Investigation of Unlubricated Sliding Wear Behaviours of In-Situ AlB₂/Al Metal Matrix Composite

Abstract

In this study, wear behaviour of AlB 2 /Al composite materials produced through in-situ method have been experimentally investigated. Four different composite materials that include 5wt.%, 10wt.%, 20wt.% and 30wt.% AlB 2 reinforcement phase were tested using pin-on-disk arrangement. The effects of the rate of reinforcement on wear and friction behaviours have been investigated. Wear tests are carried out at 1.83, 3.40 and 4.71 m/s sliding speeds under 10, 20 and 40 N applied loads. The test results show that wear rate increases with the increase in applied load and sliding distance. Increasing the rate of reinforcement phase in the matrix has proportionally increased the wear resistance by 3% to 30%. Hence the greatest wear resistance has been observed with the composite materials having 30wt. % AlB 2 reinforcement. Analysis of the worn surfaces of composite samples shows that abrasive and adhesive wear mechanisms are more effective.

Production of Functionally Graded AlB2/Al-4%Mg Composite by Centrifugal Casting

“…These results show that the hardness of Al-Mg alloys were significantly increased by the addition of 10 % of AlB2 flake. This result is in good agreement in a number of experimental works reported for AlB2/Al type composites [9,15,[18][19][20][21][22].…”

“…AlB2 flakes in liquid aluminium alloys can be precipitated during solidification. [14][15][16][17]. Thus, the reinforcement phase (AlB2 flakes) can readily be produced by in-situ fabrication techniques.…”

Application of Taguchi Method to Investigate the Effect of Some Factors on In-Situ Formed Flake Structures of AL/ALB2 Composite

“…The samples were ground and polished following the usual metallographic techniques. The formation of boride phase in the form of flakes within the matrix was achieved and confirmed to be AlB2 in a parallel work presented elsewhere [11,19]. The present work was concentrated on the effects of some process parameters on the size of the flakes, the measurements were performed on the polished surface of the samples.…”

Experimental optimization of dry sliding wear behavior of in situ AlB2/Al composite based on Taguchi’s method

“…The test was carried out by applying normal loads of 10, 20, and 40 N and run for different sliding distances of 500, 1000 and 2000 m at three different sliding velocities of 1.83, 3.40, and 4.71 m/s. The disc material was made of AISI 4140 steel with a hardness of 56 HR C [34].…”