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Published in: Metals and Materials International 12/2023

08-06-2023

Effects of Extrusion Temperature on the Properties of a 0.5 wt% GNP/Al Composite in Porthole Die Extrusion

Authors: Shumei Lou, Yiming Li, Baojia Cheng, Lingwei Ran, Yue Wang, Leyao Xu, Ben Ma, Chungjian Su, Qingbiao Wang

Published in: Metals and Materials International | Issue 12/2023

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Abstract

A 0.5 wt% GNP/Al composite was prepared by powder metallurgy and hot pressing. The numerical simulations and experiments of porthole die extrusion were performed at 440 °C, 460 °C, 480 °C and 500 °C. The effect of extrusion temperature on the microstructure and mechanical properties of the composites was studied. The results showed that the composite near the welding zone underwent dynamic recrystallization due to the large strain to form fine grains, some of which grew to coarse grains because of the local high temperature. The extrusion temperature influenced the properties of the 0.5 wt% GNP/Al composite along both the extrusion and transverse directions. This influence is combined with synergistic effects on the recrystallization of the grain, fluidity and plasticity of the matrix, determined by the delamination, distribution and structure of graphene and welding behavior in the welding zone. Therefore, the comprehensive mechanical properties of the composite reached the highest values in the extrusion direction and the transverse direction at 460 °C; the TEM images showed that the graphene and aluminum matrix were in contact with each other via a small wavy transition overlapping zone or that interaction forces caused by welding and shearing allowed the formation of a direct interface with the Al matrix. The deformed graphene formed a good interface with the matrix, ensuring outstanding mechanical properties in the welding zone.

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Literature
Metadata
Title
Effects of Extrusion Temperature on the Properties of a 0.5 wt% GNP/Al Composite in Porthole Die Extrusion
Authors
Shumei Lou
Yiming Li
Baojia Cheng
Lingwei Ran
Yue Wang
Leyao Xu
Ben Ma
Chungjian Su
Qingbiao Wang
Publication date
08-06-2023
Publisher
The Korean Institute of Metals and Materials
Published in
Metals and Materials International / Issue 12/2023
Print ISSN: 1598-9623
Electronic ISSN: 2005-4149
DOI
https://doi.org/10.1007/s12540-023-01471-1

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