The Effect of B4C Amount on Wear Behaviors of Al-Graphite/B4C Hybrid Composites Produced by Mechanical Alloying

Abstract

In this study, wear behavior of composite materials produced by mechanical alloying method adding different amounts of B 4 C in the Al-Gr matrix were investigated. After adding 2% (vol.) graphite to the aluminum matrix, 3 different amounts (3%, 6% and 9%) of B 4 C were added. The composite powders prepared were mechanically alloyed for 60 minutes. The milled powders were cold-pressed under 700 MPa pressure. The green compacts produced were sintered at 600 °C for 120 minutes. The sintered B 4 C reinforced aluminum composite materials were characterized by the Scanning Electron Microscope, X-ray diffraction, and hardness and density measurements. Wear tests were performed on a standard pin-on-disc wear testing device with a load of 20 N at a sliding speed of 0.5 ms -1 and four different sliding distances (between 250-1000 m) according to ASTM G99 standard. As a result of the studies, the hardness increases as the amount of B 4 C in the composite material increases, while the density of AMC decreases. As a result of the wear tests, the highest weight loss was obtained in the non-reinforced Al-Gr matrix alloy, while the lowest weight loss was obtained in 9% B 4 C reinforced composite materials. However, it was observed that there was a decrease in the friction coefficient with increasing amount of reinforcement.

Multi Ceramic Particles Inclusion in the Aluminium Matrix and Wear Characterization through Experimental and Response Surface-Artificial Neural Networks

“…Wear arose through the delamination process, as the strengthening particles were stripped from the surface, as seen in Figure 8 d–f. In addition, for Sample S1, the SEM micrograph displayed long deformation bands, a strong sign of delamination wear [ 35 ]. The surface of Sample S1 revealed deeper grooves and less plastic flow, which are direct signs of improved wear resistance, as seen in Figure 8 g–i.…”

“…Therefore, Al2219 was chosen as the matrix material, and its chemical composition is shown in Table 1 . Among the ceramics, B 4 C has excellent wettability with the Al matrix because of the formation of the B 2 O 3 layer during solidification [ 35 ]. It has an incredibly high neutron absorption capacity and belongs to the lightweight (2.52 g/cm 3 ) ceramic material group.…”

INVESTIGATION OF MICROSTRUCTURE AND HARDNESS PROPERTIES OF AGED AA 7075 MATRIX B4C / SiC REINFORCED COMPOSITE-HYBRID MATERIALS

“…In the B 4 C and SiC reinforced composite material microstructures given in Figures 5 and 6, it was determined that based on the increased reinforcement rate, ceramic phases showed distribution mostly on the grain boundary and in the areas close to the grain boundary (Figures 5 and 6-e-f). In a study conducted by Şimsek, it is stated that the B 4 C particles added to the matrix get a position at the grain boundaries [17]. It can be stated that depending on the increased amount of reinforcement, B 4 C and SiC ceramic phase particles of different sizes and distributions exhibit homogeneous distribution on the matrix structure.…”

Effect of Boron Carbide on wear resistance of graphite containing Al7029 Based Hybrid Composites and its Dry Sliding Wear Characterization Through Experimental, Response Surface Method and ANOVA

“…The presence of graphite is indicated by an X-ray intensity peak of 26°, 54 0 . B4C particles have an X-ray intensity of 23°, 36 0 [23][24].…”