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Mechanical properties of Fe-Al-Ta eutectic composites at higher solidification rates

机译：Fe-Al-Ta共晶复合材料在较高凝固率下的机械性能

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摘要

As is known, solidification rate has an obvious effect on microstructure and property. Mechanical properties of Fe-Al-Ta eutectic composites at the solidification rates of 650 μm/s, 700 μm/s, 800 μm/s and 900 μm/s were studied in the present paper. Microhardness, tensile property and fracture toughness of Fe-Al-Ta eutectic composites at different solidification rates were studied respectively. Microhardness value of directionally solidified Fe-Al-Ta eutectic composites is significantly increased as compared with that of the as-cast alloy, and the relationship between microhardness and lamellar/rod spacing satisfies Hall-Petch Formula. There is no obvious plastic deformation characteristic during the process of tensile loading and the eutectic structure fracture is brittle fracture. In addition, the three-point bending fracture toughness is firstly increased then decreased with the increase of the solidification rate. When the solidification rate gets to 700 μm/s, the fracture model of Fe-Al-Ta eutectic composites is a cleavage-dimple mixed fracture, and the fracture toughness reaches the maximum value. The toughening mechanism can be ascribed to fine grain strengthening, crack deflection and interface enhancement.
机译：众所周知，凝固率对微观结构和性能具有明显的影响。在本文中研究了在650μm/ s，700μm/ s，800μm/ s和900μm/ s的凝固率下的Fe-Al-Ta共晶复合材料的机械性能。研究了不同凝固率的Fe-Al-Ta共晶复合材料的显微硬度，拉伸性和断裂韧性。与铸造合金的相比，定向固化的Fe-Al-Ta共晶复合材料的微硬度值显着增加，并且微硬度和层状/杆间距之间的关系满足了霍尔 - PACH公式。拉伸载荷过程中没有明显的塑性变形特性，共晶结构骨折是脆性骨折。另外，三点弯曲断裂韧性首先增加随着凝固率的增加而降低。当凝固率为700μm/ s时，Fe-Al-Ta共晶复合材料的断裂模型是裂解 - 凹坑混合骨折，并且断裂韧性达到最大值。增韧机构可以归因于细粒强化，裂缝偏转和界面增强。

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  • 来源
    《Materials Science and Engineering》 |2021年第8期|141765.1-141765.11|共11页
  • 作者

    Chunjuan Cui; Yan Wang; Kai Zhang; Chongyang Wu; Wei Liu; Li Deng; Cong Wang; Haijun Su;

  • 作者单位

    School of Metallurgical Engineering Xian University of Architecture and Technology Xian 710055 China;

    School of Metallurgical Engineering Xian University of Architecture and Technology Xian 710055 China;

    School of Metallurgical Engineering Xian University of Architecture and Technology Xian 710055 China;

    School of Metallurgical Engineering Xian University of Architecture and Technology Xian 710055 China;

    School of Metallurgical Engineering Xian University of Architecture and Technology Xian 710055 China;

    School of Metallurgical Engineering Xian University of Architecture and Technology Xian 710055 China;

    School of Metallurgical Engineering Xian University of Architecture and Technology Xian 710055 China;

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi an 710072 PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Directional solidification; Fe-Al-Ta eutectic composites; Microhardness; Tensile; Three-point bending fracture;

    机译：定向凝固;Fe-Al-Ta共晶复合材料;微硬度;拉伸;三点弯曲骨折;

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