Stacking faults toughened SiC ceramics formed by FSPS induced grain deformation

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2025-05-03 DOI:10.1016/j.jeurceramsoc.2025.117499

Jian Zhao , Zhitong Xu , Zefan Yan, Bowen Li, Malin Liu, Xu Yang, Jiaxing Chang, Hao Yu, Yu Yang, Youlin Shao, Bing Liu, Rongzheng Liu

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Abstract

This study innovatively combines flash spark plasma sintering (FSPS) with aluminum (Al) sintering additive to introduce high-density stacking faults (SFs) and nanotwins into macroscopic SiC ceramic bulk through lattice doping and plastic deformation, thus breaking the "strength-toughness" dilemma. The experiments show that the fracture toughness of the ceramic reaches 12.77 MPa·m^1/2and the flexural strength reaches 696.76 MPa, which are 3–4 times and twice as high as those of the spark plasma sintering (SPS) samples under the same conditions, respectively. The mechanism indicates that Al diffuses into the SiC lattice under electric field drive, promoting low-temperature densification and inducing grain deformation to generate SFs, thereby enhancing toughness through nanoscale crack deflection and multi-level energy dissipation. This method provides a new paradigm for the strengthening and toughening of covalent ceramics, enabling the achievement of high toughness while maintaining high strength, and has the potential to be extended to other ceramic systems.

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FSPS诱导晶粒变形形成的层错增韧SiC陶瓷

本研究创新性地将闪现火花等离子烧结（FSPS）与铝（Al）烧结添加剂相结合，通过晶格掺杂和塑性变形将高密度层错（SFs）和纳米孪晶引入宏观SiC陶瓷体中，从而打破了“强度-韧性”困境。实验表明，该陶瓷的断裂韧性达到12.77 MPa·m1/2，抗弯强度达到696.76 MPa，分别是同等条件下放电等离子烧结（SPS）试样的3-4倍和2倍。机理表明，Al在电场驱动下扩散到SiC晶格中，促进低温致密化并诱导晶粒变形生成SFs，从而通过纳米级裂纹挠曲和多级能量耗散增强韧性。该方法为共价陶瓷的强化和增韧提供了一种新的范例，能够在保持高强度的同时实现高韧性，并具有推广到其他陶瓷体系的潜力。

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

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.