High-temperature compressive behaviour and failure mechanism of high entropy carbides modified by Cr addition

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

Materials Science and Engineering: A Pub Date : 2024-11-09 DOI:10.1016/j.msea.2024.147532

Yichen Wang , Zanlin Cheng , Vladimír Girman , Richard Sedlák , Ján Dusza , Michael J. Reece , Chengyu Zhang

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Abstract

The effect of Cr addition on the compressive and failure behaviour of high entropy carbides (HECs) at temperatures of 1400–1600 °C and stresses of 200–300 MPa was investigated by comparing two groups of ceramics: (Zr,Nb,Hf,Ta)C (HEC4) and HEC4 with Cr addition (HEC5-Cr), and 8-metal carbides (Ti,Zr,Hf,V,Nb,Ta,Mo,X)C with W or Cr addition for X. The HEC-Cr systems showed significantly lower compressive strain than Cr-free HECs under identical conditions. HEC4 showed a strain of about 1.4 % at 1500 °C under 200 MPa for 6 h, while HEC5-Cr demonstrated only 0.05 % strain. To the best of our knowledge, HEC5-Cr exhibited the lowest steady creep rate among carbides reported under similar conditions. Creep is almost negligible in HEC-Cr ceramics, mostly because the grain boundary sliding and cracking were restricted by the strong Cr-rich grain boundaries. The Cr addition changed the failure behaviour of HECs: the Cr-free HEC samples shattered into numerous pieces due to severe grain boundary deformation, the HEC-Cr samples typically fractured into two parts with transgranular failure. The strategic addition of Cr to HECs enhances compressive performance and modifies fracture behaviour, indicating their potential as superior materials for high-stress, high-temperature applications.

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添加铬改性的高熵碳化物的高温压缩行为和失效机理

通过比较两组陶瓷：(Zr,Nb,Hf,Ta)C (HEC4)和添加了铬的 HEC4 (HEC5-Cr)，以及添加了 W 或铬的 X 的 8 金属碳化物 (Ti,Zr,Hf,V,Nb,Ta,Mo,X)C，研究了添加铬对高熵碳化物 (HEC) 在 1400-1600 °C 温度和 200-300 MPa 应力条件下的压缩和破坏行为的影响。在相同条件下，HEC-Cr 系统的压缩应变明显低于无铬 HEC。HEC4 在 1500 °C、200 兆帕持续 6 小时的条件下显示出约 1.4 % 的应变，而 HEC5-Cr 仅显示出 0.05 % 的应变。据我们所知，HEC5-Cr 在类似条件下表现出的稳定蠕变率是所报道的碳化物中最低的。HEC-Cr 陶瓷的蠕变几乎可以忽略不计，这主要是因为晶界滑动和开裂受到了富含铬的强晶界的限制。铬的添加改变了 HEC 的破坏行为：无铬 HEC 样品由于严重的晶界变形而碎裂成许多碎片，而 HEC-Cr 样品通常断裂成两部分，发生跨晶粒破坏。有策略地在 HEC 中添加铬可提高抗压性能并改变断裂行为，这表明 HEC 有可能成为高应力、高温应用领域的优质材料。

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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.