In-situ probing of lattice response in shock compressed polycrystalline iron through the $\alpha$-$\epsilon$ transition using single shot x-ray diffraction

Diagnostics which probe the lattice response during shock compression offer insight into many fundamental physical phenomena which govern material response. While diffraction from shocked loaded single crystals has been demonstrated for several years the recent development of in-situ polycrystalline diffraction techniques offers similar levels of insight into materials which are more complicated by nature of having grains of multiple orientations, but are more representative of commonly used materials. We will exam both single and polycrystalline iron shock loaded through the $\alpha$-$\epsilon$ transition. This work was conducted under the auspices of the U.S. DOE by the UC LLNL and LANL under Contract No. W-7405-Eng-48. Additional support was provided by LDRD program Project No. 06-SI-004 at LLNL.