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

IF 2.5 3区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Glass Science Pub Date : 2025-04-10 DOI:10.1111/ijag.16704

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

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Abstract

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. 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.

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动态压实颗粒状α-石英中剪切带内的玻璃状二氧化硅形成

剪切带是固体材料内部的非均匀窄缝，当发生足够大的变形时，其形成是由强烈的局部剪切引起的。如果这种变形以足够快的速度发生，并伴有有效摩擦，那么在剪切带中就会发生同位的短暂加热。在本研究中，剪切带是由α-石英（SiO2）颗粒状晶体的动态剪切诱导压实形成的。剪切带厚度约为25µm，并通过扫描电镜/电子背散射衍射、透射电镜、拉曼光谱和纳米压痕进行了检测。它们被发现含有玻璃状二氧化硅和小型晶体的混合物。这一发现意义重大，因为剪切带内玻璃状二氧化硅的存在是一个尸检指标，表明在快速剪切和压实过程中，局部温度达到或超过结晶二氧化硅的熔化温度（~ 1723℃），然后在该玻璃状状态下进行充分的快速冷却淬火。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Applied Glass Science MATERIALS SCIENCE, CERAMICS-

CiteScore

4.50

自引率

9.50%

发文量

审稿时长

>12 weeks

期刊介绍： The International Journal of Applied Glass Science (IJAGS) endeavors to be an indispensable source of information dealing with the application of glass science and engineering across the entire materials spectrum. Through the solicitation, editing, and publishing of cutting-edge peer-reviewed papers, IJAGS will be a highly respected and enduring chronicle of major advances in applied glass science throughout this century. It will be of critical value to the work of scientists, engineers, educators, students, and organizations involved in the research, manufacture and utilization of the material glass. Guided by an International Advisory Board, IJAGS will focus on topical issue themes that broadly encompass the advanced description, application, modeling, manufacture, and experimental investigation of glass.