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, M. S. Darguschd, J. M. Cairney.
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.