Influences of grain size and twin boundary on the tensile properties of nanocrystalline face-centered cubic Cu50Ni50 alloy

• Published in: Molecular simulation Vol. 48; no. 14; pp. 1256 - 1268
• Main Author: Tran, Anh-Son
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 22.09.2022; Taylor & Francis Ltd
• Subjects: Algorithms; Copper base alloys; Face centered cubic lattice; grain growth; Grain size; Hall-Petch relation; Mechanical properties; Molecular dynamics; Nanocrystalline; Nanocrystals; Nickel base alloys; Shear strain; Stacking faults; Stress-strain relationships; Tensile properties; Tensile strength; tension process; Twin boundaries; twin boundary
• ISSN: 0892-7022; 1029-0435
• DOI: 10.1080/08927022.2022.2080823

The effects of grain size (GS) and distance between twin boundaries (d) on the tensile properties of nanocrystalline (NC) face-centered cubic Cu 50 Ni 50 alloy are studied using the molecular dynamics simulations. The common neighbour analysis, dislocation extraction algorithm, shear strain, and von Mises stress configurations together with the total dislocation length, stress-strain relation, and tensile strength diagrams are presented to investigate the mechanical characteristics of the NC Cu 50 Ni 50 specimens. The results exhibits that the twin boundaries significantly restrict the formation and propagation of the stacking faults. The integral deformation occurs under a combination of displacement, breakage, and self-destruction of the twin boundary along with the contraction and expansion of the grains. The tensile strength increases as the GS and the d increase, which agrees with the inverse Hall-Petch relation. The tensile strength of the conventional NC is higher than that of the twinned NC for each pair of specimens with the same GS.