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Shumei Lou,Yiming Li,Baojia Cheng,Lingwei Ran,Yue Wang,Leyao Xu,Ben Ma,Chungjian Su,Qingbiao Wang 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.12
A 0.5 wt% GNP/Al composite was prepared by powder metallurgy and hot pressing. The numerical simulations and experimentsof porthole die extrusion were performed at 440 °C, 460 °C, 480 °C and 500 °C. The effect of extrusion temperatureon the microstructure and mechanical properties of the composites was studied. The results showed that the composite nearthe welding zone underwent dynamic recrystallization due to the large strain to form fine grains, some of which grew tocoarse 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 effectson the recrystallization of the grain, fluidity and plasticity of the matrix, determined by the delamination, distribution andstructure of graphene and welding behavior in the welding zone. Therefore, the comprehensive mechanical properties ofthe composite reached the highest values in the extrusion direction and the transverse direction at 460 °C; the TEM imagesshowed that the graphene and aluminum matrix were in contact with each other via a small wavy transition overlapping zoneor that interaction forces caused by welding and shearing allowed the formation of a direct interface with the Al matrix. Thedeformed graphene formed a good interface with the matrix, ensuring outstanding mechanical properties in the welding zone.
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Shumei Lou,Guodong Ren,Hui Zhang,Baojia Cheng,Peng Chen 한국섬유공학회 2022 Fibers and polymers Vol.23 No.11
Carbon fiber composites have excellent properties and can be used in automobile, aircraft, rail transit and otherfields of lightweight, but Its price is very expensive. For reducing the cost and improving the comprehensive properties ofmaterials which contain carbon fiber composites and used in the fields mentioned above, carbon fiber (CF) and glass fiber(GF) were mixed to replace pure carbon fiber composites. Three different methods were used to treat the surface of carbonfiber (ultrasonic surface cleaning, liquid phase oxidation of concentrated nitric acid and ultrasonic combined concentratednitric acid oxidation) and different contents of silane coupling agent KH-550 (0 %, 0.2 %, 0.5 %, 1.0 %) were used to treatthe glass fiber, and the laminated plate was prepared by Vacuum Assisted Resin Transfer Molding (VARTM). The CF/GFhybrid composite laminates were prepared by combining the best surface treatment method and the best stacking scheme ofcarbon fiber and glass fiber. The tests of mechanical properties and the observation of SEM fracture morphology show that,the surface treatment of CF by ultrasonic combined concentrated nitric acid oxidation is the best; mechanical properties of GFreinforced composite were the best when surface treatment was carried out with 0.5 % silane coupling agent; Compared withthe untreated samples, the mechanical properties of CF/GF hybrid composite laminates after surface treatment wereimproved, the thickness and weight are reduced. Thus, the weight reduction and better performances were achieved.
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