Raman Microspectroscopic Characterization of Amorphous Silica Plastic Behavior

Chateauminois, A.; Vandembroucq, Damien; Barthel, Étienne; Martinez, V.; Grosvalet, Laurent; Martinet, C.; Champagnon, B.

doi:10.1111/j.1551-2916.2005.00747.x

Cited by 128 publications

(180 citation statements)

References 28 publications

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“…Moreover, no hardening is taken into account in this constitutive equation. Even if the relevance of hardening in metallic glasses is still a matter of discussion [11], the existence of a hardening effect has been clearly established in the case of silica [7]. To overcome these limitations, we propose in the following a new constitutive equation.…”

Section: Constitutive Modelling Of Amorphous Silicamentioning

confidence: 99%

“…Recently, Perriot et al [7] used Raman micro-spectroscopy to estimate indentationinduced densification in silica. The micrometric spatial resolution of this technique allowed them to perform a mapping of the permanent densification below an indentation imprint.…”

Section: Constitutive Modelling Of Amorphous Silicamentioning

confidence: 99%

“…In that respect glasses do not differ from standard materials, except that the characteristic length scale below which volume deformation (plasticity) is energetically more favorable than surface creation (crack propagation) is smaller [3]. Although known for half a century [4] and of primary interest for many micron-scale applications, the plasticity of silicate glasses has up to now remained little studied [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Perriot et al [7] provided a map of the local indentation-induced densification in a fused silica sample. The latter was obtained from Raman microspectroscopic mappings [20] on cross-sections of indents.…”

Section: Introductionmentioning

confidence: 99%

“…Then, the identification of the material parameters is carried out using instrumented indentation results. Finally the relevance of the new criterion is assessed by comparison with the experimental density maps [7,24].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Mechanical modelling of indentation-induced densification in amorphous silica

et al. 2008

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Section: Constitutive Modelling Of Amorphous Silicamentioning

confidence: 99%

Section: Constitutive Modelling Of Amorphous Silicamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical modelling of indentation-induced densification in amorphous silica

et al. 2008

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In situ tensile testing of silica glass membranes in the TEM

Mačković¹,

Stara²,

Przybilla³

et al. 2016

European Microscopy Congress 2016: Proceedings

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Increasing research on strength of glasses, which was greatly influenced by Griffith [1], has spawn strengthening strategies such as topological engineering [2]. Pioneering works by Takamori and Tomozawa [3], and Brückner [4] on cooling of glass melts under load and introducing structural anisotropy into the glass structure have been followed by strengthening of glasses by targeted mechanically‐induced structural anisotropy [5]. Moderate electron beam (e‐beam) irradiation has been exploited to induce enormous ductility and superplasticity into nanoscale silica spheres and wires, and was shown to affect their mechanical response [6‐8]. It is, however, not yet known whether e‐beam irradiation in combination with tensile loading can lead to anisotropic glasses, and how this affects their mechanical properties. Recently we have reported that e‐beam‐assisted quenching under load inside the transmission electron microscope (TEM) alters the mechanical properties of nanoscale silica spheres and attributed this to compression‐induced structural anisotropy [9]. Here we transfer this approach to tensile loading of nanoscale silica membranes. Tensile specimens are prepared with the focused ion beam (FIB) from commercially available silica membranes (Plano GmbH) on push‐to‐pull (PTP) devices (Fig. 1). Raman spectroscopy was performed to investigate the structure of silica membranes and damage induced by FIB (Fig. 2). Raman spectra show that as‐received membranes exhibit a structure of vitreous silica [10,11]. After Ga‐irradiation in the FIB densification of the membranes occurs, while the membranes still maintain the character of vitreous silica. In situ tensile experiments are carried out with the Hysitron PI95 TEM Picoindenter TM inside of a Titan 3 Themis 300. To achieve mechanical quenching inside the TEM moderate e‐beam irradiation is used to mimic temperature, while the e‐beam is switched off during elongation of the silica membrane. While the deformation of silica under e‐beam irradiation is superplastic [6], the sudden absence of the e‐beam during tension (quenching point) translates the deformation from superplastic to elastic (see Fig. 3a)), and finally leads to fracture. The Young's modulus E = 73 GPa of the membrane drawn at beam‐off conditions (Fig. 3b)) almost matches the value known for bulk fused silica [12], while the value of the membrane quenched under load ( E = 78 GPa) is slightly increased. The tensile strength is in the range of values known from silica glass fibers with comparable dimensions [13], but clearly exceeds values known for microscale silica glass fibers [5]. Finally, we demonstrate how to directly track structural changes in silica glass during in situ tensile experiments in TEM by in situ electron diffraction. The unique combination of in situ electron diffraction with tensile experiments in TEM enables direct relation of structural changes in silica glass to quantitative nanomechanical data.

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Local Deformation of Glasses is Mediated by Rigidity Fluctuation on Nanometer Scale

et al. 2018

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Microscopic deformation processes determine defect formation on glass surfaces and, thus, the material's resistance to mechanical failure. While the macroscopic strength of most glasses is not directly dependent on material composition, local deformation and flaw initiation are strongly affected by chemistry and atomic arrangement. Aside from empirical insight, however, the structural origin of the fundamental deformation modes remains largely unknown. Experimental methods that probe parameters on short or intermediate length‐scale such as atom–atom or superstructural correlations are typically applied in the absence of alternatives. Drawing on recent experimental advances, spatially resolved Raman spectroscopy is now used in the THz‐gap for mapping local changes in the low‐frequency vibrational density of states. From direct observation of deformation‐induced variations on the characteristic length‐scale of molecular heterogeneity, it is revealed that rigidity fluctuation mediates the deformation process of inorganic glasses. Molecular field approximations, which are based solely on the observation of short‐range (interatomic) interactions, fail in the prediction of mechanical behavior. Instead, glasses appear to respond to local mechanical contact in a way that is similar to that of granular media with high intergranular cohesion.

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Raman Microspectroscopic Characterization of Amorphous Silica Plastic Behavior

Cited by 128 publications

References 28 publications

Mechanical modelling of indentation-induced densification in amorphous silica

Mechanical modelling of indentation-induced densification in amorphous silica

In situ tensile testing of silica glass membranes in the TEM

Local Deformation of Glasses is Mediated by Rigidity Fluctuation on Nanometer Scale

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