Intermittent in-situ high-resolution X-ray microscopy of 400-nm porous glass under uniaxial compression: Study of pore changes and crack formation

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2024-09-26 DOI:10.1016/j.scriptamat.2024.116396

Sebastian Schäfer , François Willot , Hrishikesh Bale , Mansoureh Norouzi Rad , Stephen T. Kelly , Dirk Enke , Juliana Martins de Souza e Silva

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Abstract

Understanding the relationship between the structure of porous glasses and their failure behavior is crucial for developing reliable porous glasses for specific applications. In this study, we used nanometer resolution X-ray computed tomography (nano-CT) to image a controlled pore glass (CPG) with 400 nm-sized pores under in-situ uniaxial compression. Our results demonstrate that in-situ nano-CT is an excellent tool for identifying damage mechanisms in 400 nm pore glass. It allowed us to track changes in the shape of pores and pore walls during compression until the specimen failed. We also used computational tools to analyze the microstructural changes within the CPG sample, mapping displacements and strain fields. Additionally, we simulated the behavior of the CPG using a Fast Fourier Transform/Phase Field method. Both experimental and numerical data revealed local shear deformation occurring along bands, consistent with the appearance and propagation of ± 45-degree cracks.

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单轴压缩下 400 纳米多孔玻璃的间歇性原位高分辨率 X 射线显微镜：孔隙变化和裂纹形成研究

了解多孔玻璃的结构与其失效行为之间的关系，对于为特定应用开发可靠的多孔玻璃至关重要。在这项研究中，我们使用纳米分辨率的 X 射线计算机断层扫描（nano-CT）对具有 400 纳米大小孔隙的受控孔隙玻璃（CPG）进行了原位单轴压缩成像。我们的研究结果表明，原位纳米计算机断层扫描是确定 400 纳米孔隙玻璃损伤机制的绝佳工具。它使我们能够跟踪压缩过程中孔隙和孔壁形状的变化，直至试样失效。我们还使用计算工具来分析 CPG 样品内部的微观结构变化，绘制位移和应变场。此外，我们还使用快速傅立叶变换/相场方法模拟了 CPG 的行为。实验数据和数值数据均显示，局部剪切变形沿着带状发生，与 ± 45 度裂纹的出现和扩展相一致。

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

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.