石墨烯缺陷率对其在高熵合金中增强能力的影响。

The Influence of the Defect Rate of Graphene on Its Reinforcing Capability Within High-Entropy Alloys.

作者信息

Zhang Xianhe, Wang Hongyun, Zhang Chunpei, Zhang Cun, Zhang Xuyao

机构信息

Hebei Research Center of the Basic Discipline Engineering Mechanics, Shijiazhuang Tiedao University, Shijiazhuang 050043, China.

Hebei Key Laboratory of Mechanics of Intelligent Materials and Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, China.

出版信息

Nanomaterials (Basel). 2025 Jul 30;15(15):1177. doi: 10.3390/nano15151177.

DOI:10.3390/nano15151177

PMID:40801716

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12348800/

Abstract

Graphene, a remarkable two-dimensional material, enhances the mechanical properties of high-entropy alloys as a reinforcing phase. This study investigated the influence of vacancy defects in graphene on the strengthening effect of FeNiCrCoCu high-entropy alloy through molecular dynamics simulations. The findings reveal that vacancy defects diminish graphene's strength, resulting in its premature failure. In tensile tests, graphene with defects lowers the yield stress of the composite, yet it retains the ability to impede dislocations. Conversely, graphene exhibits a more pronounced strengthening effect during compression. Specifically, when the deletion of C atoms is less than 1%, the impact is negligible; between 1% and 6%, the strengthening effect diminishes; and when it surpasses 6%, the strengthening effect virtually ceases to exist. This research offers a theoretical foundation for optimizing graphene-reinforced composites.

摘要

石墨烯是一种卓越的二维材料，作为增强相可提升高熵合金的力学性能。本研究通过分子动力学模拟，探究了石墨烯中的空位缺陷对FeNiCrCoCu高熵合金强化效果的影响。研究结果表明，空位缺陷会降低石墨烯的强度，导致其过早失效。在拉伸试验中，含有缺陷的石墨烯会降低复合材料的屈服应力，但仍保留阻碍位错的能力。相反，石墨烯在压缩过程中表现出更显著的强化效果。具体而言，当碳原子缺失量小于1%时，影响可忽略不计；在1%至6%之间时，强化效果减弱；而当超过6%时，强化效果几乎不复存在。本研究为优化石墨烯增强复合材料提供了理论基础。