In this paper, W-TiC-ZrC composites with extremely high strength were prepared by high-energy ball milling followed by spark plasma sintering. The microstructure morphology and structural evolution of the composites were thoroughly analyzed by SEM, EDS, EBSD, XRD, XPS and TEM, and the mechanical properties of the composites were accurately evaluated by microhardness tests and compression tests at room temperature and high temperatures. The results show that the micromorphology of W-TiC-ZrC composites changes from a spherical shape to an elongated shape with the increase of TiC-ZrC addition. Meanwhile, the grain size decreased from 1.32 μm to 0.32 μm with the increase of the reinforcing phase content, however, the strength has a significant enhancement, and the microhardness and compressive strength of the W-3%TiC-3%ZrC composites are 952.0 HV and 2754.6 MPa, respectively. In addition, the W-3%TiC-3%ZrC composites were also shown to exhibit sufficient thermal stability, with compressive strengths of 2716.2 MPa, 2560.8 MPa, and 2323.8 MPa at 200 °C, 400 °C, and 600 °C, respectively. The extremely high strength of W-matrix composites is due to the formation of various second phases in the composites. The appearance of the second phases plays a role in fine grain strengthening, dispersion strengthening, solid solution strengthening, and thermal mismatch strengthening.

中文翻译：

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放电等离子烧结TiC-ZrC颗粒协同增强钨基复合材料的显微组织与力学性能


本文通过高能球磨和放电等离子烧结制备了具有极高强度的W-TiC-ZrC复合材料。通过SEM、EDS、EBSD、XRD、XPS和TEM对复合材料的微观形貌和结构演化进行了深入分析，并通过显微硬度测试和室温和高温压缩测试准确评价了复合材料的力学性能。结果表明，随着TiC-ZrC添加量的增加，W-TiC-ZrC复合材料的微观形貌由球形变为细长形。同时，随着强化相含量的增加，晶粒尺寸从1.32 μm减小到0.32 μm，但强度却有显着提高，W-3%TiC-3%ZrC复合材料的显微硬度和抗压强度为952.0分别为 HV 和 2754.6 MPa。此外，W-3%TiC-3%ZrC复合材料还表现出足够的热稳定性，在200℃、400℃和600℃下的压缩强度分别为2716.2 MPa、2560.8 MPa和2323.8 MPa，分别。 W基复合材料的极高强度是由于复合材料中各种第二相的形成。第二相的出现起到细晶强化、弥散强化、固溶强化和热失配强化的作用。