Effects of Ti Content on the Microstructure and Mechanical Properties of Al0.2CoCrFeNi2Tix High-Entropy Alloys

IF 4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Metals and Materials International Pub Date : 2024-09-26 DOI:10.1007/s12540-024-01803-9

Fan Yang, Wenqing Fu, Menglu Jian, Qiannan Hu, Min Liu, Guangshi Li, Zhanyong Wang, Fangjie Li, Qin Shen

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Abstract

Two high entropy alloys (HEAs) with composition of Al_0.2CoCrFeNi₂Ti_x (x = 0.2, 0.4) were prepared through cold rolling and heat treatment to attained favorable mechanical properties and their microstructures were characterized to illustrate the strengthening mechanisms. The results found that the Ti0.4 alloy had high strength (1.34 GPa) via fine grain boundary strengthening and dislocation strengthening, while the existed larger and rod-shaped L1₂ phase caused its limited ductility (10.3%). The Ti0.2 alloy has high strength and plasticity and was superior to the conventional alloys, which was mainly attributed to the nano-sized L1₂ precipitation. The new HEAs are the potential materials to satisfy the needs of contemporary engineering applications and provides reference ideas for designing multi-element metal materials for future applications.

Graphical Abstract

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Ti含量对Al0.2CoCrFeNi2Tix高熵合金组织和力学性能的影响

通过冷轧和热处理制备了Al0.2CoCrFeNi2Tix （x = 0.2, 0.4）组成的高熵合金（HEAs），获得了良好的力学性能，并对其组织进行了表征以阐明强化机理。结果表明：通过细晶界强化和位错强化，Ti0.4合金具有较高的强度（1.34 GPa），但存在较大的棒状L12相导致其塑性有限（10.3%）。Ti0.2合金具有较高的强度和塑性，优于常规合金，这主要归功于纳米级L12的析出。新型HEAs材料是满足当代工程应用需求的潜在材料，为未来多元素金属材料的设计提供了参考思路。图形抽象

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.