EFFECTS OF TEMPERATURE ON TENSILE CHARACTERISTICS OF NANOCRYSTALLINE Cu50Ni50 ALLOY USING MOLECULAR DYNAMICS SIMULATION
In this paper, the effects of different temperatures on the tensile characteristics of nanocrystalline Cu50Ni50 alloy is investigated using molecular dynamics simulation method. The stress-strain relationship, phase transformations, lattice dislocations, shear strain and von Mises stress distributions are evaluated. The results show that the higher the temperature, the lower the tensile strength of the nanocrystalline Cu50Ni50 alloy. The phase transition from the FCC structure to the HCP structure is predominant and the Shockley lattice dislocation pattern prevails during the tensile process. The atoms with high shear strain are concentrated mainly at the sites where the material is most severely deformed. The von Mises stress increases markedly with increasing temperature.
Hashmi, S. (Ed.), Reference module in materials science and materials engineering, 2015, Elsevier.
Arzt, E. J. A. M., Size effects in materials due to microstructural and dimensional constraints: a comparative review. Acta materialia, 1998, 46(16), pp. 5611-5626.
Lu, K., Nanocrystalline metals crystallized from amorphous solids: nanocrystallization, structure, and properties. Materials Science and Engineering: R: Reports, 1996, 16(4), pp. 161-221.
Fischer, F., Schmitz, G., & Eich, S. M., A systematic study of grain boundary segregation and grain boundary formation energy using a new copper–nickel embedded-atom potential. Acta Materialia, 2019, 176, pp. 220-231.
Tran, A. S., & Fang, T. H., Void growth and coalescence in Cu-Ta metallic glasses using molecular dynamics. Computational Materials Science, 2019, 168, pp. 144-153.
Tran, A. S., Fang, T. H., & Hsiao, J. W., Incipient plasticity and voids nucleation of nanocrystalline gold nanofilms using molecular dynamics simulation. Current Applied Physics, 2019, 19(3), pp. 332-340.
Varvenne, C., Luque, A., & Curtin, W. A., Theory of strengthening in fcc high entropy alloys. Acta Materialia, 2016, 118, pp. 164-176.
Doan, D. Q., Fang, T. H., & Chen, T. H., Effects of grain and twin boundary on friction and contact characteristics of CuZrAl nanocrystallines. Applied Surface Science, 2020, 524, p.146458.