The effect of Y2O3 particles on the microstructure and mechanical properties of tungsten fiber-reinforced tungsten composites

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Science and Engineering: A Pub Date : 2024-10-22 DOI:10.1016/j.msea.2024.147449

Y. Chen , C. Chen , J.H. Chen , K.L. Li , S. Wang , Y.F. Zhang , H.Y. Chen , T.H. Beri , J. Wang , L.M. Luo , Y.C. Wu

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Abstract

Tungsten fiber-reinforced tungsten (W_f/W) composites are a promising plasma-facing material, and the microstructure at the interface between W fibers and the W matrix greatly impacts performance. In this study, a new kind of W_f/W-Y₂O₃ composites was developed with the addition of Y₂O₃ particles to the W matrix in order to modify the interface microstructure between W fibers and the matrix. The microstructure and mechanical properties of these composites were investigated through sintering at temperatures ranging from 1500 °C to 1800 °C. The Y₂O₃ particles with a face-centered cubic crystal structure were formed at the interface between W fibers and the matrix, which is beneficial for weakening the bonding strength. The W_f/W-Y₂O₃ composites exhibited pseudo-plasticity at low sintering temperatures, which show the highest bending strength (261 MPa) and fracture energy (6.66 kJ/m²) at 1600 °C. The grains in W particles become the recrystallized nuclei on the surface of W fiber through the bonding of W powder and W fibers. Then, these recrystallized nuclei grow into W fibers by migration of bonding boundaries. However, the Y₂O₃ particles in the W powder can inhibit the migration of grain boundaries, thereby suppressing the abnormal grain growth behavior at the surface of W fiber.

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Y2O3 粒子对钨纤维增强钨复合材料微观结构和力学性能的影响

钨纤维增强钨（Wf/W）复合材料是一种前景广阔的等离子体面层材料，而钨纤维与钨基体之间界面的微观结构对性能有很大影响。本研究开发了一种新型 Wf/W-Y2O3 复合材料，在 W 基体中加入 Y2O3 颗粒，以改变 W 纤维与基体之间的界面微结构。通过在 1500 °C 至 1800 °C 温度范围内进行烧结，研究了这些复合材料的微观结构和机械性能。在 W 纤维和基体之间的界面上形成了具有面心立方晶体结构的 Y2O3 颗粒，这有利于削弱结合强度。Wf/W-Y2O3 复合材料在低烧结温度下表现出假塑性，在 1600 °C 时弯曲强度（261 MPa）和断裂能（6.66 kJ/m2）最高。W 颗粒中的晶粒通过 W 粉末和 W 纤维的结合成为 W 纤维表面的再结晶核。然后，这些再结晶核通过键合边界的迁移长成 W 纤维。然而，W 粉末中的 Y2O3 颗粒可以抑制晶界迁移，从而抑制 W 纤维表面的异常晶粒生长行为。

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.