Abstract
Possible phase transformation kinetic pathways from the high temperature β phase to the low temperature (α + β) two-phase Ti alloys were analyzed using the graphical thermodynamic method and the assumption that diffusionless and displacive transformations take place much faster than phase separation which requires long-range diffusion. It is shown that depending on the composition of a β-stabilizing element, many transformation mechanisms are possible, involving competing continuous and discontinuous displacive/diffusional transformations. We discuss the proposed phase transformation sequences employing existing experimental microstructures.
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Acknowledgments
This work is funded by the Center for Computational Materials Design (CCMD), a joint National Science Foundation (NSF) Industry/University Cooperative Research Center at Penn State (IIP-1034965) and Georgia Tech (IIP-1034968).
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Manuscript submitted February 3, 2014.
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Heo, T.W., Shih, D.S. & Chen, LQ. Kinetic Pathways of Phase Transformations in Two-Phase Ti Alloys. Metall Mater Trans A 45, 3438–3445 (2014). https://doi.org/10.1007/s11661-014-2269-2
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DOI: https://doi.org/10.1007/s11661-014-2269-2