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Title: Theoretical Assessment on the Phase Transformation Kinetic Pathways of Multi-component Ti Alloys: Application to Ti-6Al-4V

Here we present our theoretical assessment of the kinetic pathways during phase transformations of multi-component Ti alloys. Employing the graphical thermodynamic approach and an integrated free energy function based on the realistic thermodynamic database and assuming that a displacive structural transformation occurs much faster than long-range diffusional processes, we analyze the phase stabilities of Ti-6Al-4V (Ti-6wt.%Al-4wt.%V). Our systematic analyses predict a variety of possible kinetic pathways for β to (α + β) transformations leading to different types of microstructures under various heat treatment conditions. In addition, the possibility of unconventional kinetic pathways is discussed. Lastly, we also briefly discuss the application of our approach to general multicomponent/multiphase alloy systems.
ORCiD logo [1] ;  [2] ;  [3] ;  [1]
  1. Pennsylvania State Univ., University Park, PA (United States). Dept. of Material Sciences and Engineering
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Materials Science Division
  3. CompuTherm LLC, Madison, WI (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 1547-7037
Grant/Contract Number:
AC52-07NA27344; FA8650-12-2-7230
Accepted Manuscript
Journal Name:
Journal of Phase Equilibria and Diffusion
Additional Journal Information:
Journal Volume: 37; Journal Issue: 1; Journal ID: ISSN 1547-7037
ASM International
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
Country of Publication:
United States
36 MATERIALS SCIENCE; alloys; kinetics; multicomponent; phase transformation; stability