Accession Number : AD0470827


Title :   TERNARY PHASE EQUILIBRIA IN TRANSITION METAL-BORON-CARBON-SILICON SYSTEMS. PART 2. TERNARY SYSTEMS. VOL. 1. TA-HF-C SYSTEM


Descriptive Note : Technical rept.


Corporate Author : AEROJET-GENERAL CORP SACRAMENTO CA


Personal Author(s) : Rudy, E


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/470827.pdf


Report Date : Sep 1965


Pagination or Media Count : 100


Abstract : The ternary alloy system tantalum-hafnium-carbon was investigated by means of X-ray, DTA, melting point, and metallographic techniques on chemically analyzed alloys, and a complete phase diagram for temperature above 1000 deg C was established. The system is characterized by a very high melting solid solution of the refractory monocarbides in both binary systems, and a limited exchange of hafnium in the low- and high-temperature modification of Ta2C. Four Class II four-phase reaction planes as well as three limiting tie lines occur in the concentration area metal-monocarbide solution. The results of this investigation are discussed and compared with previous, partial investigations of this system. Fields of application are outlined.


Descriptors :   *TRANSITION METALS , *CARBIDES , *PHASE STUDIES , HAFNIUM COMPOUNDS , HIGH TEMPERATURE , CRYSTAL LATTICES , X RAY DIFFRACTION , CARBON , IMPURITIES , QUENCHING , HEAT TREATMENT , MELTING , HEAT , CHEMICAL ANALYSIS , SILVER , METALLOGRAPHY , CARBON ALLOYS , HAFNIUM ALLOYS , TANTALUM ALLOYS , TANTALUM CARBIDES


Subject Categories : Ceramics, Refractories and Glass


Distribution Statement : APPROVED FOR PUBLIC RELEASE