Additively manufactured TiAl-based composite with a multi-stage network structure synergically enabling strength and microstructural stability

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering Pub Date : 2025-04-04 DOI:10.1016/j.compositesb.2025.112460

Yi Song , Hui Xue , Xinhuan Tong , Luzheng Fu , Shun-Li Shang , Zi-Kui Liu , Yongfeng Liang , Junpin Lin

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引用次数: 0

Abstract

To meet the increasingly complex environmental demands, titanium aluminum (TiAl) alloys need to be improved in microstructural stability and high temperature strength. However, traditional TiAl alloys exhibit poor ductility, which are incompatible with conventional manufacturing techniques such as casting and forging. Aiming to overcome these limitations, this work presents a micro/nano multiphase synergistically reinforced TiAl-based composite with optimal addition of 0.10 at.% LaB₆ via directed energy deposition, showing a homogeneously equiaxed fully lamellar. Meanwhile, the ultimate tensile strength at room temperature is 997 MPa, which is 187 MPa higher than the pure TiAl alloy (810 MPa), even at 900 °C it remains at 685 MPa that is over 100 MPa higher than the pure TiAl alloy (560 MPa). Besides, the multi-stage network structure formed by TiB and La₂O₃ precipitates significantly improves the stability of the microstructure. The present work offers an alternative solution for designing enhanced TiAl-based composites with stable microstructures via additive manufacturing.

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增材制造的钛基复合材料具有多级网络结构，可协同增强强度和微观结构稳定性

为满足日益复杂的环境要求，钛铝（TiAl）合金需要提高显微组织稳定性和高温强度。然而，传统的TiAl合金具有较差的延展性，这与传统的制造技术如铸造和锻造不相容。为了克服这些限制，本研究提出了一种微/纳米多相协同增强钛基复合材料，最佳添加量为0.10 at。通过定向能沉积，得到了均匀等轴的全层状LaB6。同时，室温极限抗拉强度为997 MPa，比纯TiAl合金（810 MPa）高187 MPa，即使在900℃时也保持在685 MPa，比纯TiAl合金（560 MPa）高100 MPa以上。TiB和La2O3析出相形成的多级网状结构显著提高了组织的稳定性。目前的工作为通过增材制造设计具有稳定微结构的增强tial基复合材料提供了另一种解决方案。

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

Composites Part B: Engineering 工程技术-材料科学：复合

CiteScore

24.40

自引率

11.50%

发文量

784

审稿时长

21 days

期刊介绍： Composites Part B: Engineering is a journal that publishes impactful research of high quality on composite materials. This research is supported by fundamental mechanics and materials science and engineering approaches. The targeted research can cover a wide range of length scales, ranging from nano to micro and meso, and even to the full product and structure level. The journal specifically focuses on engineering applications that involve high performance composites. These applications can range from low volume and high cost to high volume and low cost composite development. The main goal of the journal is to provide a platform for the prompt publication of original and high quality research. The emphasis is on design, development, modeling, validation, and manufacturing of engineering details and concepts. The journal welcomes both basic research papers and proposals for review articles. Authors are encouraged to address challenges across various application areas. These areas include, but are not limited to, aerospace, automotive, and other surface transportation. The journal also covers energy-related applications, with a focus on renewable energy. Other application areas include infrastructure, off-shore and maritime projects, health care technology, and recreational products.