This study designed a series of low-cost Al_xCrFe₂Ni₂ high-entropy alloys with different Al contents (x = 0.1-1.0 at.) and investigated their microstructure and mechanical properties. The XRD analysis revealed that, with an increase in the Al content, their crystalline structures changed from the initial single face-centered cubic (FCC) one to FCC plus body-centered cubic (BCC) and ordered BCC (B2) structures. The tensile strength and hardness first increased and then dropped with increasing Al content related to the volume fraction of the FCC/BCC phase. At x = 0.9, the as-cast alloy containing 49.1 pct BCC phase exhibited the highest ultimate tensile strength of 1278 MPa with a 12.6 pct ductility. With an increase in the Al content, the alloy fracture mechanism changed from ductile fracture to brittle.

本研究设计了一系列低成本的Al含量不同（x  = 0.1-1.0 at。）的Al _x CrFe ₂ Ni ₂高熵合金，并研究了它们的显微组织和力学性能。XRD分析表明，随着Al含量的增加，其晶体结构从最初的单面心立方（FCC）变为FCC加体心立方（BCC）和有序BCC（B2）结构。随着与FCC / BCC相体积分数有关的Al含量的增加，抗拉强度和硬度首先增加，然后下降。在x = 0.9，包含49.1 pct BCC相的铸态合金表现出最高的极限拉伸强度1278 MPa，延展性为12.6 pct。随着Al含量的增加，合金的断裂机理从韧性断裂变为脆性。