Mechanical and wear behavior of AA7075 aluminum matrix composites reinforced by Al₂O₃nanoparticles

Abstract

An attempt was made to synthesize aluminum alloy (AA) 7075 matrix reinforced with 0, 1, 3, 5 wt% Al 2 O 3 particulates by using stir casting technique. Mechanical properties and wear behavior were examined. The hardness and tensile properties were obtained before and after addition of Al 2 O 3 particulates to reveal the extent improvement. Wear behavior was examined by using a pin-on-disc device to validate the improvement of the wear resistance. The results showed that adding of Al 2 O 3 reinforcement were significantly enhanced the mechanical properties. The ultimate tensile strength (UTS) and yield tensile strength (YTS) were observed 133 MPa, 35 MPa for the unfilled aluminum matrix, whereas 152 MPa and 47 MPA were achieved at 5 wt% Al 2 O 3 nanocomposites which resulted in 14.3 and 34.3% improvement, respectively. The hardness was observed 57 BHN and 72 BHN at 0 wt% and 5 wt% Al 2 O 3 respectively, resulting in an improvement of 26.3%.

Wear Dry Behavior of the Al-6061-Al2O3 Composite Synthesized by Mechanical Alloying

“…However, other authors reported an increase in the mechanical performance of aluminum alloys manufactured by forging or casting with more modest concentrations (5% by volume), finding an increase in wear resistance and mechanical properties (ultimate tensile strength and yield strength), of 14.3%, 34.3%, and 26.3% respectively, concerning the reference alloy. These results, reported by Al-Salihi et al [14], were obtained in an A7075 alloy manufactured by stir casting.…”

Study on Micro - Nano Sized Al2O3 Particles on Mechanical, Wear and Fracture Behavior of Al7075 Metal Matrix Composites

“…It is known that the addition of Al2O3 nano particulates into the base material provides better heterogeneous nucleation at the time of solidification resulting in refined grains. Therefore, the improvement of the tensile strength can be ascribed to the grain size [12]. Other researchers suggested that the different strengthening mechanisms for the MMCs like load sharing, grain refinement, particulate strengthening and thermal mismatch strengthening were caused by nano-particulates.…”

“…% of nano-sized Al 2 O 3 particulates in the matrix. Huda et al [12] developed Al7075 composite reinforced by 0 -5 wt. % of Al2O3 particulates by using stir-casting technique.…”

Enhanced Mechanical and Fatigue Properties In AA5052 Via TiO_2 Nanoparticles Addition Sintering Temperature (ST)

“…The above improvements may be coming from the existence in the matrix of hard TiO 2 particles and the low degree of porosity and uniform distribution of the nano particles. The introduction of TiO 2 nanoparticles into the aluminum matrix is believed to provide some heterogeneous nucleation sites during solicitation resulting in refined grains [22,23] and the sintering temperature, which leads to high dislocation and this will reduce the grain size.…”