Ternary Phase Equilibria in Transition Metal-Boron-Carbon-Silicon Systems. Part 2. Ternary Systems. Volume 4. The TI-ZR-C, TI-HF-C, AND ZR-HF-C Systems
Abstract
Solid-state sections of the ternary Ti-Zr-C and Ti-Hf-C systems were investigated; the complete Zr-Hf-C system was studied from 1600 C to melting using X-ray, DTA, melting point, and metallographic techniques on chemically analyzed alloys; a complete phase diagram for the Zr-Hf-C system for temperatures above 1600 C was established. The hafnium metal used contained 4 At. percent zirconium. The Ti-Zr-C system contains a miscibility gap in the monocarbide region; the miscibility gap is completely closed at temperatures above approximately 2150 C. A miscibility gap is also present in the Ti-Hf-C system in the monocarbide region; complete solid solubility exists between the binary monocarbides at temperatures above approximately 2050 C. The Zr-Hf-C system contains a high melting, continuous monocarbide solid-solution in a carbon defect lattice. The a-hafnium phase is stabilized toward higher temperatures by carbon; this phase shows a moderate solubility for carbon and zirconium. One four-phase reaction plane is present in the metal-rich portion of the ternary diagram. The results of these investigations are described and discussed; application possibilities are briefly mentioned.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1966
- Accession Number
- AD0480801
Entities
People
- C. E. Brukl
- David P. Harmon
Organizations
- Aerojet Rocketdyne Holdings