PHASE EQUILIBRIA INVESTIGATION OF BINARY, TERNARY, AND HIGHER ORDER SYSTEMS. PART 1. THE PHASE DIAGRAMS OF THE SYSTEMS Ti-Nb-C, Ti-Ta-C, AND Ti-Mo-C

Abstract

The ternary alloy systems Ti-Nb-C, Ti-Ta-C, and Ti-Mo-C were investigated by means of X-ray, melting point, DTA, and metallographic techniques and phase diagrams for all three systems from 1500C through the melting range were established. The solid state phase relationships in all three systems are similar. The cubic monocarbides are completely miscible, whereas the subcarbides, Nb(Ta,Mo)C2 show limited solubility and are terminated by three-phase equilibria Me + Me2C + MeC1-x in the ternary. The sublattice order- disorder transition in the subcarbides are lowered by titanium substitutions. The monocarbide solutions in all three systems show a regular melting behavior. The phase relationships of the three systems are discussed and the differences in particular equilibria related to the thermodynamic properties of the phases in the boundary systems.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1970
Accession Number
AD0713153

Entities

People

  • E. Rudy

Organizations

  • Aerojet Rocketdyne Holdings

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Alloys
  • Ceramic Materials
  • Critical Temperature
  • Differential Thermal Analysis
  • Heat Energy
  • Isotherms
  • Materials
  • Materials Laboratories
  • Melting Point
  • Phase Diagrams
  • Phase Transformations
  • Solid Solutions
  • Thermal Analysis
  • Thermodynamic Properties
  • Thermodynamics
  • Transition Temperature
  • X Rays

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  • Materials Science and Engineering.