High-entropy alloys(HEAs)have significant application prospects as promising candidate materials for nuclear industry due to their excellent mechanical properties,corrosion resistance and irradiation resistance.In this work,the Mo0.25V0.25Ti1.5Zr0.5Nbx(x=0,0.25,0.5,0.75 and 1.0)HEAs were designed and fabricated.The alloys were prepared by vacuum arc melting,and all the ingots were annealed at 1200℃for 24 h.The microstructures,crystal structures,hardness and mechanical properties of Mo0.25V0.25Ti1.5Zr0 5Nbx HEAs were investigated.The as-cast alloys are composed of single BCC phase.Moreover,the single BCC phase is retained after annealing at 1200℃for 24 h.The compressive and microhardness tests show that the strength and hardness of the alloys decrease gradually with the increase of Nb content,while the plasticity increases and the fracture mode of the alloy changes from brittle fracture to ductile fracture,which is mainly owing to the decrease of grain size.The addition of Nb significantly improves the plasticity of the Mo0.25V0.25Ti1.5Zr0.5Nbx alloys.In particular,Nb1.0 alloy can reach 28.32％strain without fracture,which exhibits promising potential in industrial application.

Fengqi Zhang;Chao Xiang;En-Hou Han;Zijian Zhang

Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China;Institute of Corrosion Science and Technology,Guangzhou 510530,China

金属学报（英文版）

[1]Fengqi Zhang;Chao Xiang;En-Hou Han;Zijian Zhang-.Effect of Nb Content on Microstructure and Mechanical Properties of Mo0.25V0.25Ti1.5Zr0.5Nbx High-Entropy Alloys)[J].金属学报（英文版）,2022(10):1641-1652

25V0,25Ti1,5Nbx

Effect,Content,Microstructure,Mechanical,Properties,Mo0,5Zr0,High,Entropy,Alloys,entropy,alloys,HEAs,have,application,prospects,promising,candidate,materials,nuclear,industry,due,their,excellent,mechanical,properties,corrosion,resistance,irradiation,In,this,work,were,designed,fabricated,prepared,by,vacuum,arc,melting,ingots,annealed,microstructures,crystal,investigated,cast,composed,single,BCC,phase,Moreover,retained,after,annealing,compressive,microhardness,tests,show,that,strength,decrease,gradually,content,while,plasticity,increases,fracture,mode,changes,from,brittle,ductile,which,mainly,owing,grain,size,addition,significantly,improves,particular,Nb1,reach,strain,without,exhibits,potential,industrial

0.48402