Influence of Extrusion Temperature on the Microstructure and Mechanical Properties of a 0.5 wt.% Graphene Nanoplatelet-Reinforced Aluminum Composite
Source abstract
Abstract
In this study, hot extrusions at 460, 470, 480, 490, and 500 °C were carried out on 0.5 wt.% graphene nanoplatelet-reinforced aluminum (0.5 wt.% GNPs /Al) composite prepared by powder metallurgy and hot pressing. The microstructure and mechanical properties of hot extruded composite were investigated. The reinforcement effect of hot extrusion on GNPs/Al composite is the synthetic actions of work hardening, dynamic recovery and dynamic recrystallization of matrix grains, and the dispersion, delamination and structure of the GNPs in the composite due to the different fluidity of the matrix at different temperatures. As a result, the comprehensive mechanical properties of the composite extruded at 490 °C are the best. The TEM image exhibits that, at the optimal extrusion temperature of 490 °C, GNPs are uniformly distributed in the aluminum matrix, mainly dispersed at the grain boundaries, where some Al4C3 and Al2O3 exhibit pinning effects to form fine interface between the GNPs and the matrix.
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Research context
OpenAlex topics: Aluminum Alloys Composites Properties · Advanced ceramic materials synthesis · Boron and Carbon Nanomaterials Research
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References (29)
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