The Effect of Graphene Additives on the Structure and Properties of Aluminum

Effect of Grain Size on the Properties of Aluminum Matrix Composites with Graphene

“…According to [34,35], the ratio of the I 2D /I G and I D /I G peaks in the corresponding spectra indicated that the synthesis of the aluminum matrix composites yielded nanosheets of multilayer graphene varying in thickness and deficiency. Carbon inclusions in the AlGr composite synthesized from a glucose precursor could be described as defectless, three-layer graphene [30], while in the case of the AlMgGr composite with the ascorbic acid precursor, such inclusions presented double-layer graphene with defects in the structure. The synthesis of the AlMnGr composite with the boron carbide precursor yielded a double-layer, defectless graphene.…”

“…They resided mainly along the grain boundaries or inside the Al matrix grains, but in the alloyed composites, they were also found on the fragments of the brittle intermetallic crystals. Thus, the TEM images of the AlGr composite showed irregularly faceted structural elements (Figure 6a) that, according to the dark-field images (Figure 6b) and the analysis of the direct images of the crystal structure (Figure 6c,d, [30]), could be identified as graphenenanoplatelets.…”

“…Unfortunately, the available experimental data about the correlation between the structure of composites and their mechanical strengths are insufficient, and the available results are rather contradictory [29]. Initial studies of the structure formation of in sit composites based on aluminum and graphene have demonstrated both the positive effect of graphene as a reinforcing agent of aluminum matrix composites with disperse structure and the absence of reinforcement in the coarse-grained state [30,31].…”

Structure formation and physical-mechanical properties of Al-Mg alloy with microadditions of graphene

“…Figures 6 a, 6 b contain bright-field and dark-field images of the dispersed subgrain structure with a high dislocation density in the volume of the subgrains which confirms SEM data. The arrangement of graphene nanofilms in the Al matrix has been studied in detail in the investigations of AlGr composites and it has been proved using TEM data that they are bent and partially fragmented during deformation, located along the grain boundaries [17,18].…”

“…According to [13 -16], in-situ synthesis in a molten metal matrix layer under molten salts is an efficient technique for producing graphene-and diamond-reinforced aluminum matrix composites. Thus, the produced aluminum matrix composites containing 0.10 -0.13 % graphene exhibit enhanced mechanical properties both in the as-cast [17] and in the deformed state [18].…”