Direct solidification of bulk ultrafine-microstructure eutectic high-entropy alloys with outstanding thermal stability. (May 2019)

• Record Type: Journal Article
• Authors: Jiang, Hui; Qiao, Dongxu; Lu, Yiping; Ren, Zheng; Cao, Zhiqiang; Wang, Tongmin; Li, Tingju
• Is Part Of: Scripta materialia. Number 165(2019)
• Page Start: 145
• Page End: 149
• Publication Date: 2019-05
• Subjects: High entropy alloys -- Nanostructure -- Eutectic -- Mechanical properties; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.02.035
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Although nanostructured (NS) and ultrafine-microstructure (UFM) materials possess excellent mechanical properties, how to manufacture bulk NS and UFM materials with minimum cost via direct casting remains challenging. Here, we report an efficient strategy to prepare bulk UFM alloys via the direct solidification method for eutectic high-entropy alloy (EHEA). As a proof of concept, we designed CoCrFeNiNb0.45 EHEA and achieved complete bulk UFM ingot with weight of 2.5 kg, demonstrating an ultrafine-lamellar microstructure. The as-cast alloy shows outstanding thermal stability and hardness up to 1100 °C. Graphical abstract: Unlabelled Image