Nacre-inspired design: Synergistic enhancement of diffusion control and fracture toughness in gradient TBCs on TiAl Alloy

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

Corrosion Science Pub Date : 2025-07-03 DOI:10.1016/j.corsci.2025.113156

Chen Hua , Taihong Huang , Yantong Man , Rongfeng Zhou , Ruixiong Zhai , Chenghui Su , Yali Yang , Xuan He , Peng Song

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引用次数: 0

Abstract

A bioinspired CoNiCrAlY-Y₂O₃-Cr₃C₂/8YSZ nacre-like gradient coating was successfully fabricated on a Ti-43.5Al-4Nb-1Mo-0.1B alloy substrate using atmospheric plasma spraying (APS). The gradient structure was achieved by regulating the dual-tube powder injection, enabling tailored composition and microstructure across the thickness. Upon cyclic oxidation at 900 °C, a dense interfacial diffusion barrier composed of in-situ formed Ti₂CN and Ti₂AlN phases effectively suppressed the inward diffusion of Co and Ni, thereby enhancing interfacial stability. Microstructural characterization and thermodynamic analysis revealed that Ti₂CN formed preferentially at early oxidation stages, followed by the growth of Ti₂AlN, jointly establishing a multilayered barrier. Mechanical evaluation, including microhardness and indentation analysis, demonstrated improved hardness compatibility and crack resistance across the interface. This study provides new insights into the design of functionally graded thermal barrier coatings (TBCs) for advanced TiAl-based components, emphasizing the synergistic optimization of diffusion control and mechanical reliability.

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以珠核为灵感的设计：协同增强TiAl合金梯度tcs的扩散控制和断裂韧性

采用大气等离子喷涂技术（APS）在Ti-43.5Al-4Nb-1Mo-0.1B合金基体上成功制备了仿生CoNiCrAlY-Y2O3-Cr3C2/8YSZ纳米状梯度涂层。梯度结构是通过调节双管粉末注入来实现的，从而实现了跨厚度的定制成分和微观结构。900℃循环氧化后，由原位形成的Ti2CN和Ti2AlN相组成的致密界面扩散屏障有效地抑制了Co和Ni的向内扩散，从而增强了界面的稳定性。微观结构表征和热力学分析表明，Ti2CN优先在氧化早期形成，其次是Ti2AlN的生长，共同形成多层势垒。力学评估，包括显微硬度和压痕分析，证明了硬度相容性和抗裂性在界面上的改善。该研究为高级钛基部件的功能梯度热障涂层（tbc）的设计提供了新的见解，强调了扩散控制和机械可靠性的协同优化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.