Dynamic behavior of graphene reinforced aluminum composites

Bao Zhang; Xudong Wang; Liu Chen; Xingwu Li; Bao Zhang; Xudong Wang; Liu Chen; Xingwu Li

doi:10.3934/matersci.2018.2.338

AIMS Materials Science

2018, Volume 5, Issue 2: 338-348. doi: 10.3934/matersci.2018.2.338

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Research article

Dynamic behavior of graphene reinforced aluminum composites

Beijing Institute of Aeronautical Materials, Haidian District, Beijing 100095, China

Received: 10 January 2018 Accepted: 21 March 2018 Published: 24 April 2018

Graphene-reinforced aluminum (Al) composites fabricated via powder metallurgy were characterized in terms of mechanical properties and deformed microstructure respectively by Split Hopkinson Pressure Bar (SHPB) and scanning electron microscopy (SEM) equipped with an energy-dispersive X-ray spectroscopy (EDX). Due to the incorporation of graphene nanoflakes (GNFs), yield strength of Al was elevated by three times at quasi-static loading, and reached 720 MPa at strain rate of ~3000 s⁻¹. Although the fabricated composites exhibited decreases in strain hardening rate and strain rate sensitivity, the maximum flow stress showed a monotonous trend of increasing with strain rate, and exceeded 750 MPa upon dynamic loading. Load transfer was considered the main mechanism accounting for composite superior properties at high strain rates.
- graphene nanoflakes,
- aluminum composites,
- dynamic behavior,
- strain rate sensitivity
Citation: Bao Zhang, Xudong Wang, Liu Chen, Xingwu Li. Dynamic behavior of graphene reinforced aluminum composites[J]. AIMS Materials Science, 2018, 5(2): 338-348. doi: 10.3934/matersci.2018.2.338

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Abstract

Graphene-reinforced aluminum (Al) composites fabricated via powder metallurgy were characterized in terms of mechanical properties and deformed microstructure respectively by Split Hopkinson Pressure Bar (SHPB) and scanning electron microscopy (SEM) equipped with an energy-dispersive X-ray spectroscopy (EDX). Due to the incorporation of graphene nanoflakes (GNFs), yield strength of Al was elevated by three times at quasi-static loading, and reached 720 MPa at strain rate of ~3000 s⁻¹. Although the fabricated composites exhibited decreases in strain hardening rate and strain rate sensitivity, the maximum flow stress showed a monotonous trend of increasing with strain rate, and exceeded 750 MPa upon dynamic loading. Load transfer was considered the main mechanism accounting for composite superior properties at high strain rates.

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