Thermal Stability and Strengthening Effect of Coherent Precipitates in a (FeCoNi)92Al2.5Ti5.5 High Entropy Alloy

IF 2.9 2区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Acta Metallurgica Sinica-English Letters Pub Date : 2024-06-25 DOI:10.1007/s40195-024-01727-8

Yuqi Liu, Feng Wang, Songyang Chen, Hui Wang, Zhiping Xiong, Khurram Yaqoob, Zhangwei Wang, Min Song

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Abstract

The coarsening behavior and strengthening effect of L1₂-Ni₃(Ti,Al) precipitates in a face-centered-cubic (FCC) (FeCoNi)₉₂Al_2.5Ti_5.5 high entropy alloy have been systematically investigated. The coherent L1₂ precipitates, uniformly distributed throughout the FCC matrix, consistently retain a spherical shape. The coarsening rate coefficient of precipitate is determined by employing the Philippe-Voorhees (PV) model, suggesting excellent thermal stability. Furthermore, the elemental partitioning and compositional evolution of the L1₂ precipitates is analyzed by atom probe tomography, which identify aluminum (Al) as the slowest diffusion species during the coarsening process. In addition, the precipitation strengthening effect is quantified to ascertain the optimal size of the precipitates. Our study enhances the understanding of precipitate coarsening in high entropy alloys, presenting valuable insights into their thermal stability and mechanical properties.

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(FeCoNi)92Al2.5Ti5.5高熵合金中相干沉淀的热稳定性和强化效应

我们系统地研究了面心立方 (FCC) (FeCoNi)92Al2.5Ti5.5 高熵合金中 L12-Ni3(Ti,Al)沉淀的粗化行为和强化效果。均匀分布在 FCC 基体中的相干 L12 沉淀始终保持球形。析出物的粗化率系数是通过 Philippe-Voorhees（PV）模型确定的，这表明析出物具有极佳的热稳定性。此外，原子探针断层扫描分析了 L12 沉淀的元素分配和成分演变，确定铝（Al）是粗化过程中扩散速度最慢的物种。此外，还对沉淀强化效应进行了量化，以确定沉淀的最佳尺寸。我们的研究加深了人们对高熵合金沉淀粗化的理解，为了解其热稳定性和机械性能提供了宝贵的见解。

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来源期刊

Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

6.60

自引率

14.30%

发文量

122

审稿时长

2 months

期刊介绍： This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.