Niobium Base Superalloys: Achievement of a Coherent Ordered Precipitate Structure in the Nb Solid-Solution

摘要: In a previous work, the chemical elements necessary for achievement of Niobium base superalloys were defined in order to get structure equivalent that Nickel superalloys, which contain ordered precipitates within disordered solid-solution. It was especially emphasized precipitation hardening matrix would be possible with addition Ni. The remaining question about design such concerned crystalline coherence Nb i.e., crystal prototype and lattice parameter coherency matrix. reduce trial/error experimental reasoning based on various data is presented. Then, starting from Nb-Hf-Ni ternary alloy thus defined, this paper demonstrates an phase can achieved between chemistry crystallographic characterized using Transmission Electron Microscopy Atom Probe Tomography. These results help conceive new family superalloys.