文献类型：期刊文献

英文题名：Study on the effect of grain size on the nanocutting mechanism of polycrystalline FeCoNiCrCu

作者：Zhang, Ping[1];Li, Guohong[1];Jiang, Xiaomin[1];Chen, Xue[1]

机构：[1]Guangdong Ocean Univ, Coll Mech & Power Engn, Zhanjiang, Peoples R China

年份：2026

卷号：48

期号：4

外文期刊名：JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:001718261900021)、、EI(收录号：20261220332383)、WOS

基金：This study was funded by several organizations, including the National Natural Science Foundation of China under grant numbers 51705270 and the Shandong Qingchuang Science and Technology Project (grant number 2019KJB022).

语种：英文

外文关键词：High-entropy alloys; Nanocutting; Grain size; Subsurface defects; Dislocation evolution

外文摘要：High-entropy alloys (HEAs) exhibit excellent machining performance due to their compositional diversity. In nanocutting, grain refinement can further enhance the material's plastic deformation capacity and surface integrity. This study uses molecular dynamics (MD) simulations to analyze the microplastic deformation mechanisms of polycrystalline FeCoNiCrCu HEA during nanocutting, focusing on the influence of different grain sizes. By constructing polycrystalline and nanocutting models, we examine the effects of grain size on cutting forces, surface morphology, dislocation defects, and stress distribution. Results indicate that larger grains (10.47 nm) allow dislocations to propagate over longer distances, leading to a more uniform plastic deformation. In contrast, smaller grains (6.49 nm) result in stronger boundary obstruction of dislocations, leading to local accumulation, narrower shear zones, and enhanced resistance to deformation. Reducing grain size increases dislocation density and stress concentration in the cutting zone, amplifying sub-surface defect evolution. Moreover, HEAs with smaller grains demonstrate stronger resistance to deformation and reduced cutting forces during the cutting process. This research provides insights into the micro-behavior of HEAs in nanomanufacturing and guidance for precision machining processes of high-performance materials.