Accession Number : AD0803913

Title :   TERNARY PHASE EQUILIBRIUM IN TRANSITION METAL-BORON-CARBON-SILICON SYSTEMS. PART 2. TERNARY SYSTEMS. VOLUME 7. TI-ZR-B SYSTEM. INVESTIGATION OF PSEUDO-BINARY SYSTEMS ZRB2-NBB2, ZRB2-TAB2, AND HFB2-NBN2

Descriptive Note : Technical rept.

Corporate Author : AEROJET-GENERAL CORP SACRAMENTO CA MATERIALS RESEARCH LAB

Personal Author(s) : Eckert, T E

PDF Url : AD0803913

Report Date : Oct 1966

Pagination or Media Count : 62

Abstract : The ternary system titanium-zirconium-boron was investigated from 1000 C to 3245 C, 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 the minimum melting; zirconium exchanges with titanium in titanium monoboride to about 9 At.% zirconium; and the metal diborides form a continuous 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.

Descriptors :   *BORIDES, *PHASE STUDIES, *TITANIUM ALLOYS, *ZIRCONIUM ALLOYS, ARC MELTING, CORROSION RESISTANCE, HARDNESS, HEAT TREATMENT, HIGH TEMPERATURE, IMPURITIES, MELTING POINT, METALLOGRAPHY, MICROSTRUCTURE, POWDER METALS, THERMAL SHOCK, TRANSITION METALS, X RAYS

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE