In order to reveal the effect of homogenization treatment on the phase composition and chemical distribution of MoNbTa-based refractory multi-component alloys, the microstructures and mechanical properties of as-cast and homogenized (MoNbTa)₆Ti_xV_y (x + y = 4) alloys were investigated by using X-ray diffraction, scanning electron microscopy and mechanics performance tests. Besides, the theoretical elastic properties and bonding behavior were analyzed by the first principle calculations. The results show that except for (MoNbTa)₆Ti_2.5V_1.5 alloy, there are no obvious differences of crystal structures between other as-cast and homogenizing alloys. The lattice constants of (MoNbTa)₆Ti_xV_y alloys increase with the increase of Ti content, while the lattice constants of alloys decrease after homogenization treatment. Typically (Mo, Ta)-rich dendritic and (Ti, V)-rich interdendritic morphologies are observed, and the atoms would diffuse during the homogenization process resulting in the uniform composition. The as-cast (MoNbTa)₆Ti₂V₂ alloy exhibit the largest values of compressive strength, plasticity, and hardness in these alloys. Following homogenization, the mechanical properties of (MoNbTa)₆Ti_xV_y alloys decrease significantly. The results of first principles reveal that the covalent bonding interactions between Ti and V atoms are stronger than that between Mo and Ta atoms in these MoNbTa-based refractory multi-component alloys.

为了揭示均质化处理对 MoNbTa 基难熔多组分合金的相组成和化学分布的影响，对铸态和均质化 (MoNbTa) ₆ Ti _x V _y (x + y = 4)采用X射线衍射、扫描电镜和力学性能测试对合金进行了研究。此外，通过第一性原理计算分析了理论弹性性能和粘合行为。结果表明，除(MoNbTa) ₆ Ti _2.5 V _1.5合金外，其他铸态合金和均质合金的晶体结构没有明显差异。(MoNbTa) 的晶格常数₆ Ti _x V _y合金随着Ti含量的增加而增加，而均质化处理后合金的晶格常数降低。通常观察到富含 (Mo, Ta) 的枝晶和富含 (Ti, V) 的枝晶间形态，并且原子会在均质化过程中扩散，从而导致均匀的成分。铸态 (MoNbTa) ₆ Ti ₂ V ₂合金在这些合金中表现出最大的抗压强度、塑性和硬度值。均质化后，(MoNbTa) ₆ Ti _x V _y的机械性能合金显着减少。第一性原理的结果表明，在这些 MoNbTa 基难熔多组分合金中，Ti 和 V 原子之间的共价键相互作用强于 Mo 和 Ta 原子之间的共价键相互作用。