Nanoindentation Size Effect of Tungsten Single Crystal

Zhou, Wen; Gao, Xuanqiao; Zhang, Pingxiang; Hu, Zhongwu; Li, Laiping; Cheng, Jianwei

doi:10.1016/s1875-5372(18)30048-1

Cited by 14 publications

(4 citation statements)

References 22 publications

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“…Wen et al . 17 also reported that, with the addition of Zr, the grain size in the Al-Zn-Mg-Cu alloy still grew after a prolonged homogenization process.…”

Section: Introductionmentioning

confidence: 89%

Microstructure Control and Performance Evolution of Aluminum Alloy 7075 by Nano-Treating

Zuo

Sokoluk

Cao

et al. 2019

Sci Rep

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Nano-treating is a novel concept wherein a low percentage of nanoparticles is used for microstructural control and property tuning in metals and alloys. The nano-treating of AA7075 was investigated to control its microstructure and improve its structural stability for high performance. After treatment with TiC nanoparticles, the grains were significantly refined from coarse dendrites of hundreds of micrometers to fine equiaxial ones smaller than 20 μm. After T6 heat treatment, the grains, with an average size of 18.5 μm, remained almost unchanged, demonstrating an excellent thermal stability. It was found that besides of growth restriction factor by pinning behavior on grain boundries, TiC nanoparticles served as both an effective nucleation agent for primary grains and an effective secondary phase modifier in AA7075. Furthermore, the mechanical properties of nano-treated AA7075 were improved over those of the pure alloy. Thus, nano-treating provides a new method to enhance the performance of aluminum alloys for numerous applications.

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“…Wen et al . 17 also reported that, with the addition of Zr, the grain size in the Al-Zn-Mg-Cu alloy still grew after a prolonged homogenization process.…”

Section: Introductionmentioning

confidence: 89%

Microstructure Control and Performance Evolution of Aluminum Alloy 7075 by Nano-Treating

Zuo

Sokoluk

Cao

et al. 2019

Sci Rep

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“…Additionally, nanoindentation is essentially depth-sensitive: the volume range acted on by the indenter at different depths into the sample varies, potentially producing different mechanical responses and different mechanical data. Previous materials science studies have demonstrated the universality of the indentation size effect (ISE), which is manifested as the measured elastic modulus and hardness increasing with decreasing load (or indentation depth). , The measured creep behavior of metals also shows significant ISE, − as the creep strain rate sensitivity ( m ) and hardness can become smaller as the indentation displacement deepens, − , whereas some metallic films have exhibited the opposite behavior . Furthermore, the mechanical and creep properties of polymer materials were reported to depend strongly on the indentation loading rate, with a higher loading strain rate generally leading to higher values of hardness and lower creep strain rate sensitivity .…”

Section: Introductionmentioning

confidence: 99%

Using Nanoindentation to Characterize the Mechanical and Creep Properties of Shale: Load and Loading Strain Rate Effects

et al. 2022

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The mechanical and creep properties of shale strongly influence artificial hydraulic fracturing, wellbore stability, and the evaluation of reservoir performance in shale gas exploration. This study characterized these mechanical and creep properties at the microscale through nanoindentation tests and evaluated their dependence on the indentation test parameters, specifically, the indentation load and the loading strain rate. The mechanical parameters (the Young’s modulus and hardness) of shale were strongly influenced by the magnitude of an indentation load (2–400 mN). Both parameters decreased sharply as the load increased from 2 to 200 mN; they then remained relatively stable at loads of 200–400 mN, suggesting that large indentation loads (200–400 mN) can be used to detect the mechanical responses of bulk shale. In contrast, both parameters increased slightly as the loading strain rate increased from 0.005 to 0.1 s –1 . The indentation creep ( C IT ), related to creep behavior, and the creep strain rate sensitivity ( m ), related to the creep mechanism of shale, both increased with increasing the indentation load, whereas they decreased with increasing the loading strain rate. This demonstrates that increasing the load or decreasing the loading strain rate can increase creep deformation in shale during nanoindentation creep testing. The values of m varied from 0.040 to 0.124 under different loading conditions, suggesting that dislocation power-law creep may be the main mechanism controlling creep in shale. This study standardizes the testing parameters for the characterization of the mechanical properties of shale by nanoindentation testing and also advances our understanding of the deformation mechanisms of shale at the microscale.

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“…Atomistic simulations based on molecular dynamics (MD) can provide information about plastic deformation mechanisms, although there are limitations in some cases. These simulations are now capable of saving financial and technological resources [1][2][3][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Nanoindentation of tungsten: From interatomic potentials to dislocation plasticity mechanisms

Domínguez-Gutiérrez

Grigorev

Naghdi

et al. 2023

Phys. Rev. Materials

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In this study, we employed molecular dynamics simulations, both traditional and machine learned, to emulate spherical nanoindentation experiments of crystalline W matrices at different temperatures and loading rates using different approaches, such as EAM, EAM with Ziegler, Biersack, and Littmark corrections, modified EAM, analytic bond-order approach, and a recently developed machine-learned tabulated Gaussian approximation potential (tabGAP) framework for describing the W-W interaction and plastic deformation mechanisms. Results showed similarities between the recorded load-displacement curves and dislocation densities, for different interatomic potentials and crystal orientations at low and room temperature. However, we observe concrete differences in the early stages of elastic-to-plastic deformation transition, revealing different mechanisms for dislocation nucleation and dynamics during loading, especially at higher temperatures. This is attributed to the particular features of orientation dependence in crystal plasticity mechanisms and, characteristically, the stacking fault and dislocation glide energies information in the interatomic potentials, with tabGAP being the one with the most well-trained results compared to density functional theory calculations and experimental data.

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Nanoindentation Size Effect of Tungsten Single Crystal

Cited by 14 publications

References 22 publications

Microstructure Control and Performance Evolution of Aluminum Alloy 7075 by Nano-Treating

Microstructure Control and Performance Evolution of Aluminum Alloy 7075 by Nano-Treating

Using Nanoindentation to Characterize the Mechanical and Creep Properties of Shale: Load and Loading Strain Rate Effects

Nanoindentation of tungsten: From interatomic potentials to dislocation plasticity mechanisms

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