Electron Microscopy Study of Eutectic Structure in Nb-Ti-X and Nb-Zr-X (X = Co, Ni) Hydrogen Permeation Alloys

Abstract

The morphology and crystallography of eutectic structures in several niobium-bearing hydrogen permeation alloys such as Nb

Crystallization and microstructure changes in rapidly solidified Nb20Ti40Ni40 hydrogen permeation alloy

“…This is now under study and will be reported in due course. It should be noted that the crystallized Nb 20 Ti 40 Ni 40 melt-spun ribbon consists of the duplex structure with the cube-on-cube orientation relationship which is quite different from the eutectic structure with a fine lamellar morphology in the Nb 20 Ti 40 Ni 40 cast alloy [8][9][10].…”

Microstructural Changes and Hydrogen Permeability of Rolled and Annealed Nb₃₀Ti₃₅Co₃₅ Alloys

“…Unlike for the NbTiNi alloys, it was reported that two types of misfit dislocation exist in the as-cast NbTiCo alloy; they form a complex phase boundary structure. 39) It is considered that these difference of phase boundary structures affects hydrogen permeability in Nb TiCo alloys. For a practical use of NbTiCo and NbTiNi alloys as hydrogen permeable alloys, it is essential to analyze not only the volume fraction of the (Nb, Ti) phase and microstructural morphology but also detailed microstructure including phase boundary structure.…”