Modulation period dependent mechanical properties of Cu/Fe metallic multilayered films

FS Gao and XH Peng and C Huang and X Yue and B Yang and S Sun and T Fu, AIP ADVANCES, 8, 045208 (2018).

DOI: 10.1063/1.5023462

We performed molecular dynamics simulations for uniaxial tension of Cu/Fe nanomultilayered films with different modulation periods (lambda) using Kurdjumov-Sachs (K-S) relationship to investigate their interfacial morphologies and the effects of lambda on their mechanical properties. It shows that the mismatch dislocation lines at the interfaces are periodic. At the Cu side of the interface, triangles distribute with the smallest period; while at the Fe side, parallelograms distribute with the smallest period. There are two yield points, except the case of lambda=2.10 nm where there is only one yield point, in the stress-strain curve of Cu/Fe multilayer film under tension, corresponding to the sequential nucleation of dislocations in the Cu and Fe layers from interface, respectively. We further found that there is a critical modulation period, lambda(c), and the flow stress decreases with the increases of lambda if lambda > lambda(c) while increases with the increases of lambda if lambda < lambda c. The possible mechanisms are discussed. (C) 2018 Author(s).

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