Influence of Y (yttrium) doping on thermal stability of nanocrystalline AlCoCrCuFeNi high entropy alloy

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-01-15 DOI:10.1016/j.intermet.2025.108638

Koushik Sikdar , Avik Mahata , Chinmoy Chattopadhyay , Debdas Roy , Rahul Mitra

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引用次数: 0

Abstract

Nanocrystalline AlCoCrCuFeNi high entropy alloy with 1 at. % Y was prepared by mechanical alloying and its microstructural stability was examined up to 1173 K (0.75 T_m). The lattice parameter analysis of the as-milled alloys shows a dual-phase structure, where Cu and Cr are identified as the host lattices for the FCC (0.362 nm) and BCC (0.288 nm) phases, respectively. The effect of Y addition on the microstructural evolution during annealing was studied by X-ray diffraction (XRD), and transmission electron microscopy (TEM). Molecular dynamics (MD) simulation was incorporated to track the atomistic behaviour of Y. Microhardness measurement was utilized to study the ability to retain strength after high temperature exposure. The FCC phase fraction is found to increase monotonically with increase in the annealing temperature. The Y addition helps in stabilizing an average grain size of ∼31 nm after annealing at 1173 K, along with retaining 82 % of the hardness (∼8.56 ± 0.3 GPa) observed for the ball-milled base alloy. The theoretical framework corroborated with the MD simulation elicited that the “thermodynamic” stabilization mechanism controls the superior coarsening resistance of the alloy. The strength predicted by the Hall-Petch analysis is in good agreement with the experimental result, further substantiating the stabilization of the nanocrystalline microstructure in the alloy annealed at 1173 K.

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掺杂 Y（钇）对纳米晶 AlCoCrCuFeNi 高熵合金热稳定性的影响

通过机械合金化方法制备了含 1 at.通过机械合金化方法制备了含 1% Y 的纳米晶铝铜铁镍高熵合金，并对其在 1173 K (0.75 Tm) 下的微观结构稳定性进行了检测。研磨合金的晶格参数分析表明其具有双相结构，其中铜和铬分别被确定为 FCC（0.362 nm）和 BCC（0.288 nm）相的主晶格。通过 X 射线衍射 (XRD) 和透射电子显微镜 (TEM) 研究了退火过程中添加 Y 对微观结构演变的影响。分子动力学（MD）模拟用于跟踪 Y 的原子行为。微硬度测量用于研究高温暴露后的强度保持能力。结果发现，随着退火温度的升高，FCC 相分数单调增加。在 1173 K 退火后，Y 的加入有助于稳定 31 nm 的平均晶粒大小，同时保留了球磨基础合金 82% 的硬度（8.56 ± 0.3 GPa）。理论框架与 MD 模拟证实，"热力学 "稳定机制控制着合金的优异抗粗化性能。霍尔-佩奇分析预测的强度与实验结果十分吻合，进一步证实了在 1173 K 下退火的合金中纳米晶微观结构的稳定性。

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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.