Structure and mechanical properties of high-entropy carbide (Ti0.2Zr0.2Nb0.2Ta0.2Cr0.2)C: Effect of sintering method

IF 1.7 4区物理与天体物理 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

AIP Advances Pub Date : 2025-09-01 DOI:10.1063/5.0283206

Wenjie Guo, Jin You, Yanrong Li, Yilong Pan, Tian Cui

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引用次数: 0

Abstract

High-entropy carbide ceramics (HECCs) have attracted increasing attention for extreme-environmental applications due to their unique multi-elemental compositions and outstanding mechanical properties. While most existing studies focus on IVB and VB transition metals synthesized via spark plasma sintering (SPS), group VIB elements, such as Cr, have been comparatively less studied. In this study, a Cr-containing HECC, (Ti0.2Zr0.2Nb0.2Ta0.2Cr0.2)C, was synthesized via both high temperature and high pressure (HTHP) sintering and SPS. Comparative analysis revealed that HTHP processing at 5 GPa and 1600 °C produced ultrafine grains (∼0.41 μm), moderate density (94.2%), and enhanced fracture toughness (5.05 ± 0.37 MPa m1/2). In contrast, SPS at 1800 °C yielded near-theoretical density (99.4%) and higher nanohardness (34.15 ± 0.51 GPa) but resulted in significant grain coarsening (∼6.24 μm) and reduced fracture toughness (∼3.5 MPa m1/2). These findings highlight the distinct structure–property relationships governed by the sintering route and provide insights into tailoring HECC performance for demanding service conditions.

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高熵碳化物（Ti0.2Zr0.2Nb0.2Ta0.2Cr0.2）C的组织与力学性能：烧结方法的影响

高熵碳化物陶瓷（HECCs）由于其独特的多元素组成和优异的力学性能，在极端环境应用中受到越来越多的关注。现有的研究大多集中在火花等离子烧结（SPS）合成的IVB和VB过渡金属上，而对VIB族元素如Cr的研究相对较少。本研究通过高温高压（HTHP）烧结和SPS合成了一种含cr的HECC (Ti0.2Zr0.2Nb0.2Ta0.2Cr0.2)C。对比分析表明，在5 GPa和1600°C高温高温下处理后的合金可获得超细晶粒（~ 0.41 μm）、中等密度（94.2%）和增强的断裂韧性（5.05±0.37 MPa m1/2）。相比之下，在1800°C时，SPS产生了接近理论的密度（99.4%）和更高的纳米硬度（34.15±0.51 GPa），但导致明显的晶粒粗化（~ 6.24 μm）和断裂韧性降低（~ 3.5 MPa m1/2）。这些发现强调了由烧结路线决定的独特结构-性能关系，并为根据苛刻的使用条件定制HECC性能提供了见解。

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

AIP Advances NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

2.80

自引率

6.20%

发文量

1233

审稿时长

2-4 weeks

期刊介绍： AIP Advances is an open access journal publishing in all areas of physical sciences—applied, theoretical, and experimental. All published articles are freely available to read, download, and share. The journal prides itself on the belief that all good science is important and relevant. Our inclusive scope and publication standards make it an essential outlet for scientists in the physical sciences. AIP Advances is a community-based journal, with a fast production cycle. The quick publication process and open-access model allows us to quickly distribute new scientific concepts. Our Editors, assisted by peer review, determine whether a manuscript is technically correct and original. After publication, the readership evaluates whether a manuscript is timely, relevant, or significant.

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