CC-BYNedeljković, MilanMladenović, SrbaĆosović, VladanMarković, IvanaPetrović, JasminaStamenković, UrošMitrović, MilijanaKovačević, Avram2025-06-252025-06-252025978-86-81656-84-6https://repozitorijum.tfbor.bg.ac.rs/handle/123456789/5977In this research, the effect of graphene nanosheets (GNS) on the thermal conductivity of Sn-0.7Cu-xGNS (x= 0, 0.02, 0.04, 0.06, 0.08 and 0.1 wt.%) nanocomposite materials was investigated. The GNS were successfully incorporated into the matrix alloy using the powder metallurgy technique, which includes mixing and mechanical alloying, cold compacting and sintering. Thermal diffusivity was measured at room temperature in an inert protective atmosphere using the xenon-flash method. The Sn-0.7Cu matrix alloy has a thermal conductivity of 53 Wm⁻¹K⁻¹ [1], while GNS exhibit a significantly higher value of 5000 Wm⁻¹K⁻¹ [2]. Therefore, it can be predicted that adding GNS will enhance thermal conductivity. However, the situation becomes more complex with composite materials [3]. The obtained value for thermal conductivity of the matrix alloy is 28.42 Wm⁻¹K⁻¹, while the composite with a 0.08 %GNS has the highest thermal conductivity of 35.29 Wm⁻¹K⁻¹. However, as the GNS content further increases, the thermal conductivity decreases. The decrease in thermal conductivity can be attributed to the agglomeration of GNS along the grain boundaries. This agglomeration leads to the accumulation of dislocations, which distort the matrix lattice, increasing the probability of electron scattering. As a result, the number of effective electrons (as heat carriers) in the crystal is reduced, which raises resistance and decreases thermal conductivity. The results indicated that the incorporated GNS enhanced the thermal conductivity of the matrix alloy to a certain extent.enconferenceObject