VELOCITY-DEPENDENT DEFORMATION MECHANISM OF FeNiCrCoTi HIGH-ENTROPY ALLOY UNDER VIBRATION-ASSISTED MACHINING

Trong-Tung Dam; Thi-Quy Vu; Xuan-Truong Vu; Dinh-Quan Doan

Trong-Tung Dam Solutions and Services Provides Joint Stock Company
Thi-Quy Vu Hung Yen University of Technology and Education
Xuan-Truong Vu Hung Yen University of Technology and Education
Dinh-Quan Doan Hung Yen University of Technology and Education

Abstract

Vibration-assisted machining has shown great potential for improving the processing of hard and tough materials, but its mechanisms in high-entropy alloys (HEAs) remain unclear. In this study, molecular dynamics simulations are employed to investigate the velocity-dependent behavior of FeNiCrCoTi monocrystal during vibration-assisted nano-machining. The study examines machining forces, shear strain, von Mises stress, dislocation evolution, temperature distribution, and surface morphology. The results reveal that higher velocities increase normal and tangential forces, stress concentration, and local temperature, while reducing shear strain, dislocation accumulation, groove width, and worn atom number. These findings provide new atomistic insights into the deformation and material removal mechanisms of HEAs under vibration-assisted machining.

References

G. Tang et al., “Grain refinement of CoCrFeNiMn high-entropy alloy for improved high-temperature tribological properties,” Journal of Alloys and Compounds, vol. 1014, p. 178853, 2025.

X. Xu et al., “Cryo-rolling and annealing-mediated phase transformation in Al5Ti2. 5Fe25Cr25Ni42. 5 high-entropy alloy: experimental, phase-field and CALPHAD investigation,” Journal of Materials Science & Technology, vol. 219, pp. 307-325, 2025.

M. Z. Lin, X. Xiao, C.-H. Xu, W. Lu, Y. Zhang, and W. B. Liao, “A nanostructured TiZrNbTaMo high-entropy alloy thin film with exceptional corrosion properties for biomedical application,” Applied Surface Science, vol. 684, p. 161859, 2025.

Z. Chen, W. Chen, B. Wu, X. Cao, L. Liu, and Z. Fu, “Effects of Co and Ti on microstructure and mechanical behavior of Al0. 75FeNiCrCo high entropy alloy prepared by mechanical alloying and spark plasma sintering,” Materials Science and Engineering: A, vol. 648, pp. 217-224, 2015.

A. Liang, D. C. Goodelman, A. M. Hodge, D. Farkas, and P. S. Branicio, “CoFeNiTix and CrFeNiTix high entropy alloy thin films microstructure formation,” Acta Materialia, vol. 257, p. 119163, 2023.

Z. Yang, L. Zhu, G. Zhang, C. Ni, and B. Lin, “Review of ultrasonic vibration-assisted machining in advanced materials,” International Journal of Machine Tools and Manufacture, vol. 156, p. 103594, 2020.

M. A. Khan et al., “A review on recent advancements in ultrasonic vibration-assisted machining of difficult-to-machine materials,” International Journal on Interactive Design and Manufacturing (IJIDeM), pp. 1-36, 2025.

H. Wu et al., “Unveiling the underlying mechanism of ultrasonic vibration assisted machining: Tip-based single asperity nanoscratching experiments and insights from molecular dynamics simulations,” Journal of Manufacturing Processes, vol. 140, pp. 78-90, 2025.

Q. Wang, J. Guo, W. Chen, and Y. Tian, “Molecular dynamics simulations of tensile properties for FeNiCrCoCu high-entropy alloy,” Materials Today Communications, vol. 38, p. 108187, 2024.

A. P. Thompson et al., “LAMMPS-a flexible simulation tool for particle-based materials modeling at the atomic, meso, and continuum scales,” Computer physics communications, vol. 271, p. 108171, 2022.

Z. H. Sun, J. Zhang, G. X. Xin, L. Xie, L. C. Yang, and Q. Peng, “Tensile mechanical properties of CoCrFeNiTiAl high entropy alloy via molecular dynamics simulations,” Intermetallics, vol. 142, p. 107444, 2022.

M. Yang et al., “Atomistic insights into the effects of Cr content on CoCrxFeNiTi tribological behavior: a molecular dynamics study,” Materials & Design, p. 114156, 2025.

J. Qiu, Z. Xu, J. Song, C. Hu, L. Miao, and X. He, “Molecular dynamics simulation of a new inhomogeneous concentration distribution model based on frictional behavior of FeNiCrCoCu high-entropy alloy,” Materials Today Communications, vol. 35, p. 106337, 2023.

A. Stukowski, “Visualization and analysis of atomistic simulation data with OVITO–the Open Visualization Tool,” Modelling and simulation in materials science and engineering, vol. 18, no. 1, p. 015012, 2009.

J. Xi, X. Ban, W. Ba, Z. Hui, L. Deng, and H. Qiu, “Molecular dynamics simulation of scratching parameters in diamond grit scratching single-crystal silicon carbide,” Materials Science in Semiconductor Processing, vol. 199, p. 109838, 2025.