发表机构
Missouri University of Science and Technology; Pennsylvania State University; Duke University; University of California, Irvine（密苏里科技大学; 宾夕法尼亚州立大学; 杜克大学; 加州大学尔湾分校）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过实验证明，在全致密单相高熵碳化物陶瓷中，硬度不随晶粒尺寸变化，否定了Hall-Petch关系的适用性，并指出硬度由压痕载荷和基体局部响应主导。
AI 中文摘要
晶粒尺寸常与Hall-Petch关系式一起用于解释陶瓷材料硬度的差异。然而，对于全致密、单相的(Cr,Mo,Ta,V,W)C1-δ高熵碳化物陶瓷，当晶粒尺寸变化达三倍时，硬度并未随晶粒尺寸系统性地变化。晶粒尺寸从9.3±0.3微米到28.8±0.7微米的全致密单相陶瓷表现出显著的压痕尺寸效应，维氏硬度在0.49 N载荷下从约28-30 GPa降至9.81 N载荷下的约20-21 GPa，而Berkovich纳米硬度在10 mN载荷下范围为26至30 GPa。然而，在给定载荷下，硬度在整个晶粒尺寸系列中保持狭窄范围，未解析出一致的Hall-Petch依赖性。缺乏晶粒尺寸依赖性可能表明压头所采样的变形体积不受晶界相互作用的控制；相反，硬度主要由压痕载荷和岩盐结构碳化物基体的局部响应所主导。
英文摘要
Grain size is often used with the Hall-Petch relationship to justify differences in hardness in ceramic materials. Herein, hardness does not vary systematically with grain-size for fully dense, single-phase (Cr,Mo,Ta,V,W)C1-δ high entropy carbide ceramics for grain sizes that varied by a factor of three. Fully dense, single-phase ceramics with grain sizes from 9.3+/-0.3 to 28.8+/-0.7 microns exhibited a pronounced indentation size effect, with Vickers hardness decreasing from ~28-30 GPa at 0.49 N to ~20-21 GPa at 9.81 N, and Berkovich nanohardness ranging from 26 to 30 GPa at 10 mN. However, at a given load, hardness remained within a narrow range across the grain-size series, and no consistent Hall-Petch dependence was resolved. The lack of grain-size dependence likely indicates that the deformation volume sampled by the indenter was not controlled by grain-boundary interactions; instead, hardness was governed primarily by indentation load and local response of the rock salt carbide matrix.
