at the Advanced Photon Source

Micro-focused white beam Laue diffraction at HPCAT

Laue diffraction setup optimized for microstructural studies at high pressure is available for users at 16BMB beamline of the Advanced Photon Source.

In the transmission geometry, the limited opening of the diamond cells is overcome especially when using incident beam energies up to ~90 keV which assures sufficient number of reflections to be observed. With a typical beam size of ~2x2 um and the use of rapid 2D positional scanning, both spatial and time resolved measurements can be performed in a matter of seconds.

  • Crystal morphology
  • Local texture
  • Twinning
  • Orientation relations between inter grown crystals
  • Lattice rotation
  • Deviatoric strain
  • Crystal lattice defects

Some examples of research areas using the new Laue setup include: elastic and plastic deformation under hydrostatic or non-hydrostatic stress, pressure induced phase transitions, and melting and crystallization under high pressure.

In-house developed software:

  • polyLaue: developed by D. Popov. Python code to index Laue diffraction data and build maps of reflections. This code is to be combined with Dioptas and Fit2d. This program is available upon request.
  • indexLaue: Evgenii Vasilev transferred modules for indexation from polyLaue to MATLAB code, combined with suitable GUI to visualize and map Laue reflections. This program is available for download from GitHub: https://github.com/avellko/IndexLaue

For additional information, see:

  1. Daniel Yin, Bibhu Sahu, Phillip Tsurkan, Dmitry Popov, Avinash M. Dongare, Nenad Velisavljevic, Amit Misra.  (2024)
    High-Pressure Phase Transitions in a Laser Directed Energy Deposited Fe-33Cu Alloy
    Acta Materialia, 268, 119797 
  2. Evgenii Vasilev, Dmitry Popov, Maddury Somayazulu, Nenad Velisavljevic, Marko Knezevic  (2023)
    White Laue and powder diffraction studies to reveal mechanisms of HCP-to-BCC phase transformation in single crystals of Mg under high pressure
    Sci. Rep. 13, 2173
  3. Arya Chatterjee, Dmitry Popov, Nenad Velisavljevic, and Amit Misra.  (2022)
    Phase Transitions of Cu and Fe at Multiscales in an Additively Manufactured Cu–Fe Alloy under High-Pressure
    Nanomater. 12 (9), 1514
  4. Hao Chen, Valery I. Levitas, Dmitry Popov, and Nenad Velisavljevic.  (2022) 
    Nontrivial nanostructure, stress relaxation mechanisms, and crystallography for pressure-induced Si-I→Si-II phase transformation
    Nature Communications 13, 982
  5. Popov, Dmitry; Nenad Velisavljevic, and Maddury Somayazulu. (2019)
    Mechanisms of Pressure-Induced Phase Transitions by Real-Time Laue Diffraction
    Crystals 9, 12: 672
  6. Popov, D., N. Velisavljevic, Wenjun Liu, R. Hrubiak, Changyong Park, and G. Shen. (2019)  Real time study of grain enlargement in zirconium under room-temperature compression across the [alpha] to [omega] phase transition 
    Sci. Rep. 9, 15712-1-15712-7
  7. Popov D. et al. (2019)
    New Laue Micro-diffraction Setup for Real-Time In Situ Microstructural Characterization of Materials Under External Stress
    In: Nakano J. et al. (eds) Advanced Real Time Imaging II. The Minerals, Metals & Materials Series. Springer, Cham
  8. Popov, D., C. Park, C. Kenney-Benson, and G. Shen.  (2015)
    High pressure Laue diffraction and its application to study microstructural changes during the α→β phase transition in Si
    Rev. Sci. Instrum. 86, 072204
  9. R. Barabash, O. Barabash, D. Popov, G. Shen, C. Park and W. Yang.  (2015)
    Multiscale twin hierarchy in NiMnGa shape memory alloys with Fe and Cu.
    Acta Materialia, 2015, 87, 344-349