The strength properties of cast solid-solution high-entropy alloys based on bcc and fcc lattices in the temperature range from -70 to 900°C have been investigated. Melting ingots weighing up to 200 g were carried out in a vacuum-arc furnace MIFI-9 by melting the mixture in an atmosphere of purified argon with a non-consumable tungsten electrode on a water-cooled copper hearth. The X-ray phase analysis and scanning electron microscopy in combination with INCA X-ray microanalyzer were used. Hardness (H_IT) and reduced elastic modulus (E_r) were determined using automatic microindentation on a Micron-gamma device using the Berkovich pyramid with a 2 N load in accordance with ISO14577-1:2015. High-temperature indentation of the Vickers pyramid was carried out at a 9.8 N load in vacuum. Thehigh-entropy composition of Nb1.5Cr1.25MoV0.75Ta0.5, which is a solid solution based on the bcc lattice, is characterized by high values of hardness up to 900°C. The yield stress and plasticity of solid-solution alloys are determined depending on the temperatures of the compression tests and the type of crystal lattice. For the high-entropy composition TiZrHfVNbTa based on the bcc lattice, the yield points are almost twice as high as those of the CrMnFeCoNi composition based on the fcc lattice. To create high-entropy alloys with improved characteristics of hot hardness, it is necessary to take into account such factors as the melting point, enthalpy of mixing, and dimensional mismatch in the lattice. It was found that alloys based on bcc lattice at positive values of the enthalpy of mixing are characterized by high characteristics of plasticity and deformability, as well as normalized hardness H_IT/E_r and compressive yield strength at room temperature. This can be attributed to the cluster structure and distortion of the crystal lattice.

研究了基于bcc和fcc晶格的铸造固溶高熵合金在-70至900°C的温度范围内的强度性能。在真空电弧炉MIFI-9中，通过在纯氩气气氛中用不消耗钨的钨电极在水冷的铜炉上熔化混合物，来熔化重达200 g的铸锭。X射线相分析和扫描电子显微镜与INCA X射线微分析仪结合使用。硬度（H _IT）和降低的弹性模量（E _r）是根据ISO14577-1：2015，使用带有2 N载荷的Berkovich金字塔在Micron-γ设备上使用自动微压痕确定的。维氏金字塔的高温压痕在真空下于9.8 N的负载下进行。Nb1.5Cr1.25MoV0.75Ta0.5的高熵组成是基于bcc晶格的固溶体，其特征在于硬度高达900°C。固溶合金的屈服应力和可塑性取决于压缩试验的温度和晶格的类型。对于基于bcc晶格的高熵成分TiZrHfVNbTa，其屈服点几乎是基于fcc晶格的CrMnFeCoNi成分的屈服点的两倍。为了制造出具有改善的热硬度特性的高熵合金，必须考虑诸如熔点，混合焓和晶格尺寸失配等因素。已发现，在混合焓为正值时，基于bcc晶格的合金具有较高的可塑性和变形性以及归一化硬度H的特征。室温下的_IT / E _r和抗压屈服强度。这可以归因于簇结构和晶格变形。