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 : 2025-04-15 Epub 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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含cu纳米晶Ti-Mo-Nb-Ta难熔复合浓缩合金的耐蚀性和力学性能均有显著改善

采用实验和计算相结合的方法，研究了Cu含量对粉末冶金（P/M） Ti-Mo-Nb-Ta耐火CCAs显微组织、力学性能和腐蚀性能的影响。Cu的加入细化了晶粒，显著提高了强度和加工硬化率。无cu合金在富mo区域发生点蚀。Cu的加入重新分配了Mo，降低了基体对点蚀的敏感性。提出了电溶机理，并解释了合金元素对阻抗响应的影响。与不含cu的试样相比，TMNT-C1.0试样的耐蚀性最佳，为26.0 × 103 Ω•cm2，腐蚀速率最小，为0.00396 mm/a。发现了新的固溶体氧化物配合物，在含cu样品上起到保护层的作用。DFT计算表明，混合氧化物络合膜比稳定的Mo2O5/Cl或MoO3/Cl更能抵抗Cl - 2的吸附，在坑位处可能更有效地抑制腐蚀。

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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.