Pseudoelasticity and shape memory effects in cylindrical FCC metal nanowires

Rezaei, Reza; Deng, Chuang

doi:10.1016/j.actamat.2017.04.039

Cited by 24 publications

(11 citation statements)

References 29 publications

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“…Thus, the re-orientation of the Ag NW from (110) into a more preferred (100) (see Figure 4 ) phase, as also shown in Figure 3 a, conferred additional plasticity to the Ag NW. This behavior is reported in numerous studies [ 7 , 8 , 9 , 10 ] related to deformation in metallic nanowires. At elevated temperatures, the propagation of twin boundaries is retarded due to thermal vibrations and complete transformation from (110) to (100) phase is not possible.…”

Section: Results and Discussionsupporting

confidence: 72%

“…At the nanoscale, 1D NWs usually exhibit ultra high strength, differently from bulk materials, which makes them ideal candidates for studying their fundamental deformation mechanisms. Dislocation nucleation from free surfaces and its subsequent propagation through NWs has been found to be a dominant deformation mechanism in metallic NWs such as Au, Ag, Cu, and Ni [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ]. This enables reorientation to a more preferred phase, resulting in exceptional mechanical properties such as superplasticity, high yielding strength, pseudoelasticity, and shape memory effects [ 5 , 6 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

“…Dislocation nucleation from free surfaces and its subsequent propagation through NWs has been found to be a dominant deformation mechanism in metallic NWs such as Au, Ag, Cu, and Ni [5][6][7][8][9][10][11][12][13]. This enables reorientation to a more preferred phase, resulting in exceptional mechanical properties such as superplasticity, high yielding strength, pseudoelasticity, and shape memory effects [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Further, it has also been reported that the nucleation of dislocation and twinning is often dependent on stacking fault energy in the metals. Molecular dynamics simulations are a well known technique to investigate the atomic mechanisms related to mechanical properties [5][6][7][8][9]36], phase transformation [37,38], deformation behavior [5,6,23,39,40], etc. of both the bulk and nanoscale systems.…”

Section: Introductionmentioning

confidence: 99%

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Temperature-Dependent Superplasticity and Strengthening in CoNiCrFeMn High Entropy Alloy Nanowires Using Atomistic Simulations

et al. 2021

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High strength and ductility, often mutually exclusive properties of a structural material, are also responsible for damage tolerance. At low temperatures, due to high surface energy, single element metallic nanowires such as Ag usually transform into a more preferred phase via nucleation and propagation of partial dislocation through the nanowire, enabling superplasticity. In high entropy alloy (HEA) CoNiCrFeMn nanowires, the motion of the partial dislocation is hindered by the friction due to difference in the lattice parameter of the constituent atoms which is responsible for the hardening and lowering the ductility. In this study, we have examined the temperature-dependent superplasticity of single component Ag and multicomponent CoNiCrFeMn HEA nanowires using molecular dynamics simulations. The results demonstrate that Ag nanowires exhibit apparent temperature-dependent superplasticity at cryogenic temperature due to (110) to (100) cross-section reorientation behavior. Interestingly, HEA nanowires can perform exceptional strength-ductility trade-offs at cryogenic temperatures. Even at high temperatures, HEA nanowires can still maintain good flow stress and ductility prior to failure. Mechanical properties of HEA nanowires are better than Ag nanowires due to synergistic interactions of deformation twinning, FCC-HCP phase transformation, and the special reorientation of the cross-section. Further examination reveals that simultaneous activation of twining induced plasticity and transformation induced plasticity are responsible for the plasticity at different stages and temperatures. These findings could be very useful for designing nanowires at different temperatures with high stability and superior mechanical properties in the semiconductor industry.

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Section: Results and Discussionsupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Temperature-Dependent Superplasticity and Strengthening in CoNiCrFeMn High Entropy Alloy Nanowires Using Atomistic Simulations

et al. 2021

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“…In NWs, however, twin formation is not necessarily followed by dislocations slip, but rather by twinning on conjugate slip planes [27]. In our calculations, we observed a transition from twinning to full slip, in agreement with previous atomistic simulations [23,28]. This difference between experiments and simulations might be partly explained by the crystal re-orientation caused by twinning and the use of periodic boundary conditions in simulations, whereas experimentally NW ends are clamped.…”

Section: Au-nw At 300ksupporting

confidence: 83%

Molecular dynamics study of mechanical behavior of gold-silicon core-shell nanowires under cyclic loading

2019

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Composite systems at nanoscale are promising to design new materials combining different interesting properties, like high strength and good plasticity. In the present work, we compare mechanical properties of gold-silicon core-shell and pure gold nanowires subjected to several tensile loadings and compressive unloadings at 300 K and 1 K, in order to evaluate the ability of a hard amorphous silicon shell to stabilize a crystalline gold core during cyclic loading. The hard shell appears involved in the quasi-reversible macroscopic plasticity of core-shell NW, by promoting twins, stacking fault and isolated full dislocations, due to a confinement effect of the core. In addition, our simulations revealed that the reversible behavior is progressively lost over cycles. The analysis of the amorphous shell shows that large strains combined with high strain rate prevent self-healing of the shell, leading to shell failure and to reversibility loss.

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Influence of dislocations, twins, and stacking faults on the fracture behavior of nanocrystalline Ni nanowire under constant bending load: a molecular dynamics study

Reddy

Pal

2018

J Mol Model

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In this paper, constant load bending tests were performed on a nanocrystalline Ni nanowire specimen at different deformation temperatures using molecular dynamics simulation to investigate deformation behavior and mechanisms responsible for fracture. The nature of the fracture occurred in this nanowire specimen is found to transit from brittle to ductile as the temperature rises from 500 to 800 K. Also, with an increase in temperature, the fracture strain is increased indicating more plastic deformation prior to fracture. In the case of 500 K and 600 K deformation temperatures, fracture occurred along the shear band due to slip-twin interaction. On the other hand, at comparatively higher deformation temperatures, such as 700 K and 800 K, twinning and detwinning mechanisms are responsible for accommodating large plastic strain before fracture thus imparting plasticity in the specimen. It has also been found that formation and collapse of the stacking fault tetrahedron causes fracture of nanocrystalline Ni nanowire at 800 K.

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Pseudoelasticity and shape memory effects in cylindrical FCC metal nanowires

Cited by 24 publications

References 29 publications

Temperature-Dependent Superplasticity and Strengthening in CoNiCrFeMn High Entropy Alloy Nanowires Using Atomistic Simulations

Temperature-Dependent Superplasticity and Strengthening in CoNiCrFeMn High Entropy Alloy Nanowires Using Atomistic Simulations

Molecular dynamics study of mechanical behavior of gold-silicon core-shell nanowires under cyclic loading

Influence of dislocations, twins, and stacking faults on the fracture behavior of nanocrystalline Ni nanowire under constant bending load: a molecular dynamics study

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