The effect of microstructure evolution on the wear behavior of tantalum processed by Indirect Extrusion Angular Pressing

This article studies the evolution of microstructure and wear resistance in tantalum processed by a newly developed Severe Plastic Deformation (SPD) technique called Indirect Extrusion Angular Pressing (IEAP). The tribological behavior nanostructured IEAP were analyzed this work. samples extruded for two, five, twelve passes then exposed to ball-on-disk testing dry sliding conditions. It was shown that after passes, an extensive grain refinement down 500 nm achieved, hardness increased, high dislocation density formed material. material improved successively each pass IEAP, rate decreased, although friction coefficient did not change. Evaluation morphology tracks showed dominant mechanisms comprised galling, adhesive wear, pitting microplowing. Refinement led reduction while slight increase oxidation appeared. Comparison results between against steel balls alumina presence generated larger portion making mechanism more complicated tantalum-steel pair presented milder wear.