Phase stability and tensile properties of Co-free Al_0.5CrCuFeNi₂ high-entropy alloys

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• 作者：Chun Ng ; Sheng Guo ; Junhua Luan ; Qing Wang ; Jian Lu ; Sanqiang Shi ; C.T. Liu
• 关键词：High entropy alloys ; Thermomechanical treatments ; Phase stability ; Thermodynamics calculations ; Tensile tests ; Indentation behavior
• 刊名：Journal of Alloys and Compounds
• 出版年：25 January, 2014
• 年：2014
• 卷：584
• 期：Complete
• 页码：530-537
• 全文大小：2602 K

文摘

High-entropy alloys (HEAs) are becoming new research frontiers in the metallic materials field. The phase stability of HEAs is of critical significance, but a convincing understanding on it has been somewhat held back by the slow diffusion kinetics, which prevents the completion of diffusion assisted phase transformations toward the equilibrium state. Here a unique methodology, combining both the thermomechanical treatments and thermodynamic calculations, was employed to reveal the phase stability of HEAs, exemplified using the newly developed Al_0.5CrCuFeNi₂ alloy. The metastable nature of the solid solution phases in this high-entropy alloy was uncovered through thermomechanical treatments induced phase transformations, and supported by the thermodynamic calculations. Meanwhile, the tensile properties for both the as-cast and thermomechanically treated alloys were measured, and correlated to their indentation behavior.