Progress in materials development is often paced by the time required to produce and evaluate a large number of alloys with different chemical compositions. This applies especially to refractory high-entropy alloys (RHEAs), which are difficult to synthesize and process by conventional methods. To evaluate a possible way to accelerate the process, high-throughput laser metal deposition was used in this work to prepare a quinary RHEA, TiZrNbHfTa, as well as its quaternary and ternary subsystems by in-situ alloying of elemental powders. Compositionally graded variants of the quinary RHEA were also analyzed. Our results show that the influence of various parameters such as powder shape and purity, alloy composition, and especially the solidification range, on the processability, microstructure, porosity, and mechanical properties can be investigated rapidly. The strength of these alloys was mainly affected by the oxygen and nitrogen contents of the starting powders, while substitutional solid solution strengthening played a minor role.

材料开发的进展通常取决于生产和评估大量具有不同化学组成的合金所需的时间。这尤其适用于难于通过常规方法合成和加工的难熔高熵合金（RHEA）。为了评估加速该过程的可能方法，这项工作中使用了高通量激光金属沉积技术，通过原位制备了RHEA的五元体系，TiZrNbHfTa及其四元和三元子系统。元素粉末的合金化。还分析了五级RHEA的成分分级变体。我们的结果表明，可以快速研究各种参数（如粉末形状和纯度，合金组成，尤其是凝固范围）对可加工性，显微组织，孔隙率和机械性能的影响。这些合金的强度主要受起始粉末中氧和氮含量的影响，而替代固溶体的强化作用较小。