粉末冶金法制造的连续纤维增强 Wf/Y2O3/W 复合材料的断裂行为和增韧机理研究

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering Pub Date : 2024-09-21 DOI:10.1016/j.compositesb.2024.111845

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引用次数: 0

摘要

钨（W）是核聚变反应堆等离子体面组件的理想候选材料。然而，钨存在内在脆性问题。钨纤维增强钨复合材料（Wf/W）是基于外在增韧机制的概念开发的，在断裂过程中表现出假韧性。本研究通过粉末冶金（PM）工艺制备了连续纤维增强 Wf/Y2O3/W 复合材料，并对其微观结构和力学性能进行了表征。结合实验和数值模拟结果，详细分析了断裂行为和增韧机理。Wf/Y2O3/W 复合材料的增韧有多种机制，如纤维架桥、裂纹弯曲和变形、界面脱粘和纤维塑性变形。界面脱粘的能量耗散可以忽略不计。然而，这是确保任何外在增韧机制的必要因素。在复合材料失效时，能量耗散的主要贡献是纤维的塑性变形。

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Study on the fracture behavior and toughening mechanisms of continuous fiber reinforced Wf/Y2O3/W composites fabricated via powder metallurgy

Tungsten (W) is a promising candidate material for the plasma facing components in fusion reactors. However, it has issues regarding the intrinsic brittleness. Tungsten fiber reinforced tungsten composites (W_f/W) have been developed based on the concept of extrinsic toughening mechanisms and they show a pseudo-ductile behavior during the fracture process. In the present work, continuous fiber reinforced W_f/Y₂O₃/W composites were fabricated via a powder metallurgy (PM) process, and the microstructure and mechanical properties were characterized. The fracture behavior and toughening mechanisms were analyzed in detail combining the results of experiments and numerical simulation. The W_f/Y₂O₃/W composites is toughened by multiple mechanisms such as fiber bridging, crack bending and deflection, interface de-bonding and plastic deformation of fiber. The energy dissipation by interface de-bonding can be neglected. However, it is a necessary factor to ensure any extrinsic toughening mechanisms. The main contribution of the energy dissipation while composite failure is the plastic deformation of fibers.

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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.