Quenching of High Entropy Alloys after Annealing

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2020-12-10 DOI:10.22068/IJMSE.17.4.130

E. Abbasi, K. Dehghani, T. Niendorf, S. Sajadifar

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Abstract

The effect of cooling rate after annealing at 900 °C on the microstructure and hardness of high entropy alloys was investigated using two typical samples with the chemical composition of Co16Cr14.5Fe29Mn11.5Ni29 and Co11.5Cr7Fe27Mn27Ni27(Nb0.08C0.5) (at%). The microstructural characterisation and hardness measurements were carried out by optical microscopy, scanning electron microscopy, wavelength-dispersive X-ray spectroscopy, electron back scattered diffraction, X-ray diffraction technique and Vickers hardness testing. A face centred cubic crystal structure matrix was observed in both alloys before and after annealing and regardless of cooling conditions. SEM analyses revealed an extensive precipitation in Co11.5Cr7Fe27Mn27Ni27 (Nb0.08C0.5) alloy after annealing. It was also found that air/furnace cooling can enhance grain growth-coarsening just in Co16Cr14.5Fe29Mn11.5Ni29. However, the hardness results generally showed insignificant hardness variations in both alloys after water-quenching, air-cooling and furnace-cooling. The results suggested that the hardness is mainly controlled by solid solution strengthening.

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高熵合金退火后的淬火

采用化学成分为Co16Cr14.5Fe29Mn11.5Ni29和Co11.5Cr7Fe27Mn27Ni27(Nb0.08C0.5) (at%)的两种典型样品，研究了900℃退火后冷却速率对高熵合金显微组织和硬度的影响。采用光学显微镜、扫描电镜、波长色散x射线光谱学、电子背散射衍射、x射线衍射技术和维氏硬度测试对材料进行了显微组织表征和硬度测量。在退火前后，无论冷却条件如何，均观察到一个面心立方晶体结构基体。SEM分析表明，Co11.5Cr7Fe27Mn27Ni27 (Nb0.08C0.5)合金退火后有大量析出。空气/炉冷却只在Co16Cr14.5Fe29Mn11.5Ni29中促进晶粒生长-粗化。然而，两种合金在水淬、风冷和炉冷后的硬度结果总体上变化不大。结果表明，硬度主要由固溶强化控制。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.