A facile fine-grain strategy to fabricate (Ta0.2Nb0.2Ti0.2Hf0.2Zr0.2)C-SiC ceramics with enhanced strength and toughness

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2025-02-25 DOI:10.1016/j.msea.2025.148125

Tianzhan Shen, Cuiyan Li, Haibo Ouyang, Mengyao He, Yanlei Li, Leer Bao, Jintao Wang, Zihao Chen, Jiaqi Liu, Xinzi Zhong

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引用次数: 0

Abstract

(Ta_0.2Nb_0.2Ti_0.2Hf_0.2Zr_0.2)C high-entropy ceramic (HEC) is a potential candidate material for use in extreme environments. However, improving HEC ceramics' toughness is a great challenge. In this study, a facile fine-grain method has been used to fabricate the HEC-SiC ceramics with enhanced strength and toughness. The influence of SiC particle size in the densification, microstructure, and mechanical properties of the HEC-SiC ceramics was studied. With the addition of fine SiC particles (HS-0.5 sample), its relative density increases from 91.23 % to 97.19 %, and the HEC phase shows a reduction in grain size from 3.48 to 0.83 μm on average, compared with the monolithic HEC ceramics (HS-0 sample). Additionally, the HEC phase exhibits an increased lattice distortion from 0.044 % to 0.151 % with the addition of SiC fine particles. The HS-0.5 sample exhibits superior mechanical properties with a fracture toughness of 5.48 MPa m^1/2, a Vickers hardness of 26 GPa, and a flexural strength of 530 MPa, which is 56.1 %, 44.4 %, and 60.1 % higher than that of the monolithic HEC ceramics. This encouraging enhancement of hardness, toughness, and strength of HEC-SiC ceramics is ascribed to the improvement of ceramics sintering, fine-grain strengthening, solid solution strengthening, and particle toughening by the fine SiC particles.

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.