The effect of graphene-nanosheets (GNs) on the mechanical properties and microstructure of the S390 HSS alloy was investigated. The S390 HSS sample reinforced with 0.25, 0.5, and 0.75 wt.% GNS. Powder metallurgy technique was used to prepare all samples. The elemental powders of the alloy were milled in a planetary ball mill by 10:1 ball to powder ratio with speed 350 rpm for 48 hours, and the mixed powders were warm compacted by the uni-axial press at 550 ⁰ C under 500 MPa and then sintered in a vacuum furnace at 1370 • C for 1 hour. X-ray diffraction shows the formation of secondary carbide phases and martensite. The density result indicates the decreasing of density values by GNS additions. The mechanical properties show an increase in the hardness and wear resistance by increasing the graphene content. The specimens are metallographically examining using Scanning Electron Microscopy (SEM), and also the electron backscatter diffraction shows a good distribution of GNS in the HSS matrix.
Ti-12Mo/ZrO2 nanocomposites are fabricated using the powder metallurgy technique for the potential of aerospace applications. Titanium-12 wt. % molybdenum metal matrix composite containing various percentages of ZrO2 (5, 10, and 15 wt. %) are prepared. The phase composition and microstructure of Ti-12Mo/ZrO2 powder, as well as the consolidated composites), are investigated by both X-ray diffraction and scanning electron microscope (SEM) equipped with an energy dispersive spectrometer (EDS) respectively. All the consolidated composites are characterized by measuring the density, Vickers hardness, and wear rate. XRD refers to no new phase are formed between Ti, Mo, and ZrO2 during the sintering process. Also, a good microstructure is achieved. Results indicated that the density of the sintered composites is increased with increasing ZrO2 percent up to 5 wt. %. On the other hand, the highest hardness and highest wear resistance are achieved for 5 wt. % ZrO2 sample. The present work demonstrated that Ti-12Mo/ZrO2 composites have a high potential for aerospace applications.
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