Effect of matrix microstructure on micro- and macro-mechanical properties of 2.5D woven oxide fiber reinforced oxide matrix composites

IF 6.5 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications Pub Date : 2024-11-12 DOI:10.1016/j.coco.2024.102159

Xiaofei Chen , Xinyuan Lv , Haitao Liu , Ru Jiang , Xun Sun

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引用次数: 0

Abstract

A comprehensive learning of the mechanical behavior change mechanism of oxide/oxide composites is of great significance as a guide for their industrial applications. This study focused on examining how matrix microstructure impacted the micro- and macro-mechanical properties of the composites mainly by nanoindentation tests, macro-mechanical tests and x-ray computed tomography. The results showed that the sintering phenomenon of matrix sintered at 1200 °C was more obvious, and there were visible transverse and longitudinal cracks. The in-situ modulus of matrix and interfacial shear modulus of the composite increased by 61.1 % and 36.4 %, respectively, with the increase of matrix sintering densification. Combined with these micro-mechanical parameters of the composites, the He-Hutchinson model predicted the same crack propagation modes as those obtained from fracture toughness tests. Moreover, more matrix cracks directly led to a 45.4 % reduction in the flexural strength of the composites sintered at 1200 °C compared to that sintered at 1100 °C. In addition, a comparison analysis was conducted on the evolution of microstructure, micro- and macro-mechanical properties of 2.5D and 2D composites with the same preparation parameters.

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基体微结构对 2.5D 氧化物纤维增强氧化物基复合材料微观和宏观力学性能的影响

全面了解氧化物/氧化物复合材料的力学行为变化机理对其工业应用具有重要指导意义。本研究主要通过纳米压痕测试、宏观力学测试和 X 射线计算机断层扫描来研究基体微观结构如何影响复合材料的微观和宏观力学性能。结果表明，在 1200 °C 下烧结的基体烧结现象更为明显，出现了明显的横向和纵向裂纹。随着基体烧结致密化程度的增加，复合材料的基体原位模量和界面剪切模量分别增加了 61.1% 和 36.4%。结合复合材料的这些微观力学参数，He-Hutchinson 模型预测了与断裂韧性测试结果相同的裂纹扩展模式。此外，更多的基体裂纹直接导致 1200 °C 烧结的复合材料的抗弯强度比 1100 °C 烧结的复合材料降低了 45.4%。此外，在制备参数相同的情况下，还对 2.5D 和 2D 复合材料的微观结构、微观和宏观力学性能的演变进行了对比分析。

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

Composites Communications Materials Science-Ceramics and Composites

CiteScore

12.10

自引率

10.00%

发文量

340

审稿时长

36 days

期刊介绍： Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.