Compression and Shear of Tantalum to 64 GPa

ORAL

Abstract

It has been reported that the $\beta $-phase (body-centered-cubic) of tantalum (Ta) is stable to pressures over mega-bar under hydrostatic compression.[1] However, the shock compression clearly indicates its transformation to the $\omega $-phase (hexagonal) at 45 GPa.[2] Theoretical work suggests that the shear might have played an important role in inducing this phase transformation.[3] Here we report our experimental results on the effects of pressure and shear by use of a rotational diamond anvil cell and the synchrotron X-ray diffraction. The results indicate that under extensive shear and pressures over 60 GPa, Ta remains stable in the $\beta $ phase. \\[4pt] [1] H. Cynn and C.-S. Yoo, ``Phy. Rev. B'' \textbf{59}, 8526 (1999)\\[0pt] [2] L. M. Hsiung and D. H. Lassila, ``Scr. Mater.'' \textbf{38}, 1371 (1998)\\[0pt] [3] D. Mukherjee, K. D. Joshi, S. C. Gupta, ``J. Phys. Conf. Ser.'' 377, 012072 (2012)

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Authors

  • Yanzhang Ma

    Department of Mechanical Engineering, Texas Tech University, Lubbock, Texas 79409, USA, Department of Mechanical Engineering, Texas Tech University, Lubbock TX 79409, USA

  • Wenge Yang

    Advanced Photon Source, Argonne National Lab, High Pressure Synergetic Consortium, Carnegie Institution of Washington, Argonne, IL 60439, USA

  • Cheng Ji

    High Pressure Synergetic Consortium, Carnegie Institution of Washington, Argonne, IL 60439, USA

  • Yang Gao

    Department of Mechanical Engineering, Texas Tech University, Lubbock TX 79409, USA

  • Oliver Tschauner

    High Pressure Science and Engineering Center, University of Nevada, Las Vegas, NV 89514, USA

  • Stanislav Sinogeikin

    High Pressure Collaborative Access Team, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, IL 60439, USA