A study was made of diffusion between Nb and Ti, at 1023 and 1073K, from a Nb–Ti cylindrical composite that had been mechanically deformed by swaging. It was found that, at both temperatures, most of the diffusion layer formed via the diffusion of Nb into Ti. A plot of diffusion-layer thickness versus t1/2 revealed a linear behavior for both temperatures; with angular coefficients of 0.0867μm/s2 (1023K) and 0.253μm/s2 (1073K). Longer heat treatments and higher temperatures led to a Ti-rich diffusion layer.

Diffusion between Nb and Ti Related to Superconductor Wire Processing. C.Bormio-Nunes, C.A.Nunes, F.S.A.Porto, V.S.de Souza, M.A.Tirelli, E.R.Edwards: Superconductor Science and Technology, 2003, 16[4], 521-6