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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文章导航 > 矿物冶金与材料学报（英文） > 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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研究论文

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

Department of Materials Science and Engineering, Engineering faculty, Ferdowsi University of Mashhad, Mashhad, Iran

通讯作者:
S. A. Sajjadi E-mail: sajjadi@um.ac.ir

中文摘要

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.

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

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

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