The high-toughness mechanism of heterogeneous solid solution HfC-TaC-HfO2 composite ceramics

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

Composites Communications Pub Date : 2024-09-20 DOI:10.1016/j.coco.2024.102097

Z.Y. Tan , G.N. Xu , Y.B. Peng , S.Y. Wen

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Abstract

Homogenisation and low-temperature sintering of multicomponent ultra-high temperature ceramics (UHTCs) are crucial technologies for their applications. However, the potential of utilizing the heterogeneous solid solution between UHTCs as a means of toughening has been neglected. The current work proposes a novel inhomogeneous solid solution phase composed of isomorphic HfC and TaC, which is designed to induce additional fracture energy dissipation. This phase is achieved using an ingenious powder screening method combined with the introduction of HfO₂ sintering additive. The hardness and fracture toughness of the composite ceramics reached 14.9 ± 1.3 GPa and 6.5 ± 0.4 MPa m^1/2, respectively. The toughening mechanism was studied using real two-dimensional structure stress simulation and density functional theory (DFT) calculations. Uneven valence electron concentration results in the ductile to brittle transition of Hf_1-xTa_xC. Crack deflection and bridging toughening mechanisms originate from the second phase stress of HfO₂ particles and the heterogeneous matrix. This discovery will provide a noteworthy research direction for the design of high toughness multicomponent UHTCs.

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异质固溶体 HfC-TaC-HfO2 复合陶瓷的高韧性机理

多组分超高温陶瓷（UHTC）的均质化和低温烧结是其应用的关键技术。然而，利用超高温陶瓷之间的异质固溶体作为增韧手段的潜力一直被忽视。目前的研究提出了一种由同构 HfC 和 TaC 组成的新型非均质固溶相，旨在诱导额外的断裂能量耗散。该相是通过一种巧妙的粉末筛选方法并结合 HfO2 烧结添加剂实现的。复合陶瓷的硬度和断裂韧性分别达到了 14.9 ± 1.3 GPa 和 6.5 ± 0.4 MPa m1/2。利用实际二维结构应力模拟和密度泛函理论（DFT）计算研究了增韧机理。不均匀的价电子浓度导致了 Hf1-xTaxC 从韧性到脆性的转变。裂纹偏转和桥接增韧机制源于 HfO2 颗粒和异质基体的第二相应力。这一发现将为设计高韧性多组分超高强韧性复合材料提供一个值得关注的研究方向。

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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.