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Measurement of Body-Centered-Cubic Aluminum at 475 GPa
D N Polsin1,2, D E Fratanduono3, J R Rygg1,2,4
1Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA.
Abstract:
Nanosecond in situ x-ray diffraction and simultaneous velocimetry measurements were used to determine the crystal structure and pressure, respectively, of ramp-compressed aluminum at stress states between 111 and 475 GPa. The solid-solid Al phase transformations, fcc-hcp and hcp-bcc, are observed at 216±9 and 321±12 GPa, respectively, with the bcc phase persisting to 475 GPa. The high-pressure crystallographic texture of the hcp and bcc phases suggests close-packed or nearly close-packed lattice planes remain parallel through both transformations.
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