A significant improvement in corrosion resistance and mechanical properties of Cu-containing nanocrystalline Ti-Mo-Nb-Ta refractory complex concentrated alloy

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Corrosion Science Pub Date : 2025-01-26 DOI:10.1016/j.corsci.2025.112737

Solomon-Oshioke Agbedor , Ding Gao , Kaiyang Li , Qian Lei , Aqsa Kanwal , Igbafen Emmanuel Ohiomomo , Shaohua Xing , Jian Hou , Mingxian Sun , Hong Wu

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Abstract

Experimental and computational methods were combined to explore the effects of Cu content on the microstructure, mechanical, and corrosion properties of powder metallurgy (P/M) Ti-Mo-Nb-Ta refractory CCAs. Cu addition refines the grains and significantly improves the strength and work hardening rate. The Cu-free alloy suffered pitting corrosion in Mo-rich regions. Cu addition redistributes Mo and reduces matrix susceptibility to pitting. An electro-dissolution mechanism is proposed and the effect of the alloying elements upon the impedance response is explained. The TMNT-C1.0 specimen exhibited the best corrosion resistance of 26.0 × 10³ Ω•cm² and the least corrosion rate of 0.00396 mm/a compared to the Cu-free specimen. New solid solution oxide complexes were discovered, which act as a protective layer on the Cu-containing specimens. DFT calculation reveals that the mixed oxide complex film is more resistant to Clˉ adsorption, potentially inhibiting corrosion more effectively than the stable Mo₂O₅/Cl or MoO₃/Cl at the pit sites.

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.