TiO2 nanofiber-derived in-situ Al2O3 particles reinforced TiAl matrix composites

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2024-09-02 DOI:10.1016/j.intermet.2024.108470

Hao Liu , Xiaolei Song , Huanghuang Wei , Ying Song , Yang Liu , Luping Long , Hua Chen , Zhenxin Duan , Ying Han , Xu Ran

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Abstract

In this study, Al₂O₃/TiAl composites were synthesized via powder metallurgy by incorporating TiO₂ nanoparticles and nanofibers as oxygen sources into Ti-45Al-8Nb pre-alloy powders, followed by vacuum hot-pressing sintering to form in-situ Al₂O₃ particles as reinforcements. The addition of TiO₂ nanofibers results in a better grain refinement effect and a more uniform distribution of Al₂O₃ particles within the composites. High-temperature tensile testing revealed that the composites prepared using TiO₂ nanofibers exhibited slightly higher strengths and significantly improved ductility compared to those synthesized with TiO₂ nanoparticles. This work not only introduces a novel additive for fabricating high-performance in-situ Al₂O₃/TiAl composites but also demonstrates a unique application of TiO₂ nanofibers.

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纳米 TiO2 纤维衍生的原位 Al2O3 粒子增强 TiAl 基复合材料

本研究通过粉末冶金法合成了 Al2O3/TiAl 复合材料，在 Ti-45Al-8Nb 预合金粉末中加入 TiO2 纳米颗粒和纳米纤维作为氧源，然后通过真空热压烧结形成原位 Al2O3 颗粒作为增强体。加入 TiO2 纳米纤维后，复合材料的晶粒细化效果更好，Al2O3 颗粒的分布也更均匀。高温拉伸测试表明，与使用 TiO2 纳米粒子合成的复合材料相比，使用 TiO2 纳米纤维制备的复合材料强度略高，延展性明显改善。这项工作不仅为制造高性能原位 Al2O3/TiAl 复合材料引入了一种新型添加剂，还展示了 TiO2 纳米纤维的独特应用。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.