The impact of microstructural refinement on the tribological behavior of niobium processed by Indirect Extrusion Angular Pressing

This research, for the first time, conducted a comprehensive study into effect of modern Severe Plastic Deformation technique, “Indirect Extrusion Angular Pressing (IEAP)”, on microstructural refinement niobium and subsequent impact tribological properties. The samples were processed 4, 9, 12 passes IEAP then exposed to Pin-on-disk wear test in dry sliding conditions. results showed that grain occurred from an average size 13 μm 0.5 μm, along with increase hardness initial value 79 HV 180 after passes. Results tests revealed processing reduced width, volume loss, specific rate by 14%, 38%, respectively, thereby enhancing resistance material. Evaluation morphology tracks demonstrated less spalling fatigue propagated cracks as well finer detachment debris surface samples, which led producing mild regime. outcomes suggested resulted higher against abrasion development respectively associated larger fractions high-angle boundaries (HAGBs).