A Study in the Interfacial Stability of Ti/Al2O3, Ti3Al/Al2O3 and TiAl/Al2O3 Composite Materials

Abstract

This thesis is a study of the interfacial stability of the Ti-Base metal matrix composites Ti/Al2O3, Ti3Al/Al2O3 and TiAl/Al2O3. Interfacial stability is discussed in view of the importance of thermodynamics and kinetics as the primary considerations which govern the type of stability observed. From a thermodynamics approach, the application of phase equilibrium diagrams is essential in the design of composite systems. A classification system, with reference to phase equilibrium, is used to describe the type of interfacial stability observed for the composites studied. In addition, electron-probe microanalysis, atom-probe field ion microscopy and X-ray diffraction results are used to establish Ti-Al-O phase relations for the temperature range 900-to-1250 deg C. The kinetics of interfacial stability is discussed with particular attention given to the kinetic considerations; diffusion path, phase formation sequence, steady-state layer growth and interface morphology. Kinetic results in the form of parabolic growth constants and calculated interdiffusion coefficients are presented.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1995
Accession Number
ADA334772

Entities

People

  • Joel A. Dekock

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Chemical Kinetics
  • Chemical Stability
  • Chemistry
  • Composite Materials
  • Crystal Structure
  • Diffraction
  • Field Ion Microscopy
  • Grain Boundaries
  • Heat Treatment
  • Materials
  • Materials Processing
  • Materials Science
  • Materials Testing
  • Measurement
  • Metal Matrix Composites
  • Phase Diagrams
  • Solid Solutions

Fields of Study

  • Materials science

Readers

  • Control Systems Engineering.
  • Powder metallurgy of Titanium alloys.

Technology Areas

  • Microelectronics