查看文章

Almost 75 years of research has been devoted to producing superalloys capable of higher operating temperatures in jet turbine engines, and there is an ongoing need to increase operating temperature further. Here, a new disk Nickel-base superalloy is designed to take advantage of strengthening atomic-scale dynamic complexions. This local phase transformation strengthening provides the alloy with a three times improvement in creep strength over similar disk superalloys and comparable strength to a single crystal blade alloy at 760 °C. Ultra-high-resolution chemical mapping reveals that the improvement in creep strength is a result of atomic-scale η (D0₂₄) and χ (D0₁₉) formation along superlattice stacking faults. To understand these results, the energy differences between the L1₂ and competing D0₂₄ and D0₁₉ stacking fault structures and their dependence on composition are computed by density …