Comparison of the Effects of Surface Roughness of Wrought Aluminium Alloys on the Surface of Steel
The effect of roughness of wrought aluminium alloys on the surface of steel is investigated. Roughness average (Ra) was a fixed polishing at 14 ± 0.05 μm. Also was using a pin–on disc, made of AISI 1045 steel and Ra=0.15 ± 0.05 μm, Hv=312 ± 20 kg/mm2. All tests were carried out as per ASTM G-99 standard. The angular speed of the disc was a fixed 200 rpm and a load range of (5, 10, 15) N, and relative humidity 65%. The microstructure for samples and worn surfaces were analyzed and characterized using X-ray diffraction the residual voltage (XRD), energy dispersive spectroscopy (EDS), scanning of electron microscopy (SEM) and atomic force microscopy (AFM), respectively. It was noticed that the dry sliding wear of aluminium alloys against a steel counterface resulted in severe wear for all alloys. At a load of 10 and 15 N, performs a better effect of wear resistance of A 6092 alloy and was wear reduction is 18% comparison with A5056 and A 3003 alloys and reduce friction. However, at a heavy load of 15 N, only the pattern can effectively reduce friction. The maximum reduction rate of the average wear depth is 20% of A 6092 alloy while a reduce 29% and 40% in A5056 and A3003 alloys respectively. However, there was correlation between roughness and wear rate. In all cases, a mechanically mixed layer was formed. Deformation below worn surface and wear resistance is discussed.
Riyadh A Badr