Multiscale phase transitions of Cu and Fe in an additively manufactured Cu-Fe Alloy under high-Pressure.

ORAL

Abstract

A state of the art custom-built direct-metal deposition (DMD) based additive manufacturing (AM) system at the University of Michigan was used to manufacture 50Cu-50Fe alloy with tailored properties for use in high strain/deformation environments. Subsequently, we performed the first high-pressure compression experiments to investigate the structural stability and deformation of this material. Our work shows that the alpha (BCC) phase of Fe is stable up to ~16 GPa before reversibly transforming to HCP, which is at least a few GPa higher than pure bulk Fe material. Furthermore, we observed evidence of the transition of Cu nano-precipitates in Fe from a well-known FCC structure to a metastable BCC phase, which has only been predicted via density functional calculations. Finally, the metastable FCC Fe nano-precipitates within the Cu grains show a modulated nano-twinned structure induced by high-pressure deformation. The results from this work demonstrate the opportunity in AM application for tailored functional materials and extreme stress/deformation applications.

*This research was performed under the Center for Research Excellence on Dynamically Deformed Solids (CREDDS) sponsored by the Department of Energy - National Nuclear Security Administration (DOE-NNSA), Stewardship Science Academic Program under Award No. DE-NA0003857. Electron microscopy was performed at the Michigan Center for Materials Characterization. NV work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. High-Pressure Collaborative Access Team (HPCAT) (Sector 16), Advanced Photon Source (APS), Argonne National Laboratory. HPCAT operations are supported by DOE-NNSA's Office of Experimental Sciences. The Advanced Photon Source is a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.

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Publication: A Chatterjee, D Popov, N Velisavljevic, A Misra; Phase Transitions of Cu and Fe at Multiscales in an Additively Manufactured Cu–Fe Alloy under High-Pressure; Nanomaterials; 12 (9), 1514; 2022.

Presenters

  • Dmitry Popov

    • HPCAT, X-ray Science Division, Argonne National Laboratory
    • High-pressure Collaborative Access Team, X-ray Science Division, Argonne National Laboratory, Argonne, IL 60439, USA

Authors

  • Arya Chatterjee

    • General Electric Research

  • Dmitry Popov

    • HPCAT, X-ray Science Division, Argonne National Laboratory
    • High-pressure Collaborative Access Team, X-ray Science Division, Argonne National Laboratory, Argonne, IL 60439, USA

  • Nenad Velisavljevic

    • HPCAT, X-ray Science Division, Argonne National Laboratory, Argonne, IL 60439
    • Argonne National Laboratory
    • Lawrence Livermore National Laboratory
    • Lawrence Livermore National Laboratory and Argonne National Laboratory
    • LLNL

  • Amit Misra

    • Department of Materials Engineering, University of Michigan, Ann Arbor