Elemental partitioning between α and β phases in the Ti–5Al–5Mo–5V–3Cr–0.5Fe (Ti-5553) alloy

Abstract

Using atom probe tomography, the partitioning of alloying elements between α and β in the alloy Ti metal-5553 (Ti–5Al–5Mo–5V–3Cr–0.5Fe) has been investigated as a function of heat-treatment. It has been shown that β-solutionizing followed by step-quenching to a higher temperature (700°C) or slow-cooling leads to substantial partitioning of the alloying elements, including an enrichment of slow-diffusing Mo at the α/β interfaces. In contrast, it was found that the combination of β-solutionizing, quenching to room temperature and aging at 400°C leads to rather limited partitioning of these alloying elements.

Keywords:

• titanium
• Ti-5553
• atom probe
• phase transformation
• elemental partitioning
• Mo segregation

Acknowledgements

The authors acknowledge the US Air Force Office of Scientific Research (AFOSR Grant # FA9550-06-1-0193) for financially supporting this study. The authors also acknowledge the Center for Advanced Research and Technology (CART) at the University of North Texas and the Center for the Accelerated Maturation of Materials (CAMM) at the Ohio State University for access to experimental facilities.