A high throughput investigation of Al and Cr additions to the Ti-Fe system via diffusion couple technique, and the oxidation characteristics of a microstructural gradient

P. O’Kelly, C. Schlereth, G. Schmidt, K. Beck, M.C. Galetc, A.J. Knowles

Corrosion Science 244 (2025), 112604, DOI: 10.1016/j.corsci.2024.112604

O_Kelly2024_fig13

EPMA elemental distribution maps from the Ti-Fe-Cr side of the diffusion couple following isothermal exposure at 650 °C for 500 h in laboratory air. Note the absence of a strong Cr signal from the external oxide.
Reprinted from Corrosion Science with permission from Elsevier according to the Creative Commons CC-BY license.

A diffusion couple of Ti-Fe-Al to Ti-Fe-Cr alloys was assembled to rapidly assess the effects of Al and Cr additions to the Ti-Fe binary system. The entire Ti-Fe-Al-Cr compositional and microstructural gradient was oxidised at 650 °C for various time periods. Multi-layered scales formed across the entire gradient, dominated by rutile-TiO2, but also containing discontinuous alumina-Al2O3 and hematite-Fe2O3. A composition Ti-16Fe-4.5Al-5.8Cr (at%) corresponding to the bcc-B2 target microstructure was determined, and the stability of these oxides was evaluated through a standard thermodynamic methodology. The calculations suggest that secondary oxides do not form at the alloy/TiO2 interface.

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