A new combinatorial approach to assess the influence of alloy composition on the oxidation behavior and concurrent oxygen-induced phase transformations for binary Ti–xCr alloys at 650 °C. (August 2015) - Samimi, Peyman
Highlights: A novel combinatorial approach was employed to investigate the oxidation of Ti–Cr system. Oxidation resistance is significantly increased above ∼20 wt% Cr. Transition to a rapid breakaway oxidation was observed below ∼20 wt% Cr. The multilayer oxide scale comprises TiO2 and gradually dissolving TiCr2 particles. Abstract: Poor oxidation performance of Ti-based alloys is an important life-limiting factor for high temperature applications. In this paper, a combinatorial approach is used to investigate systematically the influence of composition and time on the oxidation of Ti–Cr system. A compositionally graded Ti– x Cr specimen (0 ⩽ x ⩽ 40 wt%) was prepared and oxidized at 650 °C. The structure and composition of the oxide and near-surface region were studied and a critical composition of ∼20 wt% Cr was identified above which the oxidation resistance is enhanced. Below the critical composition transition to a rapid breakaway oxidation was observed for extended exposure times.