To find high-temperature high-entropy alloys, a series of quaternary non-equimolar Al_xCo₁₅Cr₁₅Ni_70-x (x in atomic ratio, 0 ≤ x ≤ 35) alloys was designed, based on the Al-Ni binary system and prepared by arc-melting. The crystal structure, microstructure, and compressive properties of these alloys at both room and high temperatures were characterized. This Al_xCo₁₅Cr₁₅Ni_70-x system showed a lattice structure transition from face-centered cubic (FCC) to body-centered cubic (BCC), as the Al content was increased. In the Al content range of 12.5–19.3 at%, the L1₂ structured γ′ phase formed and strengthened the alloys greatly at both room and elevated temperatures. The alloy with an Al content of 19.3 at% has lamellar eutectic structure composed of γ′ and B2 phases. Due to the high γ′ phase fraction of 70 vol%, this alloy has a compressive yield strength of 924 MPa and a fracture strain of 29% at room temperature as well as good yield strength at high temperatures. Due to its high Al content, this alloy has a density of 7.25 g/cm³, 20% lower than that of the Inconel 718 alloy. At 1123 K, its specific yield strength is about twice that of the Inconel 718.

为了找到高温高熵合金，基于Al-Ni二元合金，设计了一系列四元非等位Al _x Co ₁₅ Cr ₁₅ Ni _70-x（x原子比，0≤x≤35）合金系统，并通过电弧熔化制备。表征了这些合金在室温和高温下的晶体结构，微观结构和压缩性能。随着Al含量的增加，该Al _x Co ₁₅ Cr ₁₅ Ni _70-x系统显示出从面心立方（FCC）到体心立方（BCC）的晶格结构转变。在Al含量为12.5-19.3 at％的范围内，L1 ₂在室温和升高的温度下，结构化的γ'相都形成并大大增强了合金的强度。Al含量为19.3at％的合金具有由γ′相和B 2相组成的层状共晶组织。由于70％的高γ'相分数，该合金在室温下具有924 MPa的压缩屈服强度和29％的断裂应变，以及在高温下具有良好的屈服强度。由于其高的Al含量，该合金的密度为7.25 g / cm ³，比Inconel 718合金的密度低20％。在1123 K时，其比屈服强度约为Inconel 718的两倍。