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

IF 6.3 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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Al含量对Mo0.5NbTiZrAlx高熵合金组织、耐磨性和腐蚀行为的调节

研究了电弧熔炼法制备Mo0.5NbTiZrAlx （x = 0.3, 0.5, 0.7）高熵合金（HEAs）。系统地研究了合金的显微组织、显微硬度、耐磨性和耐蚀性。结果表明，Mo0.5NbTiZrAl0.3和Mo0.5NbTiZrAl0.5组分具有单一的BCC相结构，而Mo0.5NbTiZrAl0.7组分具有BCC+B2相结构。同时，合金表现出典型的枝晶形貌。Al含量的增加促进了晶粒细化和取向的随机化。同时也丰富了合金内部的缺陷组织，诱发了旋量分解现象的发生。Al含量的增加显著提高了合金的硬度和耐磨性，这是韧性BCC相、固溶体强化、B2相强化、细晶粒强化和位错强化的协同作用。此外，电化学测试证实，Al含量的增加抑制了耐蚀性能的提高，因为Al2O3薄膜的生长加剧了Cl-的侵蚀。

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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.