Crack-resistant glass with high shear band density

Gross, Timothy M.; Wu, Jingshi; Baker, David E.; Price, James J.; Yongsunthon, Ruchirej

doi:10.1016/j.jnoncrysol.2018.04.048

Cited by 37 publications

(52 citation statements)

References 14 publications

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“…When L SR is relatively high (>20%), the variation in CR values increases, suggesting that other factors may also influence the resistance to indentation cracking. For example, recent work has shown that the density of shear bands in calcium aluminoborosilicate glasses with similar extent of densification affects the value of CR …”

Section: Discussionmentioning

confidence: 99%

Indentation cracking and deformation mechanism of sodium aluminoborosilicate glasses

et al. 2019

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Developing less brittle oxide glasses is a grand challenge in the field of glass science and technology, as it would pave the way toward new glass applications and limit the overall raw material usage and energy consumption. However, in order to achieve this goal, more insight into the correlation between the chemical composition and material properties is required. In this work, we focus on the mechanical properties of quaternary sodium aluminoborosilicate glasses, wherein systematic changes in glass chemistry yield different resistances to indentation crack initiation. We discuss the origin of the composition dependence of indentation cracking based on an evaluation of the deformation mechanism taking place during the indentation event. To this end, we use a simple metric, the extent of indent side length recovery upon annealing, to quantify the extent of reversible volume deformation. Finally, we also compare the compositional trend in crack initiation resistance to that in crack growth resistance (fracture toughness), showing no simple correlation among the two.

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Section: Discussionmentioning

confidence: 99%

Indentation cracking and deformation mechanism of sodium aluminoborosilicate glasses

et al. 2019

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“…[17] The radial cracks occur because of residual stresses stored around the deformation zone during indentation, [17,18] so much research has been concentrated on designing compositions that facilitate local densification underneath the indenter as an effective means of stress-dissipation. [21][22][23] Glasses with strong oxide bonds may also exhibit [21][22][23] Glasses with strong oxide bonds may also exhibit…”

Section: Doi: 101002/advs201901281mentioning

confidence: 99%

“…[25] This significant advancement is made possible based on the following four principles for glass composition design. [22] For this purpose, Cs is an ideal choice due to its highly ionic bonds with oxygen. [14] To fulfill this criterion, aluminum and boron will be ideal network formers unlike, e.g., silicon.…”

Section: Introductionmentioning

confidence: 99%

“…First, the composition should include the network-forming ions that can coordinate with more oxygen anions under stress, which allows them to dissipate the mechanical work stored during a contact event, and thereby to reduce the crack probability. [2] Third, the composition should have a network modifier/former ratio that limits the number of nonbridging oxygens, [22] yet preserves good glass-forming ability. [28] Second, to further lower the residual stress upon contact loading, the shear-induced plasticity should also be promoted.…”

Section: Introductionmentioning

confidence: 99%

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Breaking the Limit of Micro‐Ductility in Oxide Glasses

et al. 2019

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Oxide glasses are one of the most important engineering and functional material families owing to their unique features, such as tailorable physical properties. However, at the same time intrinsic brittleness has been their main drawback, which severely restricts many applications. Despite much progress, a breakthrough in developing ultra‐damage‐resistant and ductile oxide glasses still needs to be made. Here, a critical advancement toward such oxide glasses is presented. In detail, a bulk oxide glass with a record‐high crack resistance is obtained by subjecting a caesium aluminoborate glass to surface aging under humid conditions, enabling it to sustain sharp contact deformations under loads of ≈500 N without forming any strength‐limiting cracks. This ultra‐high crack resistance exceeds that of the annealed oxide glasses by more than one order of magnitude, making this glass micro‐ductile. In addition, a remarkable indentation behavior, i.e., a time‐dependent shrinkage of the indent cavity, is demonstrated. Based on structural analyses, a molecular‐scale deformation model to account for both the ultra‐high crack resistance and the time‐dependent shrinkage in the studied glass is proposed.

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“…On the other hand, similar deformation processes of structural compaction and shear occur in both normal and lateral indentation . On a more general perspective, the tribological properties of glasses display an enormous compositional variability . However, despite their enormous practical relevance, the present understanding of phenomena such as scratch‐induced micro‐cracking or abrasive wear remains largely phenomenological .…”

Section: Introductionmentioning

confidence: 99%

Scratch‐induced yielding and ductile fracture in silicate glasses probed by nanoindentation

et al. 2019

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Lateral nanoindentation provides access to the scratch hardness of glass surfaces. The specific sensitivity of the scratching experiment to surface mechanical properties can be enhanced when the local load at the tip apex is reduced. Here, we report on ramp‐load scratch tests on a range of silicate glasses using a sphero‐conical tip shape. Similar as with regular scratching experiments using sharp indenters, such tests create a sequence of micro‐ductile, micro‐cracking, and micro‐abrasive regimes. Detailed investigation of the indenter displacement h and of the lateral force FL as recorded in situ, however, reveals pronounced deviations in comparison to Vickers or Berkovich scratching experiments. Most notably, this includes an abrupt increase in both h and FL at moderate normal load, marking the onset of ductile fracture, and a yield point at the transition from fully elastic deformation to the elastic‐plastic regime at low load. For the range of examined silicate glasses, we find that structural cohesion controls yielding, whereas scratch‐induced fracture and micro‐abrasion are dominated by the volume density of bond energy.

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Crack-resistant glass with high shear band density

Cited by 37 publications

References 14 publications

Indentation cracking and deformation mechanism of sodium aluminoborosilicate glasses

Indentation cracking and deformation mechanism of sodium aluminoborosilicate glasses

Breaking the Limit of Micro‐Ductility in Oxide Glasses

Scratch‐induced yielding and ductile fracture in silicate glasses probed by nanoindentation

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