Microstructural evolution and local mechanical properties of dendrites in Al0.6CoCrFeNi high entropy alloy

On the Short-Time Thermal Phase-Stability of As-Cast Alcocrfeni2.1 Eutectic High Entropy Alloy

“…Accordingly, the mechanical behavior of the as-cast Al 0.6 CoFeNiCr 0.4 was investigated after thermal treatment in the temperature range of 550e850 C for 24 h, and demonstrated that the formation and evolution of ordered B 2 phase in the course of ageing improved the mechanical properties [13]. The earlier investigations on AlCoCrFeNi [14] and Al 0.6 CoCrFeNi [15] HEAs, revealed that the B 2 precipitates were formed during the aging process due to the transformation of L1 2 nano-precipitates to B 2 needle shape precipitates, which is triggered by the higher thermodynamic stability of B 2 eNiAl precipitates. However, the previous research demonstrated that the formation of the needle shape B 2 phase in primary FCC can be observed through the long-term heat treatments at low-temperature range [16].…”