Accession Number : AD0489140

Title :   TERNARY PHASE EQUILIBRIA IN TRANSITION METAL-BORON-CARBON-SILICON SYSTEMS. PART II. TERNARY SYSTEMS. VOLUME IX. ZR-W-B SYSTEM AND THE PSEUDOBINARY SYSTEM TAB2-HFB2.

Descriptive Note : Technical rept.,

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

Personal Author(s) : Chang, Y. A.

Report Date : FEB 1966

Pagination or Media Count : 26

Abstract : The solid state phase equilibria of the system Zr-W-B at 1400 C and the phase equilibria in the melting range for the four pseudobinary systems: ZrB2-W2B5-ZrB2-WB, ZrB2-W2B and ZrB2-W have been investigated using X-ray technique, melting point determinations and metallographic examinations. At 1400 C, the intermetallic phase ZrW2 and the four tungsten-boron intermediate phases were found to be in equilibrium with ZrB2. Two ternary phases, one possibly stable only at high temperatures, were indicated to exist in this system. The pseudobinary system, TaB2-HfB2 forms a series of continuous solid solutions. The melting points increase smoothly from pure TaB2 to HfB2. (Author)

Descriptors :   *PHASE STUDIES), *HAFNIUM COMPOUNDS), (*TRANSITION METALS, (*TANTALUM COMPOUNDS, BORIDES), (*BORIDES, SOLID SOLUTIONS, INTERMETALLIC COMPOUNDS, ZIRCONIUM COMPOUNDS, TUNGSTEN COMPOUNDS, CRYSTAL LATTICES, X RAY DIFFRACTION, EUTECTICS, ZIRCONIUM ALLOYS, TUNGSTEN ALLOYS, BORON ALLOYS, PHOTOMICROGRAPHY, MELTING POINT.

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE