铸态高熵双相合金的热稳定性和热膨胀行为

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-09-24 DOI:10.36547/ams.28.3.1551

K. Shmakova, V. Tsepelev, O. Chikova

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引用次数: 0

摘要

本文研究了等原子组成的双相AlFeCoNiCu铸态高熵合金的热稳定性和热膨胀性。FCC+BCC混合相为AlFeCoNiCu高熵合金。根据EDS分析的特征，与其他元素相比，Fe和Co几乎均匀地分布在两相中。BCC相富含Ni和Al，FCC相为Cu。我们对铸态AlFeCoNiCu合金的枝晶间（FCC相）和枝晶（BCC相）的硬度和弹性模量值的测量结果表明了两者之间的差异。枝晶间和枝晶的硬度分别为3.4±0.4GPa和4.1±0.6GPa。枝晶间的弹性模量分别为130.5±2.0GPa和166.5±5.6GPa。用膨胀法和差示扫描量热法研究了AlFeCoNiCu铸态高熵合金中相的热稳定性。DSC热谱图显示在1000K处有一个吸热峰。热膨胀系数（CTE）曲线显示，从室温到1370K，从（10.6±0.3）×10-6K−1到（27.7±0.3）。CTE温度曲线也显示了1000K时的峰值。CTE温度和DSC曲线中的峰值表明，随着温度升高至~1000K，发生了相变。

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THERMAL STABILITY AND THERMAL EXPANSION BEHAVIOR OF AlFeCoNiCu AS-CAST HIGH-ENTROPY DUAL-PHASE ALLOY

This work is devoted to the thermal stability and thermal expansion of dual-phase AlFeCoNiCu as-cast high-entropy alloy of equiatomic composition. The mix FCC + BCC phases is in AlFeCoNiCu high entropy alloy. According to characterized by EDS-analysis, Fe and Co are almost uniformly distributed in both phases in comparison with other elements. The BCC phase is rich in Ni and Al, and the FCC phase is Cu. Our measurement results of hardness and elastic modulus values for inter dendrites (FCC phase) and dendrites (BCC phase) of as-cast AlFeCoNiCu alloy showed the difference between there. Hardness values for inter dendrites and dendrites: 3.4±0.4GPa and 4.1±0.6GPa. Elastic modulus values for inter dendrites and dendrites: 130.5±2.0GPa and 166.5±5.6GPa. The thermal stability of the phases presented in AlFeCoNiCu as-cast high-entropy alloy has been studied with dilatometry and differential scanning calorimetry (DSC). The DSC thermogram shows an endothermic peak at 1000K. The coefficient of thermal expansion (CTE) curve shows linear increment from room temperature up to 1370K from (10.6 ± 0.3)×10-6K−1 to (27.7 ± 0.3) ×10-6K−1. The CTE temperature curve also shows the peak at 1000K. The peaks in the CTE temperature and the DSC curve suggest a phase transformation with increasing temperature up to~1000K.

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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.