Al content regulation of microstructure, wear resistance, and corrosion behavior in Mo0.5NbTiZrAlx high-entropy alloys

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-02-06 DOI:10.1016/j.jallcom.2025.179037

Qi Gao, Siyang Guo, Zhijun Hu, Qingfeng Guan, Jintong Guan, Shun Guo, HaiXia Liu, Guanglei Liu, Xinlin Liu, Qingsong Zhang, Peng Lyu

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Abstract

This study is aimed at investigating the Mo_0.5NbTiZrAl_x (x = 0.3, 0.5, 0.7) high-entropy alloys (HEAs) produced via arc melting. The microstructure, microhardness, wear resistance, and corrosion resistance of alloys were studied systematically. The results revealed that Mo_0.5NbTiZrAl_0.3 and Mo_0.5NbTiZrAl_0.5 compositions had a single BCC phase structure, while the Mo_0.5NbTiZrAl_0.7 composition exhibited a BCC+B2 phase structure. Meanwhile, the alloys exhibited the typical dendritic morphology. The increase of Al content promoted grain refinement and crystal orientation randomization. It also enriched the defect structure within the alloys and induced the occurrence of spinodal decomposition phenomenon. Moreover, the increase in Al content significantly improved the hardness and wear resistance of alloys, which was attributed to synergistic effects of tough BCC phase, solid solution strengthening, B2 phase strengthening, fine grain strengthening, and dislocation strengthening. In addition, the electrochemical tests confirmed that the increase of Al content inhibited the improvement of corrosion resistance due to the growth of Al₂O₃ films aggravated the erosion by Cl^-.

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.