New insights into the indentation size effect in silicate glasses
New insights into the indentation size effect in silicate glasses
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DOI：
10.1016/j.jnoncrysol.2019.119494
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发表时间：
2019-10
影响因子：
3.5
通讯作者：
Maryam Kazembeyki;M. Bauchy;C. Hoover
中科院分区：
文献类型：
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作者：
Maryam Kazembeyki;M. Bauchy;C. Hoover
当玻璃抵抗永久变形时，对于挡风玻璃或触摸屏设备盖等应用，了解它们如何响应非弹性能量耗散过程非常重要。许多玻璃表现出所谓的压痕尺寸效应（ISE），其中压痕硬度取决于施加在探针上的最大力。在这项研究中，我们在各种最大力下对二氧化硅和钠钙硅酸盐玻璃进行显微压痕，并通过奥利弗和法尔法提取维氏硬度。利用表面形貌和退火，负责耗散非弹性能量的非弹性体积被分解为致密化和塑性流动。我们表明 ISE 与这些机制密切相关。最后，我们假设 ISE 的原因是压头探针下的材料区域的塑性增加，由于高应变率和剪切稀化而导致粘度降低。
When glasses resist permanent deformations, for applications such as a windshield or the cover of a touch-screen device, it is important to understand how they respond to inelastic energy dissipation processes. Many glasses exhibit the so-called Indentation Size Effect (ISE), where the indentation hardness is dependent on the maximum force exerted on the probe. In this study, we perform microindentation on silica and soda lime silicate glasses over a wide range of maximum forces and extract the Vickers hardness by the Oliver and Pharr method. The inelastic volume responsible for dissipating the inelastic energy is decomposed into densification and plastic flow, using surface topography and annealing. We show that the ISE is intimately linked to these mechanisms. Finally, we hypothesize the cause of the ISE is an increase in plasticity in a zone of material under the indenter probe experiencing reduced viscosity due to high strain rates and shear thinning.