Refractory High Entropy Alloys (RHEAs) and Refractory Complex Concentrated Alloys (RCCAs) are high-temperature structural alloys ideally suited for use in harsh environments. While these alloys have shown promising structural properties at high temperatures that exceed the practical limits of conventional alloys, such as Ni-based superalloys, exploration of the complex phase-space of these materials remains a significant challenge. We report on a high-throughput alloy processing and characterization methodology, leveraging laser-based metal additive manufacturing (AM) and mechanical testing techniques, to enable rapid exploration of RHEAs/RCCAs. We utilized in situ alloying and compositional grading, unique to AM processing, to rapidly-produce RHEAs/RCCAs using readily available and inexpensive commercial elemental powders. We demonstrate this approach with the MoNbTaW alloy system, as a model material known for having exceptionally high strength at elevated temperature when processed using conventional methods (e.g., casting). Microstructure analysis, chemical composition, and strain rate dependent hardness of AM-processed material are presented and discussed in the context of understanding the structure-properties relationships of RHEAs/RCCAs.

耐火高熵合金（RHEA）和耐火复杂浓缩合金（RCCA）是高温结构合金，非常适合在恶劣的环境中使用。尽管这些合金在高温下表现出令人鼓舞的结构性能，超过了常规合金（例如镍基高温合金）的实际极限，但探索这些材料的复杂相空间仍然是一项重大挑战。我们报告了一种高通量合金加工和表征方法，该方法利用了基于激光的金属增材制造（AM）和机械测试技术，从而能够快速探索RHEA / RCCA。我们利用AM加工特有的原位合金化和成分分级技术，使用易得且便宜的市售元素粉末快速生产RHEA / RCCA。我们用MoNbTaW合金系统演示了这种方法，该模型系统是使用常规方法（例如铸造）加工时在高温下具有异常高强度的模型材料。在理解RHEA / RCCA的结构-特性关系的背景下，介绍和讨论了AM处理材料的微观结构分析，化学成分和应变速率相关的硬度。