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

Ji, Yanzhou; Heo, Tae Wook; Zhang, Fan; Chen, Long-Qing

doi:10.1007/s11669-015-0436-9

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

Journal Article · Mon Dec 21 00:00:00 EST 2015 · Journal of Phase Equilibria and Diffusion

DOI:https://doi.org/10.1007/s11669-015-0436-9· OSTI ID:1262190

^[1]; Heo, Tae Wook ^[2]; Zhang, Fan ^[3]; Chen, Long-Qing ^[1]

Pennsylvania State Univ., University Park, PA (United States). Dept. of Material Sciences and Engineering
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Materials Science Division
CompuTherm LLC, Madison, WI (United States)

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.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344; FA8650-12-2-7230

OSTI ID:: 1262190

Report Number(s):: LLNL-JRNL-673240

Journal Information:: Journal of Phase Equilibria and Diffusion, Vol. 37, Issue 1; ISSN 1547-7037

Publisher:: ASM InternationalCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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

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