Critical wear assessment of AA8011/Hybrid metal matrix composites with surface amendment using Friction Stir process 2019-28-0096
Friction Stir Process (FSP) was used for surface modification of steel, titanium, aluminum and magnesium based alloy has been considerably reviewed during the last decade. FSP can improve surface properties such as abrasion resistance, hardness, strength, ductility, corrosion resistance, fatigue life and formability without affecting the bulk properties of the material. The aluminum alloy having low ductility and softness characteristics are restricted because of their poor tribological properties. Preliminary studies reveal that, an ideal circumstance is to improve the aluminum alloy material life cycles by the way of strengthening the surface layer which can be modified through reinforcing nano particles through FSP. By the way, this experiment was carried out to obtain three set of samples like virgin AA8011, AA8011 with shape memory alloy and AA8011 along with shape memory alloy and silicon nitride during FSP under optimal process parametric condition. The improved distributions of nanoparticles were obtained after each FSP pass and progress in mechanical properties was observed. On the other hand to assess the tribological performance of prepared hard surface, three samples were taken for tribo meter test. During this study the influenced process parameters were varied out with 10,20,30,40 N of load and 1000,2000,3000 m sliding distance and responses were calculated on wear rate and co-efficient of friction. The wear rate and coefficient of friction for alloy, composite and hybrid composite decreased with increase in sliding distance. Further increase of applied load the wear rate increased and coefficient of friction decreased. Hybrid composites of AA8011 along with shape memory alloy and silicon nitride specimen have shown significant tribological outcome than other samples. The worn surface of the hybrid composites also detailed using scanning electron microscope. This hybrid FSP sample makes them as reliable alternate material for aerospace and automotive application in tribological areas.