Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (9): 1053-1064.DOI: 10.1007/s40195-019-00935-x

Special Issue: 2019年腐蚀专辑-2

• Orginal Article •     Next Articles

Microstructure, Mechanical Properties, and Corrosion Behavior of MoNbFeCrV, MoNbFeCrTi, and MoNbFeVTi High-Entropy Alloys

Chao Xiang1,2, Zhi-Ming Zhang2, Hua-Meng Fu3, En-Hou Han2(), Jian-Qiu Wang2, Hai-Feng Zhang3, Guo-Dong Hu3,4   

  1. 1.Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering Northeastern University,Shenyang 110819, China
    2.CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research Chinese Academy of Sciences,Shenyang 110016,China
    3.Shenyang National Laboratory for Materials Science, Institute of Metal Research Chinese Academy of Sciences,Shenyang 110016,China
    4.School of Materials Science and Engineering University of Science and Technology of China, Shenyang 110016, China
  • Received:2019-04-19 Revised:2019-05-20 Online:2019-09-10 Published:2019-08-06

Abstract:

The development of high-entropy alloys (HEAs) has stimulated an ever-increasing interest from both academia and industries. In this work, three novel MoNbFeCrV, MoNbFeCrTi, and MoNbFeVTi HEAs containing low thermal neutron absorption cross section elements were prepared by vacuum arc melting. The microstructure, mechanical properties, and corrosion behaviors were investigated. A dominant body-centered cubic (BCC) phase was present in all these three HEAs. In addition, an ordered Laves phase was found to be another major phase in both MoNbFeCrV and MoNbFeCrTi alloys, whereas an ordered BCC (B2) phase was observed in the MoNbFeVTi alloy. The phase formation in these three alloys was discussed. It is found that the formation of the secondary phase in these alloys is mainly ascribed to the large atomic size difference and electronegativity difference. All the three HEAs show high hardness, high yield strength but limited plasticity. Moreover, the MoNbFeCrV, MoNbFeCrTi and MoNbFeVTi alloys exhibit excellent corrosion resistance in both deaerated 1 mol/L NaCl and 0.5 mol/L H2SO4 solutions at room temperature. However, further composition adjustment and/or thermomechanical processing is required to enhance the mechanical properties of the three alloys.

Key words: High-entropy alloy, Crystal structure, Microstructure, CALPHAD, Mechanical property, Corrosion