Effect of Mn and V on structure and mechanical properties of high-entropy alloys based on CoCrFeNi system

Abstract

K eyw ords:High-entropy alloys Crystal structure <x phase Mechanical properties M icrostructu re and m echanical prop erties o f eq u im o lar co m p osition alloys FeCrCoNi, FeCrCoNiV, FeCrCoNiM n and FeCrCoNiM nV w e r e studied in a s-solidified and annealed conditions. The FeCrCoNi and FeCrCoNiM n alloys w e r e sin gle-phase FCC solid-solutions in both conditions. H ow ev er, the FeCrCo

Evolution of Microstructure and Mechanical Properties of a CoCrFeMnNi High-Entropy Alloy during High-Pressure Torsion at Room and Cryogenic Temperatures

“…The produced ingots of the CoCrFeMnNi alloy had dimensions of about 6 × 15 × 60 mm 3 . Homogenization annealing was carried out at 1000 • C for 24 h [15,16]. Prior to homogenization, the samples were sealed in vacuumed (10 −2 Torr) quartz tubes filled with titanium chips to prevent oxidation.…”

The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

“…This new type of alloys has attracted much attention due to the formation of simple crystalline structures, such as face-centered cubic (FCC)-, body-centered cubic (BCC)-, and close-packed hexagonal (HCP)-solid solutions, as well as their derivatives, instead of complex intermetallic compounds [6][7][8]. Until now, many HEAs have been reported in diverse systems, e.g., CoCrFeNi-based HEAs [9][10][11][12][13][14], Al-TMs HEAs (TMs: transition metals) [15][16][17][18][19][20][21][22][23], and refractory HEAs [24][25][26][27]. The special structures render HEAs with the unique performance of excellent mechanical properties and superior corrosion-/oxidation-resistances, as examplified by the fact that the single FCC CoCrFeMnNi HEA shows a remarkably high fracture toughness that outperforms all conventional alloys at cryogenic temperatures [3,6,11].…”

The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

“…This new type of alloys has attracted much attention due to the formation of simple crystalline structures, such as face-centered cubic (FCC)-, body-centered cubic (BCC)-, and close-packed hexagonal (HCP)-solid solutions, as well as their derivatives, instead of complex intermetallic compounds [6][7][8]. Till now, many HEAs have been reported in diverse systems, e.g., CoCrFeNi-based HEAs [9][10][11][12][13][14], Al-TMs HEAs (TMs: transition metals) [15][16][17][18][19][20][21][22], and refractory HEAs [23][24][25][26]. The special structures render HEAs with the unique performance of excellent mechanical properties and superior corrosion-/ oxidation-resistances, as exampled by the fact that the single FCC CoCrFeMnNi HEA shows a remarkably high fracture toughness that outperforms all conventional alloys at cryogenic temperatures [3,6,11].…”