Nucleation driving force for ω-assisted formation of α and associated ω morphology in β-Ti alloys
T. Li, D. Kent, G. Sha, H. Liu, S. G. Fries, A. V. Ceguerra, J. M. Cairney, M. S. Dargusch.
Scripta Materialia, 155, 149-154, (2018)
The structural and chemical changes at ω/β interfaces and the evolution of the morphology of ω in a near-β alloy during isothermal ageing at 573 K were investigated by atom probe tomography and aberration-corrected high-resolution transmission electron microscopy. Ledges and local O enrichment at semi-coherent isothermal ω interfaces are proposed to provide the key driving force for nucleation of ω-assisted α. Following nucleation of α, the morphology of ω evolves from ellipsoidal to rod-like, induced by rapid consumption of ω by α.