Recovery Studies of Shocked Iron Single Crystals

ORAL

Abstract

Time resolved, in-situ X-Ray diffraction measurements indicate that the bcc-hcp transition in single crystal iron occurs at about 13 GPa. These results also show that the high pressure phase is a polycrystal with two variants. Further studies on the recovered specimens using transmission electron microscopy show that these shocked samples surprisingly reverse transform from a high pressure polycrystal to the original single crystal structure upon release. These results will be discussed in the context of the time resolved data and theoretically based transformation pathways.

*This work was performed under the auspices of the U.S. Department of Energy by University of California, Lawrence Livermore National Laboratory under Contract W-7405-Eng-48. The project (06-SI-004) was funded by the LDRD Program at LLNL.

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Authors

  • Bassem El-Dasher

    • Lawrence Livermore National Laboratory

  • Nathan Barton

    • Lawrence Livermore National Laboratory

  • Warren MoberlyChan

    • Lawrence Livermore National Laboratory

  • J. McNaney

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore National Laboratory, Livermore

  • James Hawreliak

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore National Laboratory, Livermore
    • LLNL

  • H. Lorenzana

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore National Laboratory, Livermore