Haoran Zou, Wen Zhang, Jinyong Zhang, Lin Ren, Weimin Wang, Fan Zhang, Bin Li, Zhengyi Fu
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引用次数: 0
摘要
通过结合晶格畸变诱导强化、纹理强化和第二相颗粒强化，开发了基于 MAX 相的高性能复合材料，以克服 MAX 相固有的低硬度和低强度问题。采用 1350°C 下 70 分钟的火花等离子烧结法制备了不同 Al2O3 含量的纹理高熵 M4AlC3/Al2O3（M = Ti、V、Mo、Nb、Ta）复合材料。对不同成分的所有样品的微观结构进行了详细表征。研究发现，随着 Al2O3 含量的增加，高熵 M4AlC3 相的晶粒尺寸逐渐减小，Al2O3 的聚集现象变得更加严重。在此基础上，测试了所有复合材料的密度、硬度、强度和断裂韧性。结果表明，所有纹理复合材料的性能都表现出明显的各向异性，其中高熵 M4AlC3/15 vol%Al2O3 复合材料的综合性能最好。此外，还系统地讨论了性能改善的机理。这项工作为后续制备高性能 MAX 相基复合材料提供了重要参考。
Microstructure and mechanical properties of textured high-entropy M₄AlC₃/Al₂O₃ (M = Ti, V, Mo, Nb, Ta) composites
High-performance MAX phase-based composites were developed to overcome the inherent low hardness and low strength of MAX phases by combining lattice distortion-induced strengthening, texture strengthening, and second-phase particle strengthening. Textured high-entropy M4AlC3/Al2O3 (M = Ti, V, Mo, Nb, Ta) composites with different Al2O3 contents were prepared using spark plasma sintering at 1350°C for 70 min. The microstructures of all samples with different compositions were characterized in detail. It was found that as the Al2O3 content increased, the grain size of the high-entropy M4AlC3 phase gradually decreased, and the aggregation of Al2O3 became more severe. Based on this, the density, hardness, strength, and fracture toughness of all composites were tested. The results indicate that all textured composites exhibit significant anisotropy in their properties, with the high-entropy M4AlC3/15 vol%Al2O3 composite showing the best overall performance. Additionally, the mechanism of performance improvement was systematically discussed. This work provides an important reference for the subsequent preparation of high-performance MAX phase-based composites.
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[...]
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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.
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