Powder metallurgical fabrication of graphene reinforced near-eutectic Al-Si matrix composites: Microstructural, mechanical and electrochemical characterization

Nazlı Akçamlı*, Berk Şenyurt, Hasan Gökçe, Duygu Ağaoğulları

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Al-10 wt% Si matrix composites reinforced with a few-layered graphene (FLG) were fabricated via a powder metallurgical route. FLG in varying amounts (0.25, 0.5, 1, 2, and 5 wt%) was incorporated into the Al-10Si matrix via mechanical alloying (MA) for different durations in a high-energy ball mill. The mechanically alloyed (MAed) powders were consolidated by uniaxial pressing and pressureless sintering processes. The as-blended (non-MAed) and MAed powders and bulk composites were investigated comparatively in terms of microstructural, thermal, mechanical, tribological and corrosion properties. The MAed powders demonstrated refined and semi-equiaxed particle morphology with reduced crystallite size values. Additionally, the FLG/Al10Si composites exhibited advanced microstructural and mechanical properties by the contribution of MA and reinforcing particles compared to those of the as-blended and unreinforced matrix. The highest hardness and lowest wear rate values were obtained for the 4 h-MAed Al10Si-2FLG (138 HV and 6.485x10-4 mm3/N.m) and Al10Si-5FLG (178 HV and 7.456x10-4 mm3/N.m) composites. Moreover, the compressive strength of the Al-10Si matrix improved approximately by 50 and 20% via 0.5 and 2 wt% FLG addition, respectively. Also, lower corrosion resistance properties were observed for the FLG reinforced composites compared to the Al10Si matrix.

Original languageEnglish
Article number101052
JournalEngineering Science and Technology, an International Journal
Volume31
DOIs
Publication statusPublished - Jul 2022

Bibliographical note

Publisher Copyright:
© 2021 Karabuk University

Funding

This study was financially supported by “The Scientific and Technological Research Council of Turkey ( TÜBİTAK )” with the project number of 118M185 . The authors wish to express their appreciation to Prof. Dr. Lütfi Öveçoğlu for his advising and support.

FundersFunder number
TÜBİTAK
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu118M185

    Keywords

    • Al-Si alloy composites
    • Corrosion resistance
    • Few-layered graphene (FLG)
    • Mechanical/microstructural properties

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