The phase diagrams of the systems zirconium-cerium and zirconium-lead have
been determined mainly by the method of quenching and microscopic examinati
on. The zirconium alpha --> beta transformation in the zirconium-cerium sys
tem is lowered and is completed by a eutectoid reaction; there are no inter
metallic compounds, and a range of liquid immiscibility exists on the ceriu
m side of the diagram. Phase relations in the zirconium-lead system have be
en determined up to 20-25 at% lead. The zirconium alpha --> beta transforma
tion is raised and completed by a peritectoid reaction; two intermetallic c
ompounds have been observed corresponding to the compositions Zr4Pb and Zr5
Pb3. The effect of lead on the lattice parameters of zirconium has also bee
n investigated. An Appendix has been added to to provide a thermodynamic re
presentation of the zirconium-rich end of the Zr-Pb phase diagram.