Ternary Phase Equilibria in Transition Metal-Boron-Carbon-Silicon Systems. Part 2: Ternary Systems. Volume 3: Zr-Ta-C System

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Abstract:

The ternary zirconium-tantalum- carbon system was investigated using X-ray, DTA, melting point, and metallographic techniques on chemically analyzed alloys; a complete phase diagram for temperatures above 1000 deg C was established. The system contains a high melting continuous solid solution of binary monocarbide phases; a moderate zirconium-tantalum exchange occurs in both the high and low temperature modifications of the subcarbide, Ta2C. Two four-phase reaction planes and two limiting tie-lines are present in the metal-rich portion of the ternary diagram. A minimum melting point occurs in the zirconium-rich portion of the ternary. The results of this investigation are described and discussed; selection of alloys for general high temperature applications is discussed in the light of the results of the Zr-Ta-C investigation. A brief thermodynamical evaluation of the system is given along with a calculated isothermal section at 1500 deg C.

Author(s):
Harmon, D. P. ; Brukl, C. E.
Author Organization(s):
AEROJET-GENERAL CORP SACRAMENTO CA
Funding Organization(s):
Air Force Materials Laboratory, Metals and Ceramics Division, Wright-Patterson AFB , OH
Document Type:
Technical Report/Technical Report
Publication Date:
1965 Nov 01
Pagination:
88

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution Code:
A - Approved For Public Release
Distribution Statement: Public Release

RECORD

Collection: TRECMS
Identifying Numbers
Report Number(s):
AFML-TR-65-2-Pt-2-Vol-3
Contract Number(s):
AF33(615)-1249
Task Number(s):
735001
Project Number(s):
7350
Subject Terms
Communities of Interest:
Air Platforms
Descriptor(s):
composite materials, materials laboratories, materials, heat energy, isotherms, transition temperature, phase diagrams, chemistry, crystal structure, low temperature, air force, chemical analysis, critical temperature, energy, equations, materials processing, materials science
Keyword(s):
TANTALUM CARBIDE, ZIRCONIUM CARBIDE, ZIRCONIUM HYDRIDE
Subject Categories:
Materials; Physics
Update Date:
2022 Aug 25