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Tracer diffusion in single crystalline CoCrFeNi and CoCrFeMnNi high-entropy alloys: Kinetic hints towards a low-temperature phase instability of the solid-solution?
Scripta Materialia ( IF 6 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.scriptamat.2020.05.060
Daniel Gaertner , Josua Kottke , Yury Chumlyakov , Fabian Hergemöller , Gerhard Wilde , Sergiy V. Divinski

Abstract Tracer-diffusion of constituting elements in single-crystalline CoCrFeNi and CoCrFeMnNi is measured from 923 K to 1373 K. In CoCrFeMnNi, low-temperature deviations from otherwise linear Arrhenius-type dependencies are seen for all elements excluding Mn. The kinks are prominent at about 1100 K for Co and Ni and at 900 K for Cr and Fe indicating the existence of a low-temperature modification of the equiatomic solid-solution phase in CoCrFeMnNi. The temperature-dependent correlation factors of all elements are determined within the framework of the random alloy model providing insights into potential mechanisms of the kinetic anomaly.

中文翻译:

单晶 CoCrFeNi 和 CoCrFeMnNi 高熵合金中的示踪剂扩散:动力学暗示固溶体的低温相不稳定性?

摘要 单晶 CoCrFeNi 和 CoCrFeMnNi 中构成元素的示踪扩散在 923 K 到 1373 K 之间进行测量。在 CoCrFeMnNi 中,除了 Mn 之外的所有元素都可以看到与其他线性阿伦尼乌斯型相关性的低温偏差。Co 和 Ni 的扭结在约 1100 K 和 Cr 和 Fe 的 900 K 处显着,表明 CoCrFeMnNi 中等原子固溶体相存在低温改性。所有元素的温度相关相关因子在随机合金模型的框架内确定,提供对动力学异常潜在机制的深入了解。
更新日期:2020-10-01
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