Oscillatory Pressure Sintering Enables Low-Strain Grain Boundaries in High-Entropy Carbides

IF 4.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Journal of the American Ceramic Society Pub Date : 2026-10-26 DOI:10.1111/jace.71341

Yujie Zhu, Wei Xie, Mingliang Li, Xiaohang Yin, Wei Li, Cheng Fang, Bo Song, Kehao Zhang, Li Guan, Hailong Wang

引用次数: 0

Abstract

High-entropy carbides (HECs) are promising ultra-high-temperature ceramics but suffer from poor sinterability, residual stress, and grain boundary defects. Conventional hot pressing (HP) cannot simultaneously achieve full densification and homogeneous lattice strain. We report a strain-engineering strategy using oscillatory pressure sintering (OPS) at 1800°C to prepare (Zr,Mo,Ti,Nb,Ta)C with low-strain grain boundaries. OPS yields near-full densification (99.64%), uniform elemental distribution, and a strain range of −1.5% to +1.5%, narrower than HP (−9% to +15%), eliminating stress concentration. The microstructure exhibits hardness of 25.18±0.38 GPa and toughness of 3.54±0.23 MPa·m^1/2. OPS homogenizes lattice strain, stabilizes grain boundaries, and enhances properties, offering a route to high-performance HECs.

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振荡压力烧结实现高熵碳化物的低应变晶界

高熵碳化物是一种极具发展前景的超高温陶瓷材料，但存在烧结性能差、残余应力和晶界缺陷等问题。传统热压（HP）不能同时实现完全致密化和均匀的晶格应变。我们报道了一种在1800℃下使用振荡压力烧结（OPS）制备具有低应变晶界的（Zr,Mo,Ti,Nb,Ta）C的应变工程策略。OPS具有接近完全致密化（99.64%），元素分布均匀，应变范围为- 1.5% ~ +1.5%，比HP（- 9% ~ +15%）窄，消除了应力集中。显微组织硬度为25.18±0.38 GPa，韧性为3.54±0.23 MPa·m1/2。OPS使晶格应变均匀化，晶界稳定，性能增强，为高性能hec提供了一条途径。

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

期刊介绍： The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.