OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 27 No. 3 2025 Fig. 1. Preparation of Al7075 specimens with varying reinforcements by stir casting ensure sound cast specimens. Specimens with a diameter of 20 mm and a length of 250 mm were obtained. The mold was preheated for 5‑7 minutes prior to pouring the molten metal to facilitate deoxidation. The chemical composition of Al7075 is presented in Table 1. Table 2 describes the different specimens prepared with varying reinforcements using stir casting. Hardness was measured using a Brinell hardness tester according to ASTM E10. A load of 187.50 kg was applied to the specimen using a 2.5 mm steel ball indenter for a dwell time of 20 seconds. To assess the uniform distribution of hybrid reinforcements, hardness values were measured at two different locations on the cast specimen. Tensile behavior of the nanocomposites was investigated by manufacturing and testing specimens in accordance with ASTM B557. Before testing in the UTM, the test specimen was machined according to the standard. Ta b l e 1 Chemical composition of Al7075-T6 alloy Element Si Fe Cu Mn Mg Cr Ni Zn Ti Zr Al wt.% 0.10 0.23 1.48 0.07 2.11 0.22 0.01 5.29 0.07 0.02 Balance Ta b l e 2 Al7075 nanocomposites prepared with varying reinforcements Specimen Reinforcement S1 Unreinforced Al7075 alloy S2 Al7075 + 0.5% SiC + 0.1 % graphene S3 Al7075 + 0.5% SiC + 0.2 % graphene S4 Al7075 + 0.5% SiC + 0.3 % graphene S5 Al7075 + 0.5% graphene + 1 % SiC S6 Al7075 + 0.5% graphene + 2 % SiC S7 Al7075 + 0.5% graphene + 3 % SiC S8 Al7075 + 1 % graphene + 2 % SiC S9 Al7075 + 1 % graphene + 4 % SiC
RkJQdWJsaXNoZXIy MTk0ODM1