Microstructure Evolution and Strengthening Mechanism of AlCrFe2NiCuMox High Entropy Alloys

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2024-05-11 DOI:10.1007/s12540-024-01687-9

Junhui Zhao, Jinshuai Zhang, Xiaoyi Li, Xujie Gao, Nana Guo, Chengcheng Shi, Guangming Zhu, Jinhua Ding, Fengshi Yin

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Abstract

The AlCrFe₂NiCuMo_x multiphase high entropy alloys were designed, prepared and characterized. The effect of Mo addition on the microstructure evolution and mechanical properties of AlCrFe₂NiCuMo_x high entropy alloys was investigated. The microstructure of AlCrFe₂NiCuMo_x alloy consists of B2 + BCC + FCC + σ phases with a typical dendritic morphology. The addition of the Mo element promotes the generation of the σ phase in the alloy, while the B2 phase is gradually replaced by the σ phase. The hardness test and room temperature compression test results show that AlCrFe₂NiCuMo_0.6 alloy has a compressive rupture strength of 2030 MPa, a yield strength of 1462 MPa, a compressive strain limit of 18.18%, and a hardness of 488 HV, which has good comprehensive mechanical properties. With the increase of Mo element addition, the BCC solid solution phase and the ordered B2 phase separated in the alloy, and the σ phase precipitate from the BCC solid solution phase, and the mechanical properties of the alloy become worse at room temperature.

Graphic Abstract

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AlCrFe2NiCuMox 高熵合金的显微结构演变和强化机制

设计、制备并表征了 AlCrFe2NiCuMox 多相高熵合金。研究了添加 Mo 对 AlCrFe2NiCuMox 高熵合金微观结构演变和力学性能的影响。AlCrFe2NiCuMox 合金的微观结构由具有典型树枝状形态的 B2 + BCC + FCC + σ 相组成。钼元素的加入促进了合金中 σ 相的生成，而 B2 相则逐渐被 σ 相取代。硬度试验和室温压缩试验结果表明，AlCrFe2NiCuMo0.6合金的抗压断裂强度为2030 MPa，屈服强度为1462 MPa，抗压应变极限为18.18%，硬度为488 HV，具有良好的综合力学性能。随着Mo元素添加量的增加，合金中BCC固溶相与有序B2相分离，σ相从BCC固溶相中析出，室温下合金的力学性能变差。

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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.