Accession Number : AD0803914


Title :   TERNARY PHASE EQUILIBRIA IN TRANSITION METAL-BORON-CARBON-SILICON SYSTEMS. PART 4. THERMOCHEMICAL CALCULATIONS, VOLUME 3. COMPUTATIONAL APPROACH TO THE CALCULATION OF TERNARY PHASE DIAGRAMS


Descriptive Note : Technical rept.


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


Personal Author(s) : Chang, Y A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/803914.pdf


Report Date : Oct 1966


Pagination or Media Count : 81


Abstract : The general conditional equations which govern the phase equilibria in three-component systems are presented. Using the general conditional equations, a general method has been developed to precalculate the phase equilibria in three-component systems from first principle using computer technique. The method developed has been applied to several model examples and the system Ta-Hf-C. The phase equilibria in three-component systems calculated using the simplified method as originally developed by Rudy, agree well with those calculated by the present method. The only difference is in the homogeneous range with respect to the interstitial component of solid solutions which exhibit large variation with metal exchange. This is to be expected in view of the assumptions made in the simplified method.


Descriptors :   *COMPUTER PROGRAMS , *TRANSITION METALS , *PHASE STUDIES , *SILICON , *CARBON , *THERMODYNAMICS , *THERMOCHEMISTRY , *BORON , TEMPERATURE , FREE ENERGY , SOLID SOLUTIONS , ATOMS , HAFNIUM , EQUATIONS , TANTALUM , DECOMPOSITION , PREDICTIONS , STABILITY


Subject Categories : Properties of Metals and Alloys


Distribution Statement : APPROVED FOR PUBLIC RELEASE