Fracture toughness measurement in fused quartz using triangular chevron-notched micro-cantilevers

Žagar, Goran; Pejchal, Václav; Mueller, Martin; Michelet, Lionel; Mortensen, Alicja

doi:10.1016/j.scriptamat.2015.09.032

Cited by 42 publications

(24 citation statements)

References 18 publications

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“…Current approaches include using a final low current milling step404142, low energy ion milling4344 or flash polishing45 in order to “clean” FIB-damaged surfaces. The techniques presented here enable 3D measurements of the complex strain fields caused by FIB-milling and would as such allow a detailed assessment of the effectiveness of these approaches.…”

Section: Discussionmentioning

confidence: 99%

3D lattice distortions and defect structures in ion-implanted nano-crystals

Hofmann

Tarleton

Harder

et al. 2017

Sci Rep

119

138

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Focussed Ion Beam (FIB) milling is a mainstay of nano-scale machining. By manipulating a tightly focussed beam of energetic ions, often gallium (Ga+), FIB can sculpt nanostructures via localised sputtering. This ability to cut solid matter on the nano-scale revolutionised sample preparation across the life, earth and materials sciences. Despite its widespread usage, detailed understanding of the FIB-induced structural damage, intrinsic to the technique, remains elusive. Here we examine the defects caused by FIB in initially pristine objects. Using Bragg Coherent X-ray Diffraction Imaging (BCDI), we are able to spatially-resolve the full lattice strain tensor in FIB-milled gold nano-crystals. We find that every use of FIB causes large lattice distortions. Even very low ion doses, typical of FIB imaging and previously thought negligible, have a dramatic effect. Our results are consistent with a damage microstructure dominated by vacancies, highlighting the importance of free-surfaces in determining which defects are retained. At larger ion fluences, used during FIB-milling, we observe an extended dislocation network that causes stresses far beyond the bulk tensile strength of gold. These observations provide new fundamental insight into the nature of the damage created and the defects that lead to a surprisingly inhomogeneous morphology.

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Section: Discussionmentioning

confidence: 99%

3D lattice distortions and defect structures in ion-implanted nano-crystals

Hofmann

Tarleton

Harder

et al. 2017

Sci Rep

119

138

View full text Add to dashboard Cite

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“…Alternative methods exist based on micropillar splitting by a sharp indenter, double cantilever splitting, or notched microcantilever, and clamped beam bending . They have been widely used and shown to deliver consistent results .…”

Section: Introductionmentioning

confidence: 99%

“…[13][14][15] The relative ease of sample preparation and experimentation is in this case balanced by the complex stress fields around the indent and their interaction with the emerging crack that complicate the analysis. 15 Alternative methods exist based on micropillar splitting by a sharp indenter, 8 double cantilever splitting, 16 or notched microcantilever, [17][18][19][20] and clamped beam bending. 21 They have been widely used 8,16,[22][23][24] and shown to deliver consistent results.…”

Section: Introductionmentioning

confidence: 99%

A new push‐pull sample design for microscale mode 1 fracture toughness measurements under uniaxial tension

Schwiedrzik

Ast

Pethő

et al. 2017

Fatigue Fract Eng Mat Struct

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A sample geometry is proposed for performing microscale tensile experiments based on a push‐pull design. It allows measuring mode 1 fracture toughness under uniform far‐field loading. Finite element simulations were performed to determine the geometry factor, which was nearly constant for Young's moduli spanning 2 orders of magnitude. It was further verified that mode 1 stress intensity factor KI is nearly constant over the width of the tension rods and an order of magnitude higher than KII and KIII. Notched samples with different a/w ratios were prepared in (100)‐oriented Si by a combination of reactive ion etching and focused ion beam milling. The mode 1 fracture toughness KI,q was constant with a/w and in average 1.02 ± 0.06 MPa√m in good agreement with existing literature. The geometry was characterized and experimentally validated and may be used for fracture toughness measurements of all material classes. It is especially interesting when a uniaxial, homogeneous stress field is desired, if crack tip plasticity is important, or when positioning of the indenter is difficult.

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“…Over the last decade, great advances have been made in understanding the small scale mechanical properties on coating systems at micron and submicron length scales by means of nanoindentation technique to bend micro-cantilevers, confined in the coating as well as in the interface, produced by focused ion beam (FIB) machining [17,18]. This technique is a miniaturized version of the conventional macroscopic methods to evaluate fracture behaviour, yielding responses close to those found for macroscopic samples [19,20,21,22,23].…”

Section: Introductionmentioning

confidence: 99%

Small scale fracture behaviour of multilayer TiN/CrN systems: Assessment of bilayer thickness effects by means of ex-situ tests on FIB-milled micro-cantilevers

Roa

Rodriguez

Lamelas

et al. 2016

Surface and Coatings Technology

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TiN/CrN multilayered PVD coatings are known to exhibit outstanding micromechanical properties and wear resistance. On the other hand, information on their small scale fracture behaviour is rather scarce. The present work aims to address it by testing to failure FIB-milled microbeams of multilayer TiN/CrN systems with different bilayer periods (8, 19 and 25 nm). In doing so, these micrometric specimens are first FIB notched, and thus deflected by means of a nanoindentation system. It is found that multilayer architecture translates into a beneficial synergic effect regarding critical load for reaching unstable failure; and thus, on energy absorption at fracture. Such behaviour is associated with small scale crack deflection as main toughening mechanism.Peer ReviewedPostprint (author's final draft

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Fracture toughness measurement in fused quartz using triangular chevron-notched micro-cantilevers

Cited by 42 publications

References 18 publications

3D lattice distortions and defect structures in ion-implanted nano-crystals

3D lattice distortions and defect structures in ion-implanted nano-crystals

A new push‐pull sample design for microscale mode 1 fracture toughness measurements under uniaxial tension

Small scale fracture behaviour of multilayer TiN/CrN systems: Assessment of bilayer thickness effects by means of ex-situ tests on FIB-milled micro-cantilevers

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