Ternary Phase Equilibria in Transition Metal-Boron-Carbon-Silicon Systems. Part 2. Ternary Systems. Volume 12. Ti-Zr-B System. Investigation of Pseudo-Binary Systems ZrB2, -NbB2, ZrB2, TaB2, and HfB2 -NbB2
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OH
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The ternary system titanium-zirconium-boron was investigated from 1000C to 3245C, the melting temperature of zirconium diboride. The equilibria which exist have been determined except for the boron-rich equilibria which have been estimated. The following notable features were found minimum melting occurs in the titanium rich corner of the ternary a four-phase reaction involving Beta-metal phase, monoboride, diboride, and liquid occurs at a temperature slightly higher than theminimum melting zirconium exchanges with titanium in titanium monoboride to about 9 At. zirconium and the metal diborides form a continuos series of solid solutions. No ternary compounds were found. The techniques used in the investigation were X-ray analysis, melting point determination, and metallographic examination. Lattice parameter plots of the pseudo-binary systems ZrB2-NbB2, ZrB2-TaB2, and HfB2-NbB2 indicate that in each of these systems the diborides form a continuous series of solid solutions. Melting point temperatures for these systems have been determined.
- Inorganic Chemistry
- Metallurgy and Metallography