Fig. 2: Mechanical properties of L-PBF printed Al0.5CrCoFeNi high-entropy alloy at 298 K and 77 K.
a Tensile curves at 298 K and 77 K show yield strength, σy, and ultimate tensile strength, σu increasing by ∼29% and 48%, respectively, at cryogenic temperatures. b Representative true stress, σ, and instantaneous strain hardening rate, dσ/dε vs. true strain, ε plot for specimens tested at 77 K show a change in the slope of the work hardening rate with increasing true strain, ε. The change in slope at the cryogenic temperature indicates a varied deformation mechanism. c The crack-resistance curves (R-curves) show average fracture toughness, KJIc of ∼306 MPa√m and ∼291 MPa√m at 298 K and 77 K, respectively. d The fracture toughness, KJIc of the specimen after the heat treatment at 750 °C for 1 h drops to ∼135 MPa√m and ∼51 MPa√m at 298 K and 77 K, respectively.
