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 C T, Davis J-P, Burns S J, Collins G W, Boehly T R
Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA.
Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA.
Phys Rev Lett. 2017 Oct 27;119(17):175702. doi: 10.1103/PhysRevLett.119.175702.
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.
利用纳秒原位X射线衍射和同步测速测量分别确定了在111至475吉帕应力状态下斜坡压缩铝的晶体结构和压力。分别在216±9吉帕和321±12吉帕观察到fcc-hcp和hcp-bcc的固-固铝相变，bcc相持续到475吉帕。hcp相和bcc相的高压晶体织构表明，在这两种相变过程中，密排或近密排晶格平面保持平行。
