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Microstructural evolution mediated creep deformation mechanism for the AlCoCrFeNi2.1 eutectic high-entropy alloy under different testing conditions
Materials Science and Engineering: A ( IF 6.4 ) Pub Date : 2022-09-29 , DOI: 10.1016/j.msea.2022.144100
Yafei Li, Weijian Chen, Chuanyang Lu, Huaxin Li, Wenjian Zheng, Yinghe Ma, Ying Jin, Weiya Jin, Zengliang Gao, Jianguo Yang, Yanming He

The AlCoCrFeNi2.1 high-entropy alloys (HEAs) with a unique eutectic microstructure of soft L12 and rigid B2 exhibit outstanding mechanical performance at both ambient and high temperatures. However, their high-temperature creep data are not available, which restricts their industrial application under extreme environments. For this, the current work investigated the effect of microstructural evolution on the creep behavior and deformation mechanism of the AlCoCrFeNi2.1. The creep tests were performed at 700–900 °C with a stress ranging from 0.2 to 0.6 times of the high-temperature yield strength. Detailed microstructural examination and theoretical analysis were conducted to explore the creep mechanism. The results showed that the precipitation behavior was responsible for the accelerated steady creep-strain rate and reduced creep life when performed at 800–900 °C, compared to 700 °C. The creep deformation mechanism and fracture behavior at 800–900 °C were also found to exhibit discrepancy with those at 700 °C, with the aid of calculating the stress exponents, activation energies, Larson-Miller and Orr-Sherby-Dorn parameters. Based on the creep data and microstructural examination conducted, the predominant creep deformation mechanism was uncovered for different testing conditions. The current work performed will be beneficial to understand the high-temperature deformation behavior of the AlCoCrFeNi2.1 EHEAs. The basic data acquired will also offer a guarantee for the application of EHEAs.



中文翻译:

不同试验条件下AlCoCrFeNi2.1共晶高熵合金的微观组织演化介导的蠕变变形机制

AlCoCrFeNi 2.1高熵合金 (HEA) 具有软 L1 2和刚性 B2 的独特共晶微观结构,在环境温度和高温下均表现出出色的机械性能。然而,它们的高温蠕变数据不可用,这限制了它们在极端环境下的工业应用。为此,目前的工作研究了微观结构演化对 AlCoCrFeNi 2.1蠕变行为和变形机制的影响。. 蠕变试验在 700–900 °C 下进行,应力范围为高温屈服强度的 0.2 至 0.6 倍。进行了详细的微观结构检查和理论分析,以探索蠕变机制。结果表明,与 700 °C 相比,在 800-900 °C 下进行时,沉淀行为是加速稳定蠕变应变速率和缩短蠕变寿命的原因。借助计算应力指数、活化能、Larson-Miller 和 Orr-Sherby-Dorn 参数,还发现 800-900°C 下的蠕变变形机制和断裂行为与 700°C 下的差异。基于蠕变数据和进行的微观结构检查,揭示了不同测试条件下的主要蠕变变形机制。2.1 EHE。获得的基础数据也将为EHEA的应用提供保障。

更新日期:2022-10-03
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