Alloy design for intrinsically ductile refractory high-entropy alloys

DOI PDF 被引用文献11件
  • Saad Sheikh
    Chalmers University of Technology 1 Department of Materials and Manufacturing Technology, , Gothenburg 41296, Sweden
  • Samrand Shafeie
    Chalmers University of Technology 1 Department of Materials and Manufacturing Technology, , Gothenburg 41296, Sweden
  • Qiang Hu
    Jiangxi Academy of Sciences 2 Institute of Applied Physics, , Nanchang 330029, People's Republic of China
  • Johan Ahlström
    Chalmers University of Technology 1 Department of Materials and Manufacturing Technology, , Gothenburg 41296, Sweden
  • Christer Persson
    Chalmers University of Technology 1 Department of Materials and Manufacturing Technology, , Gothenburg 41296, Sweden
  • Jaroslav Veselý
    UJP PRAHA a.s. 3 , Nad Kamínkou 1345, Prague 15610, Czech Republic
  • Jiří Zýka
    UJP PRAHA a.s. 3 , Nad Kamínkou 1345, Prague 15610, Czech Republic
  • Uta Klement
    Chalmers University of Technology 1 Department of Materials and Manufacturing Technology, , Gothenburg 41296, Sweden
  • Sheng Guo
    Chalmers University of Technology 1 Department of Materials and Manufacturing Technology, , Gothenburg 41296, Sweden

抄録

<jats:p>Refractory high-entropy alloys (RHEAs), comprising group IV (Ti, Zr, Hf), V (V, Nb, Ta), and VI (Cr, Mo, W) refractory elements, can be potentially new generation high-temperature materials. However, most existing RHEAs lack room-temperature ductility, similar to conventional refractory metals and alloys. Here, we propose an alloy design strategy to intrinsically ductilize RHEAs based on the electron theory and more specifically to decrease the number of valence electrons through controlled alloying. A new ductile RHEA, Hf0.5Nb0.5Ta0.5Ti1.5Zr, was developed as a proof of concept, with a fracture stress of close to 1 GPa and an elongation of near 20%. The findings here will shed light on the development of ductile RHEAs for ultrahigh-temperature applications in aerospace and power-generation industries.</jats:p>

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