A. Islam Ahad, B. Baskar, A. Huang, E.J. Lavernia, G. Aguilar
Texas A&M University, Texas, United States
Keywords: LIPSS, surface nanostructures, RHEA, oxidation resistance, surface hardness
Corrosion and surface abrasion are pervasive challenges that degrade material integrity, leading to costly maintenance and premature failure especially in extreme environments. To address these, we aim to enhance the intrinsic properties of Refractory High-Entropy Alloys (RHEAs), a novel class of material systems known for their exceptional mechanical properties and high-temperature stability, by introducing Laser-Induced Periodic Surface Structures (LIPSS). This study is among the first to explore the potential of LIPSS to create surface nanopatterns and a gradient nanostructure by inducing microstructural changes, potentially improving oxidation resistance, wear resistance, and surface hardness. LIPSS is a rapid and cost-effective technique that uses laser processing to create nanoscale patterns on the material's surface, leading to enhanced surface properties. Advanced microscopy techniques will be conducted to examine surface morphology, quantify roughness, and investigate the depth, grain refinement, phase stability induced by LIPSS. This research seeks to develop an alternative method for modifying RHEAs to improved oxidation resistance, surface hardness, and wear resistance, as opposed to the conventional protective measures, like coatings, and paving the way for more durable, high-performance materials in demanding environments.