Tensile strength and failure mechanism of hcp zirconium nanowires: Effect of diameter, temperature and strain rate

Guder, V.; Sengül, S.

doi:10.1016/j.commatsci.2020.109551

Cited by 11 publications

(3 citation statements)

References 36 publications

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“…It is similar to the zigzag stress-strain curve reported by Tong et al [43] in the tensile experiment of Al-Mg alloy. This phenomenon was also observed in the simulation study of mechanical properties of zirconium nanowires by Guder et al [44]. In Figure 13a, the initial stress value is higher than zero at small grain size.…”

Section: Effect Of Grain Size On Mechanical Properties and Structural...supporting

confidence: 80%

A Multi-Scale Study on Deformation and Failure Process of Metallic Structures in Extreme Environment

Shi

et al. 2022

IJMS

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It is a macro-micro model study for defect initiation, growth and crack propagation of metallic truss structure under high engine temperature and pressure conditions during the reentry atmosphere. Till now, the multi-scale simulation methods for these processes are still unclear. We explore the deformation and failure processes from macroscale to nanoscale using the Gas-Kinetic Unified Algorithm (GKUA) and all-atomic, molecular dynamic (MD) simulation method. The behaviors of the dislocations, defect evolution and crack propagation until failure for Aluminum-Magnesium (Al-Mg) alloy are considered with the different temperature background and strain fields. The results of distributions of temperature and strain field in the aerodynamic environment obtained by molecular dynamics simulations are in good agreement with those obtained from the macroscopic Boltzmann method. Compared to the tensile loading, the alloy structure is more sensitive to compression loading. The polycrystalline Al-Mg alloy has higher yield strength with a larger grain size. It is due to the translation of plastic deformation mode from grain boundary (GB) sliding to dislocation slip and the accumulation of dislocation line. Our findings have paved a new way to analyze and predict the metallic structural failure by micro-scale analysis under the aerodynamic thermal extreme environment of the reentry spacecraft on service expiration.

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Section: Effect Of Grain Size On Mechanical Properties and Structural...supporting

confidence: 80%

A Multi-Scale Study on Deformation and Failure Process of Metallic Structures in Extreme Environment

Shi

et al. 2022

IJMS

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show abstract

“…Besides size and strain rate effect, the temperature effect is a significant factor affecting the mechanical properties in most of metallic nanowires. [13,16,20,23,25,28] We use the MD method to evaluate the tensile properties of isopachous Ti/Ni MNWs in a wide range of temperatures (0.01 K-500 K). When the layer thickness and strain rate are fixed, increasing temperature causes only the elastic modulus and yield stress to change, showing obvious thermal softening effect.…”

Section: Effect Of Modulation Ratio On Tensile Properties Of Unequal ...mentioning

confidence: 99%

“…The size effect is ubiquitous in metallic nanowires, and observed in almost all kinds of metallic nanowires. [13][14][15][16][17][18][19] Wu used the MD method to seek for relaxation and tension behaviors of Cu nanowires. They found that the elastic modulus and strength of the nanowire are dependent on the cross-sectional size, and supposed that the size effect is attributed to surface effect.…”

Section: Introductionmentioning

confidence: 99%

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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Strengthening behaviour of continuous graphene network in metal matrix composites

Yang

Liu

Zhou

et al. 2021

Carbon

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Tensile strength and failure mechanism of hcp zirconium nanowires: Effect of diameter, temperature and strain rate

Cited by 11 publications

References 36 publications

A Multi-Scale Study on Deformation and Failure Process of Metallic Structures in Extreme Environment

A Multi-Scale Study on Deformation and Failure Process of Metallic Structures in Extreme Environment

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

Strengthening behaviour of continuous graphene network in metal matrix composites

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