The influence of precipitates on the indentation creep behavior of (CoCrFeNi)94Ti2Al4 alloy

IF 5.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2026-03-01 Epub Date: 2026-01-21 DOI:10.1016/j.intermet.2026.109169

Jiaohui Yan , Fei Hou , Lei Li , Di Wan , Xun Guo , Ke Jin , Yunfei Xue

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Abstract

This study investigates the influence of precipitate size on the room-temperature indentation creep behavior of (CoCrFeNi)₉₄Ti₂Al₄ high-entropy alloy by using nanoindentation system equipped with Berkovich diamond indenter combined with microstructural characterization. Nano-hardness, creep displacement, and creep strain rate of specimens with different sizes of nanoscale precipitates were analyzed under conditions of a 20 mN peak load and a 0.5 mN/s loading rate. Results show that precipitate refinement enhances the alloy hardness and reduces the total creep depth, while the steady-state creep rate increases slightly with an insignificant increment. When the testing conditions (loading rate and peak load) were changed, although the trend of inhibiting total creep displacement by precipitate refinement remained unchanged, the effect of precipitate refinement on the steady-state creep rate was not significant. Additionally, creep analysis using a spherical indenter were conducted to calculate the creep stress exponent n. Results showed that the precipitate-containing alloy exhibited a higher n value than the precipitate-free alloy, with dislocation creep identified as the dominant deformation mechanism in both cases. This study enables rapid screening of materials via nanoindentation creep, provides deeper mechanistic insights into the creep deformation of precipitation-strengthened high-entropy alloys, and establishes a theoretical framework for property optimization.

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析出相对（CoCrFeNi）94Ti2Al4合金压痕蠕变行为的影响

采用配备Berkovich金刚石压头的纳米压痕系统结合显微组织表征，研究了析出相尺寸对（CoCrFeNi）94Ti2Al4高熵合金室温压痕蠕变行为的影响。在峰值载荷为20 mN、加载速率为0.5 mN/s的条件下，分析了不同尺寸纳米析出物试样的纳米硬度、蠕变位移和蠕变应变率。结果表明：析出相细化提高了合金硬度，降低了总蠕变深度，而稳态蠕变速率略有增加，但增幅不显著；当试验条件（加载速率和峰值载荷）发生变化时，虽然析出相细化抑制总蠕变位移的趋势保持不变，但析出相细化对稳态蠕变速率的影响不显著。此外，利用球面压头进行蠕变分析，计算蠕变应力指数n。结果表明，含析出相合金的n值高于无析出相合金，位错蠕变是两种情况下的主要变形机制。该研究使通过纳米压痕蠕变快速筛选材料成为可能，为沉淀强化高熵合金的蠕变变形提供了更深入的机理见解，并为性能优化建立了理论框架。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.