Microstructure and mechanical properties of CF/Al composites fabricated by hot coining technique

Autor: Ahmed El-Assal, Mostafa Eid, Saleh Kaytbay, Omayma A. Elkady
Rok vydání: 2021
Předmět:
Zdroj: Ceramics International. 47:21890-21904
ISSN: 0272-8842
DOI: 10.1016/j.ceramint.2021.04.207
Popis: Carbon fiber reinforced aluminium matrix composites (CF/Al) are recently used in lightweight applications. In this study, two groups of composites are fabricated from 0,5,10, 15 &20 wt% CF. One of them is prepared from 12 wt% nano copper (Cu) coated CF and the other is from the uncoated ones. Composites are manufactured by a hot coining technique through mixing the Al powders with CF using ball milling at 250 rpm, following by hot compaction under 700 MPa at 500 °C . The effect of reinforcement weight fraction and surface modification on the microstructure and mechanical properties of CF/Al are investigated. SEM images revealed that the Cu-coated CF samples have lower porosity and higher homogenization than the other non-coated ones. XRD pattern indicates the absence of the undesirable Al 4 C 3 phase in two groups of samples. The microhardness and wear properties of the uncoated CF/Al are significantly improved up to 10 wt % CF. While the ultimate compressive strength value decreased from 320.8 MPa for the pure Al sample to 179.8 MPa for 20 wt % uncoated CF. Cu-coated CF/Al composites showed a higher improvement in the mechanical properties compared with the uncoated composites. The highest reduction percentage between uncoated and coated composites in the wear rate test was about 68.5%. While, the highest increasing percentage recorded in microhardness and compression test were 31.6% and 23.44%, respectively. The results indicated that surface modification of CF could improve the microstructure and mechanical properties of CF/Al composites.
Databáze: OpenAIRE
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