Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (11): 3575-3582.doi: 10.13229/j.cnki.jdxbgxb.202402147

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Effect of extrusion temperature on the microstructure and mechanical properties of longitudinal weld in a porthole die extruded GNP/7075Al composite

Shu-mei LOU(),Le ZHOU,Peng CHEN,An-bo DU,Hao ZHAO,Yu MIAO   

  1. College of Intelligent Equipment，Shandong University of Science and Technology，Taian 271019，China
  • Received:2024-03-11 Online:2025-11-01 Published:2026-02-03

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Abstract:

The effects of extrusion temperature on the microstructure and mechanical properties of longitudinal welds in aluminum matrix composites were investigated using graphene-reinforced 7075 aluminum matrix composites （GNP/7075Al） to enhance the welding quality during shunt die extrusion process.The results show that with the increase of extrusion temperature， the diffusion rate of metal atoms increases， the coarse second phases are obviously reduced， and more second phase particles are gradually dissolved into the aluminum matrix as well as the longitudinal weld. Appropriately increasing the extrusion temperature is conducive to forming a good welding interface and improving the quality of longitudinal weld. However， if the temperature is too high， the soft processes for the matrix such as dynamic recrystallization will decrease the deforming hardening of the extrusion， the weld pressure decrease， and the structure integrity of the graphene will be destroyed， decreasing the properties of the extrudate. At the extrusion temperature of 480℃， the welding line is the narrowest and the weld property is the best. Moderate dynamic recrystallization， solid solution strengthening of the matrix and the best state of the enhanced phase graphene brought the best weld quality and comprehensive mechanical properties of the extrudate with the tensile strength of 279.98 MPa.

Key words: composites, porthole die extrusion, extrusion temperature, microstructure, mechanical property

CLC Number: 

  • TG376.2

Fig.1

Schematic diagram of welding in the porthole die extrusion and sampling of tensile specimen"

Fig.2

Metallographic diagram of extrudate with different extrusion temperatures"

Fig.3

SEM images of the porthole die extrudate with different extrusion temperatures"

Fig.4

EDS diagram of the second phases of the extrudate"

Fig.5

XRD characterization of the extrudate according to different extrusion temperature"

Fig.6

Engineering stress-strain curves and tensile properties at different extrusion temperatures"

Fig.7

Microhardness distribution of products at different extrusion temperatures"

Fig. 8

Tensile fractographies of the extrudate accord- ing to different extrusion temperatures"

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