Abstract
A novel CoNiFeNb0.45 eutectic multi-principal element alloy (EMPEA) with a dual-phase structure is designed and synthesized by arc melting and suction casting. The compression strength of the CoNiFeNb0.45 EMPEA is 2.5 GPa at room temperature and high compression strength (1.2 GPa), furthermore, the excellent ductility with 40% fracture strain are maintained at 700 °C. The dislocation walls in the soft fcc phase provide the CoNiFeNb0.45 EMPEA with high ductility and work hardening, while the dislocations pined in the fcc/laves phase boundaries provide the alloy with high strength. The CoNiFeNb0.45 EMPEA also has excellent corrosion resistance in 3.5 wt% NaCl at room temperature as manifested by a corrosion rate of merely 0.003 mm/y and activation energy of corrosion of 53.6 kJ/mol.
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