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Complexion-mediated martensitic phase transformation in Titanium

Author

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  • J. Zhang

    (Max-Planck-Institut für Eisenforschung
    State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University)

  • C. C. Tasan

    (Massachusetts Institute of Technology)

  • M. J. Lai

    (Max-Planck-Institut für Eisenforschung)

  • A. -C. Dippel

    (Deutsches Elektronen-Synchrotron DESY)

  • D. Raabe

    (Max-Planck-Institut für Eisenforschung)

Abstract

The most efficient way to tune microstructures and mechanical properties of metallic alloys lies in designing and using athermal phase transformations. Examples are shape memory alloys and high strength steels, which together stand for 1,500 million tons annual production. In these materials, martensite formation and mechanical twinning are tuned via composition adjustment for realizing complex microstructures and beneficial mechanical properties. Here we report a new phase transformation that has the potential to widen the application window of Ti alloys, the most important structural material in aerospace design, by nanostructuring them via complexion-mediated transformation. This is a reversible martensitic transformation mechanism that leads to a final nanolaminate structure of α″ (orthorhombic) martensite bounded with planar complexions of athermal ω (a–ω, hexagonal). Both phases are crystallographically related to the parent β (BCC) matrix. As expected from a planar complexion, the a–ω is stable only at the hetero-interface.

Suggested Citation

  • J. Zhang & C. C. Tasan & M. J. Lai & A. -C. Dippel & D. Raabe, 2017. "Complexion-mediated martensitic phase transformation in Titanium," Nature Communications, Nature, vol. 8(1), pages 1-8, April.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms14210
    DOI: 10.1038/ncomms14210
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