Thermal stability and grain growth kinetics in rotary swaged Al0.35CoCrFeNi complex concentrated alloy

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2024-09-04 DOI:10.1016/j.intermet.2024.108456

Kateryna Ulybkina , Kateryna Kamyshnykova , Alena Klimová , Tatiana Pelachová , Andrea Školáková , Jan Pinc

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引用次数: 0

Abstract

A complex concentrated alloy (CCA) with a nominal composition of Al_0.35CoCrFeNi (mol.%) was prepared by vacuum induction melting and tilt casting. The microstructure of the alloy in the as-cast state consists of columnar dendritic grains. The ingots were solution annealed, rotary swaged, and heat treated to obtain a uniform fine-grain structure. To study the behavior of recrystallization and grain growth, heat treatment was carried out at temperatures from 1150 °C to 1300 °C and holding times up to 480 min. The resulting microstructures were analyzed by LM, SEM, TEM, EBSD, and XRD methods followed by a comparison with the results of hardness measurements. The alloy has a thermally stable single-phase face-centered cubic (FCC) structure in the studied temperature range. The grain growth kinetics were analyzed using classical models, and the activation energy was estimated to be ∼458 kJ mol⁻¹ using an Arrhenius-type equation. The greatest resistance to grain growth was observed at a temperature of 1150 °C. Hardness tests demonstrated an almost double increase in hardness after swaging and a sharp drop during the following heat treatment due to the onset of recrystallization. The Hall-Petch hardening coefficient was calculated to be ∼277.5 HV μm^−1/2.

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旋转压接 Al0.35CoCrFeNi 复合浓缩合金的热稳定性和晶粒生长动力学

通过真空感应熔炼和倾斜铸造制备了一种标称成分为 Al0.35CoCrFeNi (mol.%) 的复合浓缩合金 (CCA)。铸态合金的微观结构由柱状树枝状晶粒组成。铸锭经过固溶退火、旋转压接和热处理后，获得了均匀的细晶粒结构。为了研究再结晶和晶粒长大的行为，热处理温度为 1150 °C 至 1300 °C，保温时间长达 480 分钟。通过 LM、SEM、TEM、EBSD 和 XRD 方法对所得到的微观结构进行了分析，并与硬度测量结果进行了比较。在研究的温度范围内，合金具有热稳定的单相面心立方（FCC）结构。采用经典模型分析了晶粒生长动力学，并利用阿伦尼乌斯方程估算出活化能为 ∼458 kJ mol-1。在 1150 °C 的温度下，晶粒生长的阻力最大。硬度测试表明，锻造后硬度几乎增加了一倍，而在接下来的热处理过程中，由于再结晶的开始，硬度急剧下降。经计算，霍尔-佩奇硬化系数为 ∼277.5 HV μm-1/2。

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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.