EFFECTS OF TEMPERATURE ON THE MECHANICAL PROPERTIES AND CRACK GROWTH OF HIGH ENTROPY ALLOY CuCrFeNiCo DURING TENSILE PROCESS
Abstract
In this study, the molecular dynamics simulation method was used to study the influence of temperature on the mechanical properties and crack growth of the high-entropy alloy CuCrFeNiCo during the drawing process. Typical mechanical parameters such as deformation morphology, atomic structure changes, shear stress and von Mises stress distribution, stress-strain relationship and crystal lattice buckling phenomenon are analyzed. The results show that the crack growth trend and the general deformation trend of the samples are quite similar when the temperature changes. However, at higher temperatures, the tensile strength value of the high-entropy alloy CuCrFeNiCo is lower. The phase transformation from the FCC structure to the HCP structure is predominant and the Shockley lattice buckling type dominates during the pulling process. Atoms with high shear strain are concentrated mainly at the locations where the material is most severely deformed. The von Mises stress increases markedly as the temperature increases.
References
Verma, A., Tarate, P., Abhyankar, A. C., Mohape, M. R., Gowtam, D. S., Deshmukh, V. P., & Shanmugasundaram, T., High temperature wear in CoCrFeNiCux high entropy alloys: The role of Cu. Scripta Materialia, 2019, 161, pp. 28-31.
Li, Z., Qiao, D., Xu, Y., Zhou, E., Yang, C., Yuan, X., ... & Wang, F., Cu-bearing high-entropy alloys with excellent antiviral properties. Journal of Materials Science & Technology, 2021, 84, 59.
Suryanarayana, C. J. I. M. R., Nanocrystalline materials. International materials reviews, 1995, 40(2), pp. 41-64.
Meyers, M. A., Mishra, A., & Benson, D. J., Mechanical properties of nanocrystalline materials. Progress in materials science, 2006, 51(4), pp. 427-556.
Deluigi, O. R., Pasianot, R. C., Valencia, F. J., Caro, A., Farkas, D., & Bringa, E. M., Simulations of primary damage in a High Entropy Alloy: Probing enhanced radiation resistance. Acta Materialia, 2021, 213, 116951.
Tran, A. S., Effects of Temperature on Tensile Characteristics of Nanocrystalline Cu50Ni50 Alloy using Molecular Dynamics Simulation. UTEHY Journal of Science and Technology, 2022, 34, pp. 13-17.
Rubio, R. A., Haouala, S., & LLorca, J., Grain boundary strengthening of FCC polycrystals. Journal of Materials Research, 2019, 34(13), pp. 2263-2274.
