1. Balancing the strength and ductility of graphene oxide-carbon nanotube hybrid reinforced aluminum matrix composites with bimodal grain distribution.
- Author
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Xu, Z.Y., Li, C.J., Wang, Z., Fang, D., Gao, P., Tao, J.M., Yi, J.H., and Eckert, J.
- Subjects
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ALUMINUM composites , *GRAIN , *CARBON nanotubes , *GRAPHENE oxide , *POWDER metallurgy - Abstract
Graphene oxide-carbon nanotubes hybrid reinforced aluminum matrix composites (GO-CNT/Al) were prepared by powder metallurgy followed by hot extrusion. The strength of the composites was improved by the synergistic effect of carbon nanotubes, in-situ Al 4 C 3 and graphene oxide. Moreover, due to the partially recrystallization of Al matrix promoted by Al 4 C 3 , the matrix exhibits a bimodal grain distribution, which helps to enhance strain-hardening and consequently uniform tensile ductility at high flow stresses. Hence the bimodal grain structure of the matrix combined with the nano-reinforcements leads to enhancing of the strength and ductility synergy. The composite shows a high tensile strength of 249 MPa (175 MPa of pure Al) and keeps almost similar tensile ductility with pure Al (uniform elongation of ~23.1%). • The structure changes of graphene oxide and carbon nanotubes during ball milling were revealed. • The influence of reinforcement dimension on the strengthening mechanism of aluminum matrix composites was emphasized. • The balance between strength and ductility is achieved by different dimension reinforcements and bimodal grain distribution. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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