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Interplay between diffusive and displacive phase transformations: time-temperature-transformation diagrams and

Mathieu Bouville1, Rajeev Ahluwalia

  • 1Institute of Materials Research and Engineering, Singapore 117602. m-bouville@imre.a-star.edu.sg

Physical Review Letters
|October 10, 2006
PubMed
Summary
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This study uses a Ginzburg-Landau model to explore material transformations, predicting mixed microstructures like martensite-retained austenite and martensite-pearlite in alloys such as steels.

Area of Science:

  • Materials Science
  • Physical Chemistry
  • Condensed Matter Physics

Background:

  • Materials can exhibit both rapid displacive and slow diffusive transformations.
  • Understanding microstructure evolution is crucial for alloy design, particularly for steels.
  • Time-temperature-transformation (TTT) diagrams are essential for predicting phase transformations.

Purpose of the Study:

  • To investigate materials undergoing both displacive and diffusive transformations.
  • To model microstructure formation using a Ginzburg-Landau framework.
  • To predict the formation of mixed microstructures and their stabilizing factors.

Main Methods:

  • Utilized a Ginzburg-Landau theoretical framework.
  • Simulated the interplay between diffusive and displacive transformation mechanisms.

Related Experiment Videos

  • Analyzed intrinsic volume changes associated with phase transformations.

    • Main Results:

    • The Ginzburg-Landau model successfully captures key physics of microstructure formation.
    • The model predicts the formation of mixed microstructures through coupled mechanisms.
    • Intrinsic volume changes were identified as stabilizing factors for mixed microstructures.

    Conclusions:

    • A unified Ginzburg-Landau approach can describe diverse transformation kinetics.
    • The model provides insights into the stability of mixed microstructures, such as martensite-retained austenite and martensite-pearlite.
    • This framework is applicable to understanding alloy behavior, including steels.