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Journal of Materials Science

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23-04-2018 | Composites

Microstructural characterization of Al₄C₃ in aluminum–graphite composite prepared by electron-beam melting

Authors: Beihai Ma, Jie Wang, Tae H. Lee, Stephen E. Dorris, Jianguo Wen, Uthamalingam Balachandran

Published in: Journal of Materials Science | Issue 14/2018

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Abstract

We prepared graphite-infused aluminum composites by electron-beam vacuum melting and electromagnetic stirring with 0% and 4 wt% graphite addition. Bulk density of 2.69 g/cm³ was measured for samples with 0% graphite addition (AlCv0) and 2.66 g/cm³ for samples with 4 wt% graphite addition (AlCv4). Both are > 99% of their theoretical values. X-ray diffraction indicated that AlCv0 is phase pure, while the AlCv4 sample is a composite consisting of aluminum, Al₄C₃, and graphite. Electron microscopy and energy-dispersive X-ray spectroscopy revealed pockets of carbon-rich phase of 10–50 μm in sizes dispersed in the Al matrix in AlCv4. Scanning transmission electron microscopy showed that Al₄C₃ crystallites of 1–2 μm sizes are mostly located near the outer shell of the pockets of carbon-rich phase and with undissolved graphite at the center. Thermal conductivity of 107.8 W/m K was measured for the AlCv4 and 226.7 W/m K for the AlCv0. Our work demonstrated the feasibility of producing pore-free high-density graphite-infused aluminum composite materials by electron-beam melting and electromagnetic stirring in vacuum.

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Title: Microstructural characterization of Al4C3 in aluminum–graphite composite prepared by electron-beam melting
Authors: Beihai Ma
Jie Wang
Tae H. Lee
Stephen E. Dorris
Jianguo Wen
Uthamalingam Balachandran
Publication date: 23-04-2018
Publisher: Springer US
Published in: Journal of Materials Science / Issue 14/2018
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-018-2336-y

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