Phase and structural changes during heat treatment of additive manufactured CrFeCoNi high-entropy alloy

Microstructure and mechanical properties of mechanically-alloyed CoCrFeNi high-entropy alloys using low ball-to-powder ratio

“…This is due to the differences in their melting temperatures and atomic bonds After sintering, a few FCC phases are formed. The three (or two in S-40) structures have lattice constants similar to those of CoCrFeNi HEAs (0.357 nm), as detected previously by XRD in [6,19,38].…”

Post-processing treatments–microstructure–performance interrelationship of metal additive manufactured aerospace alloys: A review

“…The evenly dispersed (ordered) B2 phase in the as-built alloy was transformed into a heterogeneous microstructure having enrichment of Fe-Ni-Cr and Ni-Al FCC phases with a small number of Fe-Cr BCC phases [155]. The heat treatment of the MAM-produced CrFeCoNi alloy was studied by Kuzminova et al [156] under different temperature levels (400°C-1000°C) for 24 h. The temperature at 400°C did not induce recrystallisation but aided the recovery process in the alloy [156]. The hardening effect owing to the commencement of the polygonisation process occurred in the alloy at 500°C after the migration of dislocations to the grain boundaries [156].…”

“…The heat treatment of the MAM-produced CrFeCoNi alloy was studied by Kuzminova et al [156] under different temperature levels (400°C-1000°C) for 24 h. The temperature at 400°C did not induce recrystallisation but aided the recovery process in the alloy [156]. The hardening effect owing to the commencement of the polygonisation process occurred in the alloy at 500°C after the migration of dislocations to the grain boundaries [156]. However, the full polygonisation process and grain growth ensued in the alloy at 600°C and over 700°C respectively [156].…”

“…The hardening effect owing to the commencement of the polygonisation process occurred in the alloy at 500°C after the migration of dislocations to the grain boundaries [156]. However, the full polygonisation process and grain growth ensued in the alloy at 600°C and over 700°C respectively [156]. The annealing temperature of 900°C and beyond (for 24 h) produced the preferred texture and aided the formation of secondary phases [156].…”

“…However, the full polygonisation process and grain growth ensued in the alloy at 600°C and over 700°C respectively [156]. The annealing temperature of 900°C and beyond (for 24 h) produced the preferred texture and aided the formation of secondary phases [156]. However, no σ-phase was formed in the alloy, which demonstrated the stability of the CrFeCoNi alloy at annealing temperatures between 400°C and 1000°C [156].…”