title: Direct determination of metastable phase diagram by synchrotron radiation experiments on undercooled metallic melts.
abstract: The phase selection process during the crystallization of undercooled metallic melts is studied in situ by combining the electromagnetic levitation technique with energy dispersive x-ray diffraction of synchrotron radiation. The crystallization of metastable bcc phase in binary Ni-V alloys was identified. A metastable phase diagram of Ni-V alloy is constructed, which shows the primarily solidifying phase as a function of composition and undercooling. The analysis within nucleation theory emphasizes the important role of metal oxide as a heterogeneous nucleation site controlling the phase selection.
authors.affiliation: Institut für Raumsimulation, Köln, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Notthoff
authors.forename: B
authors.initials: B
authors.lastname: Feuerbacher
authors.forename: H
authors.initials: H
authors.lastname: Franz
authors.forename: D M
authors.initials: DM
authors.lastname: Herlach
authors.forename: D
authors.initials: D
authors.lastname: Holland-Moritz