J. Mater. Sci. Technol. ›› 2020, Vol. 43: 32-39.DOI: 10.1016/j.jmst.2020.01.020

• Research Article • Previous Articles     Next Articles

New FeNiCrMo(P, C, B) high-entropy bulk metallic glasses with unusual thermal stability and corrosion resistance

Yanhui Li, Siwen Wang, Xuewei Wang, Meiling Yin, Wei Zhang*()   

  1. Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, China
  • Received:2019-08-02 Revised:2019-09-06 Accepted:2019-09-23 Published:2020-04-15 Online:2020-04-26
  • Contact: Zhang Wei

Abstract:

New Fe20-35Ni20Cr20-30Mo5-15(P0.6C0.2B0.2)20 bulk metallic glasses with excellent thermal stability, strength, and corrosion resistance have been developed through the high-entropy alloy design strategy. The high-entropy bulk metallic glasses (HE-BMGs) possess larger supercooled liquid regions of ~69 K, higher crystallization onset temperatures of ~852 K, larger undercoolings of ~109 K, and more sluggish crystallization process upon heating than the conventional metallic glass benefited from the high mixing entropy effect. The HE-BMGs also exhibit ultrahigh strength of ~3.4 GPa, Vickers hardness of ~1107, and superior corrosion resistance in acids and NaCl solutions by formation of highly stable Cr- and Mo-enriched passive films. The new metal-metalloid HE-BMG system and exceptional properties give the alloys good promise for both scientific and engineering applications.

Key words: High-entropy bulk metallic glasses, Thermal stability, Crystallization, Corrosion resistance, FeNiCrMo(P,C,B) alloys