We have designed and fabricated four previously unexplored body-centered cubic (BCC) single phase VCrMo, VCrMoNb, VCrMoTa, and VCrMoNbTa refractory medium- to high-entropy alloys using a simple thermodynamic approach. The effectiveness of this approach was further theoretically and experimentally demonstrated by using calculation of phase diagrams (CALPHAD) simulations and arc-melting synthesis, respectively. The elemental segregation could be successfully predicted by the Scheil–Gulliver model. All the samples exhibited as-cast dendritic microstructures with high microhardness values. Finally, a general route is proposed to design equiatomic and non-equiatomic medium- to high-entropy alloys based on the rational selection of a binary system and by adding a premeditated amount of principal elements using a simple thermodynamic parameter.

我们使用简单的热力学方法设计并制造了四种以前未探索过的体心立方 (BCC) 单相 VCrMo、VCrMoNb、VCrMoTa 和 VCrMoNbTa 耐火合金。通过分别使用相图计算 (CALPHAD) 模拟和电弧熔化合成，进一步从理论上和实验上证明了这种方法的有效性。Scheil-Gulliver 模型可以成功预测元素偏析。所有样品都显示出具有高显微硬度值的铸态树枝状微观结构。最后，基于合理选择二元体系并通过使用简单的热力学参数添加预定量的主要元素，提出了设计等原子和非等原子中高熵合金的一般途径。