TY - JOUR

T1 - Fabrication of nickel-graphene composites with superior hardness

AU - Kurapova, Olga Yu

AU - Lomakin, Ivan V.

AU - Sergeev, Semen N.

AU - Solovyeva, Elena N.

AU - Zhilyaev, Alexander P.

AU - Archakov, Ivan Yu

AU - Konakov, Vladimir G.

PY - 2020/9/15

Y1 - 2020/9/15

N2 - Bulk nickel-graphene (Ni-Gr) composites are in the high demand for most of the engineering applications. Despite many efforts made, the main problem remains the homogeneous dispersion of graphene into the Ni matrix without destroying the structural integrity of Gr. The present paper addresses the fabrication, structural features and mechanical characteristics of bulk Ni-Gr composites, manufactured from nanosized nickel powder and exfoliated graphite platelets (GP) via modified powder metallurgy procedure including micromechanical GP splitting. The combination of XRD, SEM, Raman spectroscopy and EBSD analysis revealed homogeneous distribution of Gr in Ni matrix and the significant grain refinement observed for Ni-0.1 wt% Gr composite. Bimodal grain size distributions were obtained for all samples studied, and the mean grain size depends on Gr content. Raman spectroscopy proved the complete GP-to-graphene conversion for composite with 0.1 wt% Gr. Bulk nickel specimen and composites exhibit ∼3 times higher hardness and moderate tensile strength values compared to Ni, manufactured from micron-sized powders.

AB - Bulk nickel-graphene (Ni-Gr) composites are in the high demand for most of the engineering applications. Despite many efforts made, the main problem remains the homogeneous dispersion of graphene into the Ni matrix without destroying the structural integrity of Gr. The present paper addresses the fabrication, structural features and mechanical characteristics of bulk Ni-Gr composites, manufactured from nanosized nickel powder and exfoliated graphite platelets (GP) via modified powder metallurgy procedure including micromechanical GP splitting. The combination of XRD, SEM, Raman spectroscopy and EBSD analysis revealed homogeneous distribution of Gr in Ni matrix and the significant grain refinement observed for Ni-0.1 wt% Gr composite. Bimodal grain size distributions were obtained for all samples studied, and the mean grain size depends on Gr content. Raman spectroscopy proved the complete GP-to-graphene conversion for composite with 0.1 wt% Gr. Bulk nickel specimen and composites exhibit ∼3 times higher hardness and moderate tensile strength values compared to Ni, manufactured from micron-sized powders.

KW - Graphene

KW - Hardness

KW - Interface

KW - Nickel-matrix composites

KW - NANOCOMPOSITES

KW - RAMAN-SPECTROSCOPY

KW - STRENGTH

KW - ALUMINUM-GRAPHENE

KW - DUCTILITY

KW - MECHANICAL-PROPERTIES

KW - MATRIX COMPOSITES

UR - http://www.scopus.com/inward/record.url?scp=85084260702&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/58d6eafa-7c01-37f5-b918-6e3d58271727/

U2 - 10.1016/j.jallcom.2020.155463

DO - 10.1016/j.jallcom.2020.155463

M3 - Article

AN - SCOPUS:85084260702

VL - 835

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

M1 - 155463

ER -