Enhancement in nanohardness of soda–lime–silica glass

Dey, Arjun; Chakraborty, Riya; Mukhopadhyay, Anoop Kumar

doi:10.1016/j.jnoncrysol.2011.03.036

Cited by 34 publications

(34 citation statements)

References 42 publications

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“…Similar observations were also reported for glass [21][22][23][24], polycrystalline alumina [25,26,43,44], bulk metallic glasses [27][28][29], sapphire [30], GaN [31], and ZnO [32].…”

Section: Resultssupporting

confidence: 87%

“…Thus, from the aforesaid values, the average critical resolved shear stress (τ CRSS ) value was estimated as ∼1. 23 GPa for the applied load of 1 N. This value (∼1.23 GPa for 1 N) for the present coarse grain alumina was lower than those, for example, ∼2-3 GPa and ∼2. 18 GPa, reported, respectively, for single crystal sapphire [46] and nanograined α-alumina [35].…”

Section: Resultscontrasting

confidence: 62%

“…The occurrence of the pop-in behaviour was also reported for glass [21][22][23][24], polycrystalline alumina [25,26,43,44], bulk metallic glass [27][28][29], sapphire [30], GaN [31], and ZnO [32]. The occurrence of pop-in has often been associated with shear localization [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 87%

“…The effect of these deformations are revealed by the occurrence of "multiple micro-pop-in" and "multiple micropop-out" events in the load-depth plots, followed by the formation of shear deformation bands and localized microcracking in and around the indentation cavity [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] and the formation of dislocation loops in the alumina sample. The detailed mechanisms of pop-in events which occur during indentation in ceramics are far from being well understood and may be strongly sensitive to the plane bearing the nanoindentation, nanoindenter tip radius, temperature and so forth, while the microscale hardness may [38][39][40][41] or may not be [42] sensitive to strain and loading rate variation.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, significant effect of loading rate on hardness of glass [21][22][23][24] and alumina [25,26,43,44] was reported. The occurrence of the pop-in behaviour was also reported for glass [21][22][23][24], polycrystalline alumina [25,26,43,44], bulk metallic glass [27][28][29], sapphire [30], GaN [31], and ZnO [32].…”

Section: Introductionmentioning

confidence: 99%

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Contact Deformation of Alumina

Bhattacharya

Mukhopadhyay

2012

ISRN Ceramics

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The study of contact-induced deformations during hardness evaluation and the subsequent damage mechanisms of alumina under low loads deserves significant importance for its applications as wear-resistant inserts, biomedical implants, thin films, and armour plates, because the contact-induced brittle failure is an issue of major scientific concern that prevents their widespread commercial applications. However, the studies on hardness of dense, coarse grain alumina at ultralow load, for example, 1 N, are still lacking. Therefore, the present study was conducted on a dense (∼95% of theoretical) coarse-grain (∼20 μm) alumina at a low peak load of 1 N with varying loading rates (10 −3 -10 0 N·s −1 ) applied in depth sensitive indentation experiments. The results showed profuse presence of multiple micro-pop-in and pop-out events possibly linked to dislocation nucleations underneath the indenter. The critical resolved shear stress (τ CRSS ) was found to enhance with the increase in applied loading rates. The occurrences of the localized shear deformation band formation and microcracking in and around the indentation cavity were explained in terms of the correlation between the nanoscale plasticity events, the small magnitude of (τ CRSS ), the maximum shear stress (τ max ) developed just underneath the indenter, and the dislocation loop radius (R d ).

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“…Similar observations were also reported for glass [21][22][23][24], polycrystalline alumina [25,26,43,44], bulk metallic glasses [27][28][29], sapphire [30], GaN [31], and ZnO [32].…”

Section: Resultssupporting

confidence: 87%

Section: Resultscontrasting

confidence: 62%

Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Contact Deformation of Alumina

Bhattacharya

Mukhopadhyay

2012

ISRN Ceramics

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General Nature of Serration Effect in Crystals and Other Materials Under Indentation

Grabco,

Pyrtsac,

Shikimaka

2023

IFMBE Proceedings

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Nanomechanical properties inside the scratch grooves of soda–lime–silica glass

et al. 2012

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Advanced applications of glass span the range from biomedical technology to special optical lenses to mobile phones and computers. Such advanced applications demand high-precision machining, which is like multiple single scratches occurring simultaneously on the glass surface. However, in spite of the wealth of literature on scratch deformation behavior of glass there is no significant information available on whether the nanomechanical properties are affected inside the scratch grooves. Therefore, nanoindentation experiments were deliberately conducted at a fixed load of 100 mN through the scratch grooves made at various applied normal loads (5-15 N) at a constant speed of 200 µm s −1 on polished soda-lime-silica (SLS) glass slides. The results showed that depending upon the applied normal load used to generate the scratch grooves, the nanohardness and Young's modulus inside the scratch grooves decreased by about ∼30-60% from the corresponding data of the undamaged SLS glass due to the presence of subsurface shear deformation and microcracking as observed by optical, scanning and field emission scanning electron microscopy. A model for microcracked brittle solids was utilized to explain these results.

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Enhancement in nanohardness of soda–lime–silica glass

Cited by 34 publications

References 42 publications

Contact Deformation of Alumina

Contact Deformation of Alumina

General Nature of Serration Effect in Crystals and Other Materials Under Indentation

Nanomechanical properties inside the scratch grooves of soda–lime–silica glass

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