title: Orientation relations during the α-ω phase transition of zirconium: in situ texture observations at high pressure and temperature.
abstract: Transition metals Ti, Zr, and Hf have a hexagonal close-packed structure (α) at ambient conditions, but undergo phase transformations with increasing temperature and pressure. Of particular significance is the high-pressure hexagonal ω phase which is brittle compared to the α phase. There has been a long debate about transformation mechanisms and orientation relations between the two crystal structures. Here we present the first high pressure experiments with in situ synchrotron x-ray diffraction texture studies on polycrystalline aggregates. We follow crystal orientation changes in Zr, confirming the original suggestion by Silcock for an α→ω martensitic transition for Ti, with (0001)(α)||(1120)(ω), and a remarkable orientation memory when ω reverts back to α.
authors.affiliation: Department of Earth and Planetary Science, University of California, Berkeley, California 94720, USA.
authors.forename: H-R
authors.initials: HR
authors.lastname: Wenk
authors.forename: P
authors.initials: P
authors.lastname: Kaercher
authors.forename: W
authors.initials: W
authors.lastname: Kanitpanyacharoen
authors.forename: E
authors.initials: E
authors.lastname: Zepeda-Alarcon
authors.forename: Y
authors.initials: Y
authors.lastname: Wang