Influence of Fly Ash Particles on Surface Roughness and Friction Coefficient of Magnesium Metal Composites

Author (s):

  1. R. S. Fono-Tamo, Papua New Guinea University of Technology, Lae,


Surfaces of magnesium metal composites (MMC) with fly ash (FA) particles embedment processed through friction stir processing (FSP) was subjected to friction and roughness test. The friction stir processing development was done with 3 passes at 1200 rpm. The investigation was conducted via a profilometer dotted with a diamond stylus at a speed of 0.2 mm/s for the surface roughness test. The sliding friction test was carried out using a pin-on-disk tribometer under varying load condition. The coefficient of friction (COF) was investigated under 1 and 10 N loads at a constant speed at 70% humidity. A digital Vickers Hardness tester helped find the hardness at various locations of the processed surface. The determined surface roughness parameters are Ra = 3.21µm, Rz = 18.47 µm and Rmax = 22.45µm. There is a regular increase in hardness from the beginning to the end of the process with average values as 69.34, 71.44 and 74.03 for the beginning, middle and end of the work piece respectively. The coefficient of friction varies considerably with the applied load. For each load, there is a fluctuation at the early stage of the experiment before a seeming stability of the coefficient of friction is observed. The derived COF are 0.82925 and 0.27459 for 1 and 10 N loads respectively. It is shown that including fly ash particles into magnesium substrate affects the initial structure of the based metal.

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