Discovery and characterization of a new Mo_0.6Re_0.4 phase in a Re-containing superalloy

Re element has garnered significant interest due to it can significantly enhance mechanical properties of single crystal superalloys. However, the mechanism is still unclear. The first reported Mo_0.6Re_0.4 new phase in this study provides critical insights for revealing the strengthening mechanism. This phase has a body-centered cubic (bcc) structure, distributed around the primary γ′ phase. High-throughput in-situ characterization demonstrated its content below 0.15 %. It's hard to distinguish and may be easily confused since its low concentration and the morphological and compositional characteristics are similar to known TCP phases.