|About this Abstract
||Materials Science & Technology 2012
||In-situ Characterization of Phase Transformations in Materials
||In-Situ Reversion of Metastable -Zirconium during Heating and Straining
||Donald W Brown, Bjorn Clausen, Ellen Cerreta, Thomas Sisneros, Eric Tulk
|On-Site Speaker (Planned)
||Donald W Brown
Diffraction provides a sensitive probe of phase transformations under many environmental conditions. Moreover, neutron diffraction and more recently high-energy synchrotron x-ray diffraction penetrate into the bulk of many materials, providing phase information at depth in the sample. We have used neutron and high-energy x-ray diffraction to monitor the phase evolution of Zr which was previously shock-loaded into the high pressure -phase. In contrast to iron, after the release of the shock, a significant fraction (up to 80%) of the Zr remains quenched in the metastable -phase, providing the opportunity for post-mortem analysis of the resulting microstructure. We observe reversion of the shocked Zr to the stable -phase during heating (expected) and compressive deformation (unexpected). The phase fractions, phase stresses and preferred orientation were monitored during the reversion in multiple samples shocked to different pressures and at different temperatures and will be related to the as-shocked microstructure of the individual samples.