TERNARY PHASE EQUILIBRIA IN TRANSITION METAL-BORON-CARBON-SILICON SYSTEMS. PART 1. BINARY SYSTEMS. VOLUME 13. THE ZIRCONIUM-SILICON AND HAFNIUM-SILICON SYSTEMS

Abstract

The zirconium-silicon and hafnium-silicon binary systems were investigated by means of Debye-Scherrer X-ray analysis, metallography, melting points, differential analysis techniques, and chemical analysis. Both silicide systems contain a D8(8)-type phase which is stabilized by trace impurities of oxygen and nitrogen. The binary phases present are: Zr4Si, Zr2Si, Zr3Si2, Zr5Si4, alpha- and Beta-ZrSi, and ZrSi2; in the hafnium system: Hf2Si, Hf3Si2, Hf5Si4, and HfSi2. The ZrSi phase undergoes an allotropic transformation at 1550C; the high temperature form is of the CrB type while the low temperature crystal structure is of the FeB type. Complete phase diagrams from 1100C up to melting are given.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1968
Accession Number
AD0671550

Entities

People

  • C. E. Brukl

Organizations

  • Aerojet Rocketdyne Holdings

Tags

DTIC Thesaurus Topics

  • Alloys
  • Arc Melting
  • Chemical Analysis
  • Chemistry
  • Crystal Structure
  • Differential Thermal Analysis
  • Films
  • Heat Energy
  • High Temperature
  • Isotherms
  • Materials
  • Materials Laboratories
  • Measurement
  • Phase Diagrams
  • Powder Metals
  • Solid Solutions
  • Transition Metals

Fields of Study

  • Materials science
  • Physics

Readers

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