Reciprocating sliding wear properties of sintered Al-B4C composites
18 September 2020
Revised: 11 December 2020
Accepted: 22 December 2020
Available online: 29 December 2020
Abstract: Pure aluminum and boron carbide reinforced aluminum matrix composites with various content (1, 6, 15, 30 wt.%B4C) were fabricated using the powder metallurgy technique. The influence of boron carbide amount on the mechanical and tribological behavior of sintered Al-B4C was examined. The highest density (~2.54 g/cm3), lowest porosity (4%), maximum Vickers hardness (~75 HV), as well as, lowest weight loss (0.4 mg), and lowest specific wear rate (0.00042 mm3/Nm) under a 7 N load were obtained with Al-30B4C composites. Enhancement of 167% in hardness, a decrease of 75.8% in weight loss, and a decrease of 76.7% in specific wear rate under an applied load of 7 N were determined when compared with pure aluminum. Similarly, the SEM images of the worn surface revealed that the narrowest wear grove (0.85 mm) at a load of 7 N was detected at Al-B4C composite and the main wear mechanism was observed as an abrasive wear mechanism. According to the friction analysis, the coefficient of friction between surfaces increased with increasing boron carbide content and decreasing the applied load. In conclusion, boron carbide is an effective reinforcement material in terms of tribological and mechanical performance of Al-B4C composites.