Crystallographic orientation effect on the polishing behavior of LiTaO3 single crystal and its correlation with strain rate sensitivity

Hang, Wei; Wei, Lanqing; Debela, Tekalign Terfa; Chen, Hongyu; Zhou, Libo; Yuan, Ju Long; Ma, Yi

doi:10.1016/j.ceramint.2021.11.324

Cited by 24 publications

(13 citation statements)

References 29 publications

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“…The indentation tip type is Berkovich with a radius of 20 nm. Elastic moduli of the specimens were determined using an ultrasonic method 36 . For this measurement, samples with two well‐ground and parallel surfaces were used.…”

Section: Methodsmentioning

confidence: 99%

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Toughening (NbTaZrW)C high‐entropy carbide ceramic through Mo doping

Zhang

et al. 2022

J Am Ceram Soc.

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Previously, we investigated the mechanical properties of a series of multi‐cation high‐entropy ceramic carbides and found that (NbTaZrW)C exhibits the best combination of nanohardness and toughness. In the current study, we explored the possibility of further hardening and/or toughening of this carbide through cation‐site Mo doping. The results show that MoC has at least 20 at.% solubility in (NbTaZrW)C. There is a tight positive relationship between average lattice distortion and mixing enthalpy; and when cation‐site Mo content is below 10 at.%, the “entropy effect” outweighs the “enthalpy effect,” leading to increased phase stability. As Mo content increases, the sacrifice of hardening is much less pronounced in comparison with that of the achievement of toughening. Quantitatively, as Mo in cation sites increases to 20 at.%, the toughness of (NbTaZrW)C is increased by ∼18%, whereas the nanohardness undergoes only ∼7% reduction. More intriguing, the 5 at.% Mo‐doped (NbTaZrW)C exhibits simultaneous improvement of nanohardness and toughness. This hardening/toughening behavior is associated with the complex and hybrid effects from lattice distortion, bonding nature as well as dislocation slip behavior. In general, this study shows the possibility of paving the way for the design and search of novel transition metal carbides with a better combination of hardness and toughness.

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Section: Methodsmentioning

confidence: 99%

“…Elastic moduli of the specimens were determined using an ultrasonic method. 36 For this measurement, samples with two well-ground and parallel surfaces were used. The thickness of the specimens was measured first, and then the time of flight was determined using a suitable acoustic transducer.…”

Section: Methodsmentioning

confidence: 99%

Toughening (NbTaZrW)C high‐entropy carbide ceramic through Mo doping

Zhang

et al. 2022

J Am Ceram Soc.

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“…Strain rate sensitivity (SRS) plays an important role in studying the plastic deformation mechanism of materials [36,[44][45][46]. Figure 6(a) exhibits the typical nanoindentation load versus displacement (P-h) curves under various strain rates for the multilayer with h = 50, as an illustration.…”

Section: Mg Mg Ti Ti Mg Timentioning

confidence: 99%

“…Nanoindentation is currently the most advanced technique in detecting mechanical responses at the micro/ nano scales during shear-compressive deformation [32]. And it nowadays has been developed to study pretty a lot of mechanical and plastic properties, e.g., creep behavior [33], fracture toughness [34], spatial modulus distribution [35], strain rate sensitivity [36] and activation volume of dislocation nucleation [37] and/or shear transformation zone [38], more than the common hardness and elastic modulus. Relying on nanoindentation, Zhu et al [39] reported room temperature creep behavior of Ag/Fe multilayers, which prepared by the electron beam evaporation deposition method.…”

Section: Introductionmentioning

confidence: 99%

Revealing thickness dependence of hardness, strain rate sensitivity, and creep resistance of nano-crystalline magnesium/titanium multilayers by nanoindentation

Ding

Song

et al. 2022

Mater. Res. Express

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The size effect on mechanical properties of hcp/hcp multilayer has been short of understanding hitherto. In this study, we prepared Magnesium/Titanium (Mg/Ti) multilayers with various individual layer thicknesses (h=50, 100, 150, 200 nm) by magnetron sputtering. Relying on nanoindentation, hardness and elastic modulus were little changed for the multilayers with h of 50~150 nm, while they were evidently lower when h increased to 200 nm. The determined strain rate sensitivities were 0.029, 0.032, 0.035, and 0.062 for the samples with h = 50, 100, 150, 200 nm, respectively. According to evolution of grain size, it suggests that Hall-Petch law dominates the strengthen effect of this hcp/hcp multilayers, rather than blocking effect of interface and decrease of dislocation content by reducing individual layer thickness. On the other hand, creep resistance was gradually promoted as reducing h. It indicates that interface and dislocation content could be important for the time-dependent plastic deformation. The room-temperature creep mechanism was discussed based on the strain rate sensitivity of steady-state creep flow. It indicates that dislocation glide could be suppressed and grain boundary glide, dislocation climb, and even interface glade could be plausible when h decreased to 50 nm.

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“…The surface quality of tungsten film will affect the interconnect performance of devices, and therefore the surface of tungsten film needs to be polished [ 8 ]. Ultra-precision polishing is the final processing method to reduce the surface roughness of workpiece, remove the damaged layer, and obtain high surface accuracy and excellent surface quality [ 9 , 10 , 11 ]. However, as a typical hard and brittle material, there are great challenges in the ultra-precision polishing of tungsten due to the high hardness, high brittleness, and great wear resistance of material [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of pH Values and H2O2 Concentrations on the Chemical Enhanced Shear Dilatancy Polishing of Tungsten

Wang

Chen

et al. 2022

Micromachines

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In order to obtain tungsten with great surface qualities and high polishing efficiency, a novel method of chemical enhanced shear dilatancy polishing (C-SDP) was proposed. The effects of pH values and H2O2 concentrations on the polishing performance of tungsten C-SDP were studied. In addition, the corrosion behaviors of tungsten in solutions with different pH values and H2O2 concentrations were analyzed by electrochemical experiments, and the valence states of elements on the tungsten surface were analyzed by XPS. The results showed that both pH values and H2O2 concentrations had significant effects on tungsten C-SDP. With the pH values increasing from 7 to 12, the MRR increased from 6.69 µm/h to 13.67 µm/h. The optimal surface quality was obtained at pH = 9, the surface roughness (Ra) reached 2.35 nm, and the corresponding MRR was 9.71 µm/h. The MRR increased from 9.71 µm/h to 34.95 µm/h with the H2O2 concentrations increasing from 0 to 2 vol.%. When the concentration of H2O2 was 1 vol.%, the Ra of tungsten reached the lowest value, which was 1.87 nm, and the MRR was 26.46 µm/h. This reveals that C-SDP technology is a novel ultra-precision machining method that can achieve great surface qualities and polishing efficiency of tungsten.

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Crystallographic orientation effect on the polishing behavior of LiTaO3 single crystal and its correlation with strain rate sensitivity

Cited by 24 publications

References 29 publications

Toughening (NbTaZrW)C high‐entropy carbide ceramic through Mo doping

Toughening (NbTaZrW)C high‐entropy carbide ceramic through Mo doping

Revealing thickness dependence of hardness, strain rate sensitivity, and creep resistance of nano-crystalline magnesium/titanium multilayers by nanoindentation

Effects of pH Values and H2O2 Concentrations on the Chemical Enhanced Shear Dilatancy Polishing of Tungsten

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