively. Microstructural observation and chemical analysis confirmed the fabrication of Al(Zn)–Al₂O₃ functionally graded materials composites with precipitation of additional Zn in the matrix. Moreover, nearly dense functionally graded samples demonstrated minimum and maximum hardness values of HV 75 and HV 130, respectively.
- metal-matrix composites;
- functionally graded composites;
- thermogravimetric analysis;
- powder processing;
- sintering

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