Vitreous silica formation within shear bands in a dynamically compacted granular crystalline α‐quartz

Wereszczak, Andrew A.; Parish, Chad M.; Ghezawi, Emily F.; Lance, Michael J.; Calzada, Sabrina E.; Forrest, Dean C.

doi:10.1111/ijag.16704

Vitreous silica formation within shear bands in a dynamically compacted granular crystalline α‐quartz

Journal Article · Thu Apr 10 00:00:00 EDT 2025 · International Journal of Applied Glass Science

DOI:https://doi.org/10.1111/ijag.16704· OSTI ID:2573466

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Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States)

A shear band is a heterogeneous, narrow seam within a solid material whose formation is caused by intense localized shearing when a sufficiently large amount of deformation occurs. If that deformation occurs at a sufficiently rapid rate, with operative friction, then co‐located ephemeral heating will occur in the shear band. In this study, shear bands were produced from dynamic shear‐induced compaction of a granular form of crystalline α‐quartz (SiO₂). The produced shear bands were approximately 25‐µm thick and were examined with scanning electron microscopy/electron backscatter diffraction, transmission electron microscopy, Raman spectroscopy, and nanoindentation. Further, they were found to contain a mixture of vitreous silica and small‐sized crystallites. This finding is significant because the presence of the vitreous silica within the shear band is a postmortem indicator that the localized temperature had reached or exceeded the melting temperature (∼1723°C) of crystalline SiO₂ during the rapid shear and compaction and then sufficiently rapid cooling quenched in that vitreous state.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2573466

Journal Information:: International Journal of Applied Glass Science, Journal Name: International Journal of Applied Glass Science Journal Issue: 3 Vol. 16; ISSN 2041-1294; ISSN 2041-1286

Publisher:: American Ceramic SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

36 MATERIALS SCIENCE
dynamic compaction
shear band
transmission electron microscopy
vitreous silica
α-quartz

Vitreous silica formation within shear bands in a dynamically compacted granular crystalline α‐quartz

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