## 1 Introduction
When the cutting speed reached 140 m/min or the feed rate reached 0.14 mm/tooth, vibrations were generated during the machining process which potentially caused a sharp deterioration in surface morphology. [PERSON] et al. [9] conducted micro-milling experiments on FeCoNiCrMn HEA and established a minimum cutting thickness prediction model based on the effective front angle of the tool. Milling parameters were substituted into the prediction model to calculate the minimum cutting thickness of FeCoNiCrMn HEA, and the accuracy of the prediction model was verified through the analysis of micro-milling force and specific cutting energy. The results showed that when the cutting edge radius of the milling tool was 5 \(\upmu\)m, the predicted minimum cutting thickness of the HEA was calculated to be 1.367 \(\upmu\)m. The variation t trends of micro-milling force and specific cutting energy determined that the minimum cutting thickness range was between 1 \(\upmu\)m and 1.5 \(\upmu\)m, thereby confirming the accuracy of the minimum cutting thickness prediction model. [PERSON] et al. [10] investigated the cutting performance and chip morphology of WNbMoTaZr\({}_{0.5}\) refractory HEA (RHEA). Turning experiments were conducted using PVD-Al\({}_{2}\)O\({}_{3}\) + TiCN-coated tungsten carbide tools on three different alloys: WNbMoTaZr\({}_{0.5}\) RHEA, Cr12 MoV die steel, and GCr15 bearing steel. The study analyzed the effects of cutting speed, depth of cut, feed rate, and tool nose radius on cutting force, surface quality, and chip morphology under dry conditions. The results showed that WNbMoTaZr\({}_{0.5}\) RHEA demonstrated excellent thermal stability and high hardness compared to the other two alloys. The cutting force and surface roughness were increased with cutting speed, but the rate of change was decreased. Additionally, under the same cutting conditions, WNbMoTaZr\({}_{0.5}\) exhibited higher cutting forces than Cr12 MoV and GCr15, but with lower and more stable surface roughness, suggesting that increasing the depth of cut could improve machining efficiency. Furthermore, when the depth of cut was increased, the machined surface exhibited scale-like patterns and groove marks, which became more pronounced at higher cutting speeds. At a high cutting speed of 70 m/min, the light emission phenomenon was observed. The study also found that chip thickness and width were influenced by depth of cut, feed rate, and tool nose radius, with burn marks appearing on the chip's back surface. Moreover, the primary tool wear mechanism for machining WNbMoTaZr\({}_{0.5}\) RHEA was adhesive wear, which was decreased as the tool nose radius was increased. Adhesive wear decreased progressively. [PERSON] et al. [11] conducted milling experiments on AlCoCrFeNi HEA using a CNC milling machine. A four-factor and four-level orthogonal experiment was performed, and the trends and primary and secondary order of the influence of milling parameters on milling force were analyzed using extreme difference analysis and intuitive analysis, respectively. The process parameters included spindle speed, milling depth, milling width, and feed rate. The results showed that as spindle speed was increased, milling force gradually increased. With an increase in feed rate, milling force first increased, then decreased, and then increased again. As milling depth was increased, milling force increased and then decreased. When milling width was increased, milling force first decreased and then increased. Through extreme difference analysis, the trends and the degree of influence of milling parameters on the milling forces in three directions can be obtained. The factors that have the greatest influence on the milling force are the spindle speed, followed by milling depth and feed rate, and finally the milling width. [PERSON] et al. [12] investigated the face milling performance of HEAs with different elemental compositions and varying process parameters.