Towards understanding the machinability improvement of high-entropy alloys via ultra-precision diamond cutting technology in a magnetic field environment

Currently, high-entropy alloys (HEAs) have played a pivotal role in numerous fields because of their exceptional physical and chemical properties. However, complex composition of various elemental and the incomplete understanding of manufacturing mechanisms make it challenging to achieve ultraprecision surface formation using traditional processing methods. Therefore, this study proposes ultra-precision diamond cutting in magnetic field environment to enhance the nanometer-precision surface integrity of HEAs. Furthermore, phenomenological features are discussed and analyzed using advanced characterization techniques, ranging from macroscopic surface morphology to microscopic subsurface structure, to achieve a deeper understanding for material removal process. The generation mechanism of ultraprecision surfaces is thoroughly investigated by studying changes in surface, subsurface, chip, and tool wear with and without external magnetic field excitation. This study demonstrates that the ultra-precision surface integrity of HEA workpieces is enhanced due to changes in the workpiece material during machining when a magnetic field is applied, leading to significantly improved machinability. This work provides a promising manufacturing technology for improving ultraprecision surface quality in advanced materials, aiming to meet future application requirements across various fields.