Balancing strength and plasticity of dual-phase amorphous/crystalline nanostructured Mg alloys*

Wang, Jiayi; Song, Haiyang; An, M.R.; Deng, Qiong; Li, Yu Long

doi:10.1088/1674-1056/ab84d5

Cited by 4 publications

(1 citation statement)

References 46 publications

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“…For the case of isopachous Ti/Ni nanowires with larger layer thickness, the plastic behaviors are greatly different from those of previous two samples. The microstructure evolutions of the longest Ti/Ni MNW (λ = 7.17 nm) are presented in ior, which has also been discovered in simulation [21,22,[37][38][39] and experiment [40,41] of HCP materials. Hereafter, the newly formed Ti/Ni nanowire undergoes another elastic stage until the tensile strain reaches the 0.073.…”

Section: Atomic Configuration Evolutionsmentioning

confidence: 57%

Molecular dynamics study of coupled layer thickness and strain rate effect on tensile behaviors of Ti/Ni multilayered nanowires*

Su¹,

Deng²,

Liu³

et al. 2021

Chinese Phys. B

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Novel properties and applications of multilayered nanowires (MNWs) urge researchers to understand their mechanical behaviors comprehensively. Using the molecular dynamic simulation, tensile behaviors of Ti/Ni MNWs are investigated under a series of layer thickness values (1.31, 2.34, and 7.17 nm) and strain rates ( 1.0 × 10 8 s − 1 ≤ ε . ≤ 5.0 × 10 10 s − 1 ). The results demonstrate that deformation mechanisms of isopachous Ti/Ni MNWs are determined by the layer thickness and strain rate. Four distinct strain rate regions in the tensile process can be discovered, which are small, intermediate, critical, and large strain rate regions. As the strain rate increases, the initial plastic behaviors transform from interface shear (the shortest sample) and grain reorientation (the longest sample) in small strain rate region to amorphization of crystalline structures (all samples) in large strain rate region. Microstructure evolutions reveal that the disparate tensile behaviors are ascribed to the atomic fractions of different structures in small strain rate region, and only related to collapse of crystalline atoms in high strain rate region. A layer thickness-strain rate-dependent mechanism diagram is given to illustrate the couple effect on the plastic deformation mechanisms of the isopachous nanowires. The results also indicate that the modulation ratio significantly affects the tensile properties of unequal Ti/Ni MNWs, but barely affect the plastic deformation mechanisms of the materials. The observations from this work will promote theoretical researches and practical applications of Ti/Ni MNWs.

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Section: Atomic Configuration Evolutionsmentioning

confidence: 57%

Molecular dynamics study of coupled layer thickness and strain rate effect on tensile behaviors of Ti/Ni multilayered nanowires*

Su¹,

Deng²,

Liu³

et al. 2021

Chinese Phys. B

Self Cite

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Atomic-scale insight into mechanical properties and deformation behavior of crystalline/amorphous dual-phase high entropy alloys

Song

et al. 2022

Physics Letters A

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Uncovering strengthening and softening mechanisms of nano-twinned CoCrFeCuNi high entropy alloys by molecular dynamics simulation

Shen

Song

et al. 2022

Journal of Applied Physics

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High-entropy alloys (HEAs) break the design concept of traditional alloys and exhibit excellent mechanical properties. However, as a new member of the alloy family in recent years, the dependence of the deformation behavior of the HEAs on alloy composition and twin boundary (TB) is still unclear, and many phenomena urgently need to be revealed. Here, the effects of TB spacing and Ni concentration on the mechanical properties and deformation behavior of the nano-twinned (CoCrFeCu)1−XNiX HEA (nt-HEA) under tensile loading are investigated by molecular dynamics simulation. The results show that with the decrease in TB spacing, the average flow stress of the nt-HEA changes from Hall–Petch strengthening to inverse Hall–Petch softening. When the TB spacing is greater than a critical value, the plastic deformation mechanism is dominated by the slip of partial dislocations. However, when the TB spacing is less than the critical value, the plastic deformation mechanism is transformed into the formation of voids induced by the amorphous phase, which becomes the key factor for the softening of the nt-HEA. It is also found that the mechanical properties of the nt-HEA can also change from strengthening to softening by adjusting Ni concentration, which is closely related to the change of stacking fault energy of the nt-HEA. In addition, the plastic deformation mechanism and voids formation mechanism of the nt-HEA are also discussed in detail.

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Balancing strength and plasticity of dual-phase amorphous/crystalline nanostructured Mg alloys*

Cited by 4 publications

References 46 publications

Molecular dynamics study of coupled layer thickness and strain rate effect on tensile behaviors of Ti/Ni multilayered nanowires*

Molecular dynamics study of coupled layer thickness and strain rate effect on tensile behaviors of Ti/Ni multilayered nanowires*

Atomic-scale insight into mechanical properties and deformation behavior of crystalline/amorphous dual-phase high entropy alloys

Uncovering strengthening and softening mechanisms of nano-twinned CoCrFeCuNi high entropy alloys by molecular dynamics simulation

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