Mechanical alloying synthesis and spark plasma sintering consolidation of CoCrFeNiAl high-entropy alloy

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• 作者：Wei Ji ; Zhengyi Fu ; Weimin Wang ; Hao Wang ; Jinyong Zhang ; Yucheng Wang ; Fan Zhang
• 关键词：Entropy ; Mechanical alloying ; Sintering ; Microstructure ; Phase transitions ; Mechanical properties
• 刊名：Journal of Alloys and Compounds
• 出版年：15 March, 2014
• 年：2014
• 卷：589
• 期：Complete
• 页码：61-66
• 全文大小：1887 K

文摘

An equiatomic CoCrFeNiAl high-entropy alloy was synthesized by mechanical alloying, and phase evolutions, microstructure, thermal properties and annealing behaviors were investigated. It was found that a body-centered cubic structured solid solution with refined microstructure of 20 nm in grain size could be obtained after 30 h milling. As-milled powder exhibited good phase stability until 500 掳C, and transformed into a face-centered cubic phase above 500 掳C. The as-milled powder was subsequently consolidated by spark plasma sintering at 900 掳C. BCC phase and FCC phase coexisted in the consolidated HEA, which had excellent properties in Vickers hardness of 625 HV and compressive strength of 1907 MPa.