Microstructure evolution and hydrogen absorption characteristics of gradient-hydrogenated Ti-4.5Al-3V-2Mo-2Fe alloys

IF 7.9 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials & Design Pub Date : 2024-11-01 DOI:10.1016/j.matdes.2024.113436

Jinyuan Zhang , Shaosong Jiang , Yong Jia , Peng Peng , Yang Li , Shang Yang , Zhen Lu

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Abstract

Ti-4.5Al-3V-2Mo-2Fe rolled material is a dual-phase titanium alloy with an average grain size of less than 3 μm; its optimal superplastic forming temperature of 760 °C is at least 50 °C lower than the temperature required for diffusion bonding, making it challenging to carry out superplastic forming/diffusion bonding within a process window. The promotion of hydrogen on the low-temperature diffusion bonding of the alloy was verified through thermohydrogen processing, and the absorption characteristics of hydrogen in the alloy at various temperatures, holding times, and pressures were investigated. Subsequently, a mathematical model for achieving standardized hydrogen content was developed. X-ray polycrystalline diffractometer (XRD) analysis was utilized to preliminarily explore phase differences in samples with varying levels of hydrogen content. Furthermore, scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron back scatter diffraction (EBSD) and time of flight secondary ion mass spectrometry (TOF-SIMS) were employed to analyze microstructure changes and hydrogen distribution in both the surface and core regions of the titanium alloy following hydrogenation, demonstrating its feasibility for surface hydrogenation treatment of titanium alloy sheets.

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梯度氢化 Ti-4.5Al-3V-2Mo-2Fe 合金的微观结构演变和吸氢特性

Ti-4.5Al-3V-2Mo-2Fe 轧制材料是一种平均晶粒尺寸小于 3 μm 的双相钛合金；其最佳超塑性成形温度为 760 °C，比扩散结合所需的温度至少低 50 °C，因此在工艺窗口内进行超塑性成形/扩散结合具有挑战性。通过热氢加工验证了氢对合金低温扩散结合的促进作用，并研究了合金在不同温度、保温时间和压力下的吸氢特性。随后，建立了实现标准化氢含量的数学模型。利用 X 射线多晶衍射仪 (XRD) 分析初步探讨了不同氢含量样品的相位差。此外，还利用扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、电子背散射衍射 (EBSD) 和飞行时间二次离子质谱 (TOF-SIMS) 分析了氢化后钛合金表面和核心区域的微观结构变化和氢分布，证明了其用于钛合金板材表面氢化处理的可行性。

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来源期刊

Materials & Design Engineering-Mechanical Engineering

CiteScore

14.30

自引率

7.10%

发文量

1028

审稿时长

85 days

期刊介绍： Materials and Design is a multi-disciplinary journal that publishes original research reports, review articles, and express communications. The journal focuses on studying the structure and properties of inorganic and organic materials, advancements in synthesis, processing, characterization, and testing, the design of materials and engineering systems, and their applications in technology. It aims to bring together various aspects of materials science, engineering, physics, and chemistry. The journal explores themes ranging from materials to design and aims to reveal the connections between natural and artificial materials, as well as experiment and modeling. Manuscripts submitted to Materials and Design should contain elements of discovery and surprise, as they often contribute new insights into the architecture and function of matter.