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Effect of Si additions on microstructure and mechanical properties of refractory NbTaWMo high-entropy alloys

机译：Si添加对难治性NBTAWMO高熵合金微观结构和力学性能的影响

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摘要

To improve the high-temperature strength and decrease the density of NbTaWMo alloys, addition of light element Si producing the second-phase silicide is employed. Refractory NbTaWMoSix (x=0, 0.25, 0.5, 0.75) high-entropy alloys are produced by spark plasma sintering. The phase evolution, microstructure, compressive mechanical properties, and high-temperature hardness are investigated in this study. It reveals that there is only a disordered body-centered cubic (BCC) phase in the matrix NbTaWMo alloy. After adding the Si element, NbTaWMoSix alloys demonstrate the presence of multiphase structure: disordered BCC phase and silicide phase. As the content of Si is increased, the proportion of silicide is increased, which improves the hardness and strength. The addition of Si at certain concentration (x=0.25 and 0.5) has positive effect on ductility of the alloys. The alloys all demonstrate brittle fracture due to the brittle phase of BCC and silicide phase. The high-temperature hardness of NbTaWMoSix alloys is increased with the addition of Si, but the same alloy presents a slightly decreasing phenomenon as the temperature improves.
机译：为了提高高温强度并降低NBTAWMO合金的密度，采用产生第二相硅化物的光元素Si。难治性NBTAWMOSIX（x = 0,0.25,0.5,0.75）通过火花等离子体烧结产生高熵合金。在该研究中研究了相蒸变，微观结构，压缩机械性能和高温硬度。它揭示了基质NBTAWMO合金中仅存在无序的身体中心立方（BCC）相。在添加Si元素后，NBTAwmosix合金证明了多相结构的存在：无序的BCC相和硅化物相。随着Si的含量增加，硅化物的比例增加，这提高了硬度和强度。在某些浓度（x = 0.25和0.5）下加入Si对合金的延展性具有阳性作用。由于BCC和硅化物相的脆性，合金均表现出脆性断裂。随着Si的添加，NBTAWMosix合金的高温硬度增加，但是相同的合金呈稍微减少现象，随着温度改善。

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  • 来源
    《Journal of Materials Science》 |2019年第7期|共8页
  • 作者

    Guo Zhiming; Zhang Aijun; Han Jiesheng; Meng Juhu;

  • 作者单位

    Chinese Acad Sci Lanzhou Inst Chem Phys State Key Lab Solid Lubricat Lanzhou 730000 Gansu Peoples R China;

    Chinese Acad Sci Lanzhou Inst Chem Phys State Key Lab Solid Lubricat Lanzhou 730000 Gansu Peoples R China;

    Chinese Acad Sci Lanzhou Inst Chem Phys State Key Lab Solid Lubricat Lanzhou 730000 Gansu Peoples R China;

    Chinese Acad Sci Lanzhou Inst Chem Phys State Key Lab Solid Lubricat Lanzhou 730000 Gansu Peoples R China;

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  • 正文语种 eng
  • 中图分类 工程材料学;
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