Influence of Fe micro-alloying and TiB2 reinforcement on the corrosion behavior of high Nb-containing TiAl alloys

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-04-19 DOI:10.1016/j.corsci.2025.112962

Feng Chen , Baofei Liu , Nan Wang , Yangyang Sun , Jie Ding , Hui Chang , Lian Zhou

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引用次数: 0

Abstract

To investigate the corrosion behavior of high Nb-containing TiAl alloys, samples of Ti-45Al-8Nb, Ti-45Al-8Nb-0.5 wt% Fe, and Ti-45Al-8Nb-0.5 wt% Fe-2wt% TiB₂ were fabricated via hot isostatic pressing (HIP). The effects of Fe micro-alloying and the combination of Fe micro-alloying with TiB₂ reinforcement on the corrosion properties of TiAl alloys were explored. The results revealed that the introduction of Fe caused significant lattice distortion in the γ-TiAl phase, while the presence of TiB₂ particles hindered the formation of a dense passive film on the sample surface. However, both Fe micro-alloying and TiB₂ reinforcement led to a notable reduction in the size of lamellar colony and the width of lamellar layers. The surface of TiAl and TiAl-Fe samples after corrosion was affected by the layered morphology formed by the difference in corrosion resistance between TiAl and Ti₃Al phases. The addition of Fe element reduced the number of corrosion pits, while TiAl-Fe-TiB₂ was subjected to micro-galvanic corrosion near TiB₂. The preferential corrosion area appeared, and there were flocculent and granular oxides. As a result, the corrosion current density of the sample decreased progressively from 1.42 × 10⁻⁷ A/cm² to 1.05 × 10⁻⁷ A/cm², and further to 9.86 × 10⁻⁸ A/cm². Additionally, the corrosion potential exhibited an anodic shift, increasing from −0.27 V to −0.11 V, and further to −0.09 V, indicating a significant enhancement in the corrosion resistance of the material. This combined effect of lattice distortion and grain refinement was found to impede the diffusion of Cl^- ions, significantly enhancing the formation rate of the passive film.

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Fe微合金化和TiB2增强对高含铌TiAl合金腐蚀行为的影响

为了研究高含 Nb TiAl 合金的腐蚀行为，通过热等静压（HIP）制造了 Ti-45Al-8Nb、Ti-45Al-8Nb-0.5 wt% Fe 和 Ti-45Al-8Nb-0.5 wt% Fe-2wt% TiB2 样品。探讨了铁微合金化以及铁微合金化与 TiB2 增强相结合对 TiAl 合金腐蚀性能的影响。结果表明，铁的引入会导致γ-TiAl 相发生明显的晶格畸变，而 TiB2 颗粒的存在则会阻碍在样品表面形成致密的被动膜。然而，铁微合金化和 TiB2 增强都导致片状菌落的尺寸和片状层的宽度明显减小。腐蚀后的 TiAl 和 TiAl-Fe 样品表面受到 TiAl 和 Ti3Al 相耐腐蚀性差异所形成的层状形态的影响。铁元素的加入减少了腐蚀坑的数量，而 TiAl-Fe-TiB2 则在 TiB2 附近受到微电化学腐蚀。出现了优先腐蚀区，并出现了絮状和颗粒状氧化物。因此，样品的腐蚀电流密度从 1.42 × 10-7 A/cm2逐渐下降到 1.05 × 10-7 A/cm2，并进一步下降到 9.86 × 10-8 A/cm2。此外，腐蚀电位也出现了阳极移动，从-0.27 V 上升到-0.11 V，再进一步上升到-0.09 V，这表明材料的耐腐蚀性显著增强。晶格畸变和晶粒细化的共同作用阻碍了 Cl- 离子的扩散，显著提高了被动膜的形成速度。

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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.