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The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
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Measurement of Body-Centered-Cubic Aluminum at 475 GPa.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • High-Pressure Science

Background:

  • Understanding material behavior under extreme pressures is crucial for various scientific and industrial applications.
  • Aluminum's phase transformations at high pressures are not fully understood.
  • Previous studies have provided limited data on aluminum's crystallographic changes under dynamic compression.

Purpose of the Study:

  • To investigate the solid-solid phase transformations in aluminum under ramp compression.
  • To determine the precise pressure conditions for aluminum's face-centered cubic (fcc) to hexagonal close-packed (hcp) and hcp to body-centered cubic (bcc) phase transitions.
  • To analyze the crystallographic texture of aluminum phases at extreme stress states.

Main Methods:

  • Utilized nanosecond in situ x-ray diffraction to probe crystal structure.
  • Employed simultaneous velocimetry measurements to determine pressure.
  • Applied ramp compression techniques to aluminum samples, reaching stress states up to 475 GPa.

Main Results:

  • Observed the fcc-hcp phase transformation at 216±9 GPa.
  • Identified the hcp-bcc phase transformation at 321±12 GPa.
  • The bcc phase was observed to persist up to 475 GPa.
  • High-pressure crystallographic texture indicates parallel alignment of close-packed lattice planes through transformations.

Conclusions:

  • Established the pressure-induced phase transformation pathways for aluminum under dynamic compression.
  • Provided critical experimental data on aluminum's high-pressure phases and their structural evolution.
  • The observed crystallographic texture offers insights into the deformation mechanisms of aluminum at extreme conditions.