Accession Number:

ADA470384

Title:

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

Descriptive Note:

Documentary rept.

Corporate Author:

AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OH

Personal Author(s):

Report Date:

1966-10-01

Pagination or Media Count:

61.0

Abstract:

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.

Subject Categories:

  • Inorganic Chemistry
  • Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE