NANOSTRUCTURAL COMPOSITE MATERIAL MODIFIED WITH GRAPHENE-LIKE PARTICLES
Abstract
In the framework of this research, comprehensive studies of nanostructured composite materials modified by graphene-like structures formed under conditions of joint mechanoalloying of the initial matrix aluminum alloy AD0 and flaky graphite have been carried out. To obtain powder mixtures with a low content of graphite, stearic acid was used as a milling agent, the use of which made it possible to reduce the average crystallite size by 15-20% and reduce the size of aggregates by 20-30% compared to the samples without a milling agent. Mechanically alloyed powder mixtures were sintered by the method of direct hot extrusion at a temperature of 280-300 °C, with a strain rate of 6.2. It was found that in the process of mechanical alloying, graphite degrades to graphene-like structures, consisting of 5-12 graphene layers with an average size of less than 20 nm. It was established by TEM and SEM that during mechanical alloying and extrusion, the formation of aluminum carbide Al4C3 does not occur. Nevertheless, quantumchemical modeling of the aluminum-graphene system showed that the formation of a chemical bond between graphene and aluminum is possible and energetically favorable. Based on the calculations performed, it was found that the value of the shear modulus for the graphene / Al (100) system varies from 20 to 50 MPa (for the armchair configuration AC and zigzag ZZ, respectively), and in the case of graphene / Al (111) from 20 to 70 MPa. The experimental data are consistent with the simulation results. As a result of the modification of the aluminum matrix with graphene-like particles, an increase in the conventional yield stress and hardness up to 525 MPa and hardness up to 167 HV, respectively, is observed.
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