Generation of misfit dislocations in a core-shell nanowire near the edge of prismatic core

Смирнов, А. М.; Krasnitckii, S.A.; Gutkin, M. Yu.

doi:10.1016/j.actamat.2020.01.018

Cited by 21 publications

(8 citation statements)

References 92 publications

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“…A quantitative description of these mechanisms requires a special theoretical examination similar to those given recently in Refs. [27,28].…”

Section: Resultsmentioning

confidence: 99%

Misfit Stresses Due to a Cylindrical Dilatational Inclusion of Annular-Sector Cross-Section in an Infinite Elastic Medium

Gudkina¹,

Krasnitckii²,

Gutkin³

2021

Rev Adv Mater Tech

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An elastic model for a cylindrical dilatational inclusion of annular-sector cross-section in an infinite elastic medium is considered. The stress fields are found in a closed analytical form and are illustrated by stress maps. Specific features in the stress distribution are revealed and discussed in detail. It is shown that the stress magnitude can be so high that various mechanisms of stress relaxation can be activated.

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“…A quantitative description of these mechanisms requires a special theoretical examination similar to those given recently in Refs. [27,28].…”

Section: Resultsmentioning

confidence: 99%

Misfit Stresses Due to a Cylindrical Dilatational Inclusion of Annular-Sector Cross-Section in an Infinite Elastic Medium

Gudkina¹,

Krasnitckii²,

Gutkin³

2021

Rev Adv Mater Tech

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“…The dislocation networks are formed between the twin variants and the initial matrix (figure 7(b″)) and propagate with the growth of the twin variants. The dislocation behaviors in core-shell NWs have been studied in detail by A.M. Smirnov et al [34]. Figure 6(d) shows that the dislocation density increases sharply with the nucleation and growth of the twin embryos from Points a to c. This indicates that the nucleation and growth of the twin variants are related to the dislocation motion.…”

Section: Microstructure Evolution Analysismentioning

confidence: 91%

Improvement of plastic property of Ti/Al nanowires by designing the core–shell structures

Gao,

Ding,

Liu

et al. 2023

Phys. Scr.

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Ti alloy has the disadvantages of low elastic modulus, high yield ratio, and low plasticity, therefore, improving its plasticity is very important to promote their use. In this study, the tensile behavior of Ti/Al core–shell nanowires (NWs) in the z-axis direction of single-crystal Ti with [0001] grain-oriented HCP structure and single-crystal Al with [001] grain-oriented FCC structure was investigated using molecular dynamic (MD) simulations to explore the mechanism of enhanced ductility in Ti alloy. The results indicate that the shell thickness may significantly affect the mechanical behaviors of the NWs. For the mechanical properties of core–shell NWs, Young’s modulus, ultimate tensile strength (UTS), Specific modulus, Specific strength, flow stress, and fracture strain showed sensitivity to shell thickness. Compared with core–shell NWs, single crystal Ti NW has greater strength and higher Young’s modulus, Specific strength and UTS. By contrast, core–shell NWs have better Specific modulus and plastic properties, their flow stress and fracture strain are higher than those of single crystal Ti NW. For the single crystal Ti NW, the main plastic deformation mechanisms are shear band nucleation and recrystallization. For Ti/Al core–shell NWs with shell thicknesses of 1and 2 nm, the nucleation of the twin variants replaces the dominant position of the shear bands. As the twin boundaries (TBs) expand, the dislocation slip is activated, and grain reorientation occurs, inducing the superior plastic properties of NWs. As the shell thickness increases to 3–5 nm, the interaction between the twin variants and shear bands reduces the expansion rate of the TBs, resulting in increased flow stress and fracture strain of the NWs. This study can provide theoretical guidance for the experimental study and preparation of core–shell NWs.

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“…Introducing the expressions for approximations under consideration (12)(13)(14)(15) in Eqs. (7) with regard to Eqs.…”

Section: Modelmentioning

confidence: 99%

“…To date, the theoretical models describing the stressstrain state in axial NWs with a diffuse interface have been developed [6][7][8], while an elastic model of radial NWs have not been suggested yet. Besides, the available theoretical model of misfit stress relaxation in core-shell heterostructures [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] employs the analytical expressions of the elastic stress induced by eigenstrain defined by Heaviside theta function.…”

Section: Introductionmentioning

confidence: 99%

Misfit Stress in Radial Core-Shell Nanowires with Diffuse Interface Boundaries

Khramov¹,

Krasnitckii²,

Smirnov³

2022

Rev. Adv. Mater. Technol.

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The elastic models of radial core-shell nanowires with diffuse interphase boundaries are suggested. The concept of eigenstrain is employed to consider a misfit stress distribution induced by diffusive interfaces with different range of distinctness. The eigenstrain profile described by the misfit parameter is approximated by piecewise-linear, error and arctangent functions. For these approximations the elastic stresses in core-shell nanowires are analytically derived, illustrated with plots and discussed in detail.

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Generation of misfit dislocations in a core-shell nanowire near the edge of prismatic core

Cited by 21 publications

References 92 publications

Misfit Stresses Due to a Cylindrical Dilatational Inclusion of Annular-Sector Cross-Section in an Infinite Elastic Medium

Misfit Stresses Due to a Cylindrical Dilatational Inclusion of Annular-Sector Cross-Section in an Infinite Elastic Medium

Improvement of plastic property of Ti/Al nanowires by designing the core–shell structures

Misfit Stress in Radial Core-Shell Nanowires with Diffuse Interface Boundaries

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