Mechanical properties response of isotropic Ti2AlNb/TiAl interpenetrating phase composites with TPMS architectures prepared by laser powder bed fusion

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering Pub Date : 2025-04-22 DOI:10.1016/j.compositesb.2025.112559

Hang Zou , Rui Hu , Kewei Zhang , Zeyang Wu , Zitong Gao , Xinxin Liu , Chenglin Zhang , Xian Luo

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引用次数: 0

Abstract

TiAl alloys with high specific strength, excellent oxidation resistance and high-temperature performance are considered to replace nickel-based superalloys in the range of 700–800 °C. However, the low fracture toughness caused by the extremely high crack growth rate of TiAl alloys is still the biggest bottleneck restricting their development. Moreover, the anisotropy of continuous fibers and laminated structures reinforced composites is still present. In this study, a three-dimensional continuous Ti₂AlNb reinforcement scaffold suitable for the strengthening and toughening of the TiAl alloys was designed, which provides a new idea for isotropic Ti₂AlNb/TiAl interpenetrating phase composites (IPCs) with high strength and toughness. Furthermore, the forming quality of the scaffolds prepared by laser powder bed fusion (L-PBF) was studied, and the anisotropy of L-PBF printed scaffolds was evaluated through the homogenization method and finite element simulation (FEA). What's more, the IPCs were prepared by vacuum hot press sintering (HPS). And the deformation-failure behaviors of scaffolds and their IPCs were analyzed by experimental and FE-simulated quasi-static compression tests. The results show that the equivalent diameter and number of pores for the triply periodic minimal surface (TPMS) structures are small, mostly distributed in 30–60 μm with the volume fractions (VFs) of 0.14 %–0.26 %. The sheet-Gyroid (G_sh) and sheet-Split P (SP_sh) exhibit excellent isotropy, followed by the sheet-Diamond (D_sh), while the skeleton-Gyroid (G_sk) and sheet-Primitive (P_sh) show obvious anisotropy as the VF changes. The deviation between the maximum and minimum compressive strength values ranges from 1.7 % to 9.3 % for IPCs with a VF of 30 %, indicating that IPCs show good isotropy. The elastic modulus and yield strength of G_sh-IPCs are 15.8 % and 8.2 % higher than that of linear addition of TiAl matrix and G_sh scaffolds, respectively, which are contributed to three-dimensional interpenetrating structures composed of hard and soft phases, strong interfacial bonding as well as the specific TPMS structure.

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激光粉末床熔合制备TPMS结构各向同性Ti2AlNb/TiAl互穿相复合材料的力学性能响应

在700 ~ 800℃范围内，具有高比强度、优异的抗氧化性和高温性能的TiAl合金被认为是取代镍基高温合金的理想材料。然而，极高的裂纹扩展速率导致TiAl合金断裂韧性低仍然是制约其发展的最大瓶颈。此外，连续纤维和层合结构增强复合材料的各向异性仍然存在。本研究设计了一种适合TiAl合金强化增韧的三维连续Ti2AlNb增强支架，为高强度、高韧性各向同性Ti2AlNb/TiAl互渗相复合材料（IPCs）的研究提供了新思路。进一步研究了激光粉末床熔融（L-PBF）支架的成形质量，并通过均匀化方法和有限元模拟（FEA）对L-PBF打印支架的各向异性进行了评价。采用真空热压烧结（HPS）法制备了IPCs。通过实验和有限元模拟的准静态压缩试验，分析了支架的变形破坏行为及其IPCs。结果表明：三周期最小表面（TPMS）结构的等效孔径和孔隙数量较小，主要分布在30 ~ 60 μm之间，体积分数（VFs）为0.14% ~ 0.26%；随着VF的变化，片状gyroid （Gsh）和片状split P （SPsh）表现出优异的各向异性，其次是片状diamond (Dsh)，而skeleton-Gyroid （Gsk）和片状primitive （Psh）表现出明显的各向异性。当VF为30%时，最大抗压强度值与最小抗压强度值之间的偏差在1.7% ~ 9.3%之间，表明IPCs具有良好的各向同性。Gsh- ipcs的弹性模量和屈服强度分别比线性添加TiAl基体和Gsh支架高15.8%和8.2%，这是由于Gsh- ipcs具有软硬相组成的三维互穿结构、强的界面键合以及特定的TPMS结构。

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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.