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Kinetic Pathways of Phase Transformations in Two-Phase Ti Alloys

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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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Author notes

  1. Tae Wook Heo (Postdoctoral Research Staff Member, Previously, Post-Doctoral Scholar)

    Present address: Condensed Matter and Materials Division, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA

Authors and Affiliations

  1. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, 16802, USA

    Tae Wook Heo (Postdoctoral Research Staff Member, Previously, Post-Doctoral Scholar) & Long-Qing Chen (Distinguished Professor)

  2. Boeing Research & Technology, St. Louis, MO, 63166, USA

    Donald S. Shih (Technical Fellow)

Authors
  1. Tae Wook Heo
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  2. Donald S. Shih
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Correspondence to Tae Wook Heo.

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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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