Publications Details

Measurement of Body-Centered-Cubic Aluminum at 475 GPa

Polsin, D.N.; Fratanduono, D.E.; Rygg, J.R.; Lazicki, A.; Smith, R.F.; Eggert, J.H.; Gregor, M.C.; Henderson, B.H.; Delettrez, J.A.; Kraus, R.G.; Celliers, P.M.; Coppari, F.; Swift, D.C.; McCoy, C.A.; Seagle, Christopher T.; Davis, Jean-Paul D.; Burns, S.J.; Collins, G.W.; Boehly, T.R.

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.