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


Akçamlı N., Şenyurt B., Gökçe H. , Ağaoğulları D.

Engineering Science and Technology, an International Journal, vol.31, 2022 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 31
  • Publication Date: 2022
  • Doi Number: 10.1016/j.jestch.2021.08.009
  • Title of Journal : Engineering Science and Technology, an International Journal
  • Keywords: Al-Si alloy composites, Few-layered graphene (FLG), <p>Mechanical/microstructural properties</p>, Corrosion resistance, TRIBOLOGICAL BEHAVIOR, TENSILE PROPERTIES, METAL, NANOPLATELETS, STRENGTH, NANOCOMPOSITES, AL6061, CARBON, WEAR, GNPS

Abstract

© 2021 Karabuk UniversityAl-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.