TY - GEN
T1 - The influence of peak shock stress on the high pressure phase transformation in zirconium
AU - Cerreta, Ellen Kathleen
AU - Rigg, P. A.
AU - Addessio, Francis L
AU - Lookman, Turab
AU - Bronkhorst, Curt Allan
AU - Trujillo, Carl Patrick
AU - Brown, Donald William
AU - Dickerson, R. M.
AU - GrayIII, G. T.
AU - Escobedo, J. P.
AU - Dickerson, P. O.
AU - Gray III, G. T.
PY - 2012/12/1
Y1 - 2012/12/1
N2 - At high pressures zirconium is known to undergo a phase transformation from the hexagonal close packed (HCP) alpha phase to the simple hexagonal omega phase. Under conditions of shock loading, the high-pressure omega phase is retained upon release. However, the hysteresis in this transformation is not well represented by equilibrium phase diagrams and currently models that accurately represent such a solid-solid phase transformation coupled with the multi-phase plasticity likely under shock conditions do not exist. For this reason, the influence of peak shock stress on the retention of omega phase in Zr is explored in this study. In-situ VISAR measurements along with post-mortem metallographic and neutron diffraction characterization of soft recovered specimens have been utilized to quantify the volume fraction of retained omega phase, morphology of the shocked alpha and omega phases, and qualitatively understand the kinetics of this transformation. This understanding of the role of peak shock stress will be utilized to address physics to be encoded in our present macro-scale models.
AB - At high pressures zirconium is known to undergo a phase transformation from the hexagonal close packed (HCP) alpha phase to the simple hexagonal omega phase. Under conditions of shock loading, the high-pressure omega phase is retained upon release. However, the hysteresis in this transformation is not well represented by equilibrium phase diagrams and currently models that accurately represent such a solid-solid phase transformation coupled with the multi-phase plasticity likely under shock conditions do not exist. For this reason, the influence of peak shock stress on the retention of omega phase in Zr is explored in this study. In-situ VISAR measurements along with post-mortem metallographic and neutron diffraction characterization of soft recovered specimens have been utilized to quantify the volume fraction of retained omega phase, morphology of the shocked alpha and omega phases, and qualitatively understand the kinetics of this transformation. This understanding of the role of peak shock stress will be utilized to address physics to be encoded in our present macro-scale models.
UR - https://www.scopus.com/pages/publications/84884381815
U2 - 10.1051/epjconf/20122602013
DO - 10.1051/epjconf/20122602013
M3 - Conference contribution
SN - 9782759807574
T3 - EPJ Web of Conferences
BT - DYMAT 2012 - 10th International Conference on the Mechanical and Physical Behaviour of Materials Under Dynamic Loading
T2 - 10th International Conference on the Mechanical and Physical Behaviour of Materials Under Dynamic Loading, DYMAT 2012
Y2 - 1 December 2012
ER -