Synthesis of High Entropy Alloy for Surface Modification by Friction Stir Process: Recent Advances and Future Directions

High Entropy Alloys (HEAs) certainly stand out lately because of their uncommon mechanical properties and possible applications in different fields. Friction Stir Processing (FSP), a solid-state processing technique, has been displayed to upgrade the microstructure and mechanical properties of HEAs. This review article sums up the present status of-the-specialty of FSP applied to HEAs. The microstructural development and the processing parameters of FSP-treated HEAs are discussed and reviewed. The impacts of FSP on the grain structure, texture, and phase distribution of HEAs are featured. Moreover, the impact of FSP on the mechanical properties, like ultimate tensile strength, yield strength, microhardness, tribological behaviour, and corrosion properties of HEAs and HEA-reinforced metals is explored. Finally, possible applications and the difficulties and future headings of FSP applied to HEAs are examined. The review aims to give an outline of the recent progressions in the FSP of HEAs and inspire further research in this field.