Strain-rate dependence of surface/subsurface deformation mechanisms during nanoscratching tests of GGG single crystal

Li, Chen; Zhang, Feihu; Piao, Yinchuan

doi:10.1016/j.ceramint.2019.04.238

Cited by 42 publications

(20 citation statements)

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“…Figure 3 b–d, Figure 4 b–d, Figure 5 b–d and Figure 6 b–d are detailed enlarged views of the micro damage shown in the dashed boxed areas. Comparing these pictures, it is found that the scratch groove shown in Figure 3 a has obvious tortuous features and the scratch direction has changed many times, which is not as straight as the single crystal material [ 30 ]. The scratch direction change indicates that the indenter has slipped.…”

Section: Resultsmentioning

confidence: 99%

“…In the nanoscratching test, the scratch directions for Berkovich indenter include the edge-forward mode, the side-face forward mode, and the face-forward mode [ 34 ]. The existing model for predicting the penetration depth taking strain rate into account was only in the face-forward mode [ 30 ]. In our study, we adopted the edge forward mode, as shown in Figure 1 , which greatly reduced the influence of the indenter spherical tip on the scratch direction change.…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, the penetration depth of the indenter is also related to the actual contact area between the indenter and workpiece during the scratching process. The real shape of a standard Berkovich indenter is a spherical crown with a radius of about 100 nm [ 30 ]. In this scratching test, the penetration depths are much larger than the radius of the Berkovich indenter.…”

Section: Discussionmentioning

confidence: 99%

“…Yang et al [ 29 ] have performed scratch tests on glass-ceramics using different speeds to explore the relationship between scratch speed and subsurface damage degree, indicating that increasing scratch speeds may inhibit the propagation of the median cracks and reduce the subsurface damage. Li et al [ 30 ] have used a scanning electron microscope to analyze the effect of scratch speed on the scratch grooves and chips morphology of Gd 3 Ga 5 O 12 (GGG) crystal, showing that higher scratch speed was beneficial to the formation of larger continuous chips. To sum up, the effect of strain rates induced by scratch speeds on deformation characteristics and damage mechanisms cannot be ignored.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Strain Rate on the Deformation Characteristic of AlN Ceramics under Scratching

Gao

Kang

et al. 2021

Micromachines

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To clarify the influence mechanism of strain rate effect on deformation characteristics of aluminum nitride (AlN) ceramics, some varied-velocity nanoscratching tests were carried out using a Berkovich indenter in this paper. The deformation characteristics of the scratched grooves were observed using the scanning electron microscope. The experimental results showed higher scratch speed would lead to shallower penetration depth, fewer cracks, and indenter fewer slipping, which was more conducive to the plastic deformation of AlN ceramics. Considering the strain rate effect and the elastic recovery of material, a model for predicting the Berkovich indenter penetration depth under edge-forward mode was established. The prediction results were consistent with the experimental data, and the error was less than 5%, indicating that the model is effective. Based on the Boussinesq field, the Cerruti field, and the Sliding bubble field, a strain rate dependent scratch stress field model was established. The stress field revealed higher scratch speed may significantly reduce the maximum principal stress in the stress field under the indenter, which is the fundamental reason for reducing the crack damage and promoting the plastic deformation. The above study can provide theoretical guidance for reducing the processing damage of AlN ceramics.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Strain Rate on the Deformation Characteristic of AlN Ceramics under Scratching

Gao

Kang

et al. 2021

Micromachines

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“…Under the higher normal load of 20 mN, the differences in size and morphology of wear debris were more distinct, shown in Figure 6.24. The wear debris changed from ductile chips to brittle chips generated by crack propagation [201]. In 1 rGO + 1 CNT composite, large rGO and CNT were observed in wear debris.…”

Section: Microstructural Characterizationmentioning

confidence: 99%

Fabrication and characterization of graphene and carbon nanotube reinforced bioceramic nanocomposites

Hu¹

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First of all, I would like to express my sincere gratitude to my supervisor, Prof. Khor Khiam Aik, and my co-supervisor, Assoc. Prof. Li Hua for their continuum guidance and encouragement during the past years. Thank you Prof. Khor for your insightful comments and advice that the meetings and discussions with you always give me a lot of thinking and inspirations. You not only help me touch deeper knowledge in the present research area, but also taught me life truths that will be beneficial for my life.Thank you Prof. Li for keeping me on the track.Besides my supervisors, I would like to thank my Thesis Advisory Committee members, Assoc. Prof. Dong Zhili and Assoc. Prof. Su Peichen for their valuable comments and encouragements.

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Optical, Structural, and Mechanical Properties of Gd₃Ga₅O₁₂ Single Crystals Irradiated with ⁸⁴Kr⁺ Ions

Karipbayev

Kumarbekov

Manika

et al. 2022

Physica Status Solidi (b)

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Herein, the optical absorption, X‐ray diffraction (XRD) analysis data, and mechanical properties along the ion path are analyzed for gadolinium gallium garnet (Gd3Ga5O12 or GGG) single crystals irradiated with fast 84Kr ions to fluences of 1013–1014 ion cm−2. It is found that the optical absorption spectra of Czochralski‐grown unirradiated GGG crystal consist of relatively narrow lines in the UV spectral range associated with the 4f–4f transitions in Gd3+ ions. Transitions from the 6S7/2 ground state to the 6P, 6J, and 6D states in the Gd3+ cation are visible. An additional absorption band is also observed at 350 nm, which is associated with an uncontrolled Ca impurity. In irradiated GGG single crystals, a shift of the fundamental absorption edge by ≈30 nm to the long‐wavelength part of the spectrum is observed. The observed changes are caused by structural disturbances caused by depletion of the surface layer and an increase in the number of displaced atoms accompanied by an increase in the crystal lattice parameter. XRD analysis shows the presence of size effects and deformation of interplanar distances due to the displacement of atoms from the sites of the crystal lattice with subsequent migration. Hardness measurements show ion‐induced softening, which may be due to ion‐induced amorphization.

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Strain-rate dependence of surface/subsurface deformation mechanisms during nanoscratching tests of GGG single crystal

Cited by 42 publications

References 50 publications

Effect of Strain Rate on the Deformation Characteristic of AlN Ceramics under Scratching

Effect of Strain Rate on the Deformation Characteristic of AlN Ceramics under Scratching

Fabrication and characterization of graphene and carbon nanotube reinforced bioceramic nanocomposites

Optical, Structural, and Mechanical Properties of Gd₃Ga₅O₁₂ Single Crystals Irradiated with ⁸⁴Kr⁺ Ions

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Strain-rate dependence of surface/subsurface deformation mechanisms during nanoscratching tests of GGG single crystal

Cited by 42 publications

References 50 publications

Effect of Strain Rate on the Deformation Characteristic of AlN Ceramics under Scratching

Effect of Strain Rate on the Deformation Characteristic of AlN Ceramics under Scratching

Fabrication and characterization of graphene and carbon nanotube reinforced bioceramic nanocomposites

Optical, Structural, and Mechanical Properties of Gd3Ga5O12 Single Crystals Irradiated with 84Kr+ Ions

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Optical, Structural, and Mechanical Properties of Gd₃Ga₅O₁₂ Single Crystals Irradiated with ⁸⁴Kr⁺ Ions