Effect of vibration parameters on the material removal characteristics of high-entropy alloy in scratching

• Published in: International journal of mechanical sciences 2022-10, Vol.232, p.107597, Article 107597
• Main Authors: Doan, Dinh-Quan, Fang, Te-Hua
• Format: Article
• Language: English
• Subjects: High-entropy alloy; MD simulation; Scratching behavior; Vibration-assisted scratching
• ISSN: 0020-7403; 1879-2162
• DOI: 10.1016/j.ijmecsci.2022.107597

•Vibration-assisted scratching effectively decreases total force compared to conventional scratching.•Increase in amplitude and frequency leads to the reduction in total force, which is beneficial for scratching.•Increasing frequency causes an increase in scratched zone temperature, which has a positive effect on machining.•The scratching with a large vibration amplitude and frequency can remove more material. Although vibration-assisted scratching achieves higher machining efficiency than conventional scratching, its microstructural behavior is still unclear. In the present work, the deformation behavior and microstructural growth of monocrystalline CoCrFeNiCu high-entropy alloy during the vibration-assisted scratching through molecular dynamics simulation are investigated. The expected result shows that the vibration-assisted scratching effectively decreases the total force compared to the conventional scratching. The increase in the vibration amplitude and frequency leads to the reduction in the total force, which is advantageous in scratching. The shear strain concentration region in vibration-assisted scratching is larger than that of conventional scratching due to the expansion of the scratched area. Besides, the increase in vibration amplitude and frequency leads to a corresponding increase in shear strain and residual stress. The vibration-assisted scratching produces a larger high-temperature zone than the conventional scratching, and the increase of vibration frequency also results in an increase in the scratched zone temperature, which has a positive effect on easier machining. The microstructure evolution shows that Shockley partial dislocations account for the majority of the total dislocations. Moreover, the scratching with a large vibration amplitude and frequency removes more material. Therefore, insights into scratching behavior at the atomic level can aid in the optimization of the vibration-assisted machining process. The figure shows the simulation model (a), average force (b), surface morphologies (c). [Display omitted]