Aging behavior of two refractory Ti-Nb-(Hf, Zr)-Al high entropy alloys

In the present study, the response of Ti40Nb30Hf15Al15 and Ti40Nb30Zr20Al10 (at%) refractory high entropy alloys to annealing is reported. The alloys were produced by vacuum arc melting and had a density of 7.07 ± 0.03 g/cm3 and 6.03 ± 0.03 g/cm3, respectively. In the as-cast condition, both alloys had a coarse-grained single B2 phase structure. After cold rolling to 80% thickness reduction and annealing at T = 900 °C for 15 min, a fine-grained...