Formation mechanism and property of interface microstructure between surface (TiNb)C-reinforced layer and TiNb substrate

IF 3.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Vacuum Pub Date : 2024-09-07 DOI:10.1016/j.vacuum.2024.113622

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Abstract

The interface microstructure between the surface (TiNb)C-reinforced layer and TiNb substrate was fabricated through an in situ diffusion reaction in a vacuum environment. Microstructure, element composition, and phase distribution were investigated to elucidate the reaction process and formation mechanism of the transition phase at the interface. Indentation and fracture analysis were performed to assess the interface properties. The results indicated that there is a clearly banded microstructure existed between the surface-reinforced layer and TiNb substrate and that the phase in the transition region had an orthorhombic structure. The analyses revealed that the transition region formed at the front of the reaction interface, in which the main phase was (TiNb)₂C. The structure of (TiNb)₂C could be approximated as that of α-Nb₂C, and (TiNb)₂C reacted to form (TiNb)C with the further diffusion of C. Indentation analysis indicate that the apparent fracture toughness of the interface at different loads was 2.57–3.44 MPa m^1/2, higher than that of the surface-reinforced layer. The bending experiment further proved that the microstructure in the transition region was brittle but showed good resistance to interface crack propagation.

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表面（TiNb）C 增强层与 TiNb 基底之间界面微结构的形成机理与特性

通过在真空环境中进行原位扩散反应，制备了表面 (TiNb)C 增强层和 TiNb 基底之间的界面微结构。对微观结构、元素组成和相分布进行了研究，以阐明界面过渡相的反应过程和形成机制。为评估界面特性，还进行了压痕和断裂分析。结果表明，在表面强化层和钛铌基底之间存在明显的带状微观结构，过渡区的相具有正方体结构。分析表明，过渡区形成于反应界面的前端，其中的主相为 (TiNb)2C。压痕分析表明，界面在不同载荷下的表观断裂韧性为 2.57-3.44 MPa m1/2，高于表面增强层。弯曲实验进一步证明，过渡区域的微观结构是脆性的，但对界面裂纹扩展表现出良好的抵抗力。

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来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.