Design of Interfaces in Metal Matrix Composites

Abstract

The main goal of this research was to optimize the interface properties in metal matrix composites by lattice matching the matrix and the dispersoids. Stable, coherent dispersoids can be achieved by mechanically alloying lattice-matched dispersoids into metal matrices and allowing some recrystallization or coarsening to occur, or by internal nitridization or carburization of homogeneous alloys. A model system that has a high probability of forming coherent interfaces is ZrN in Nb. For comparison purposed the relatively poorly matched systems TiN in Nb and TiN in Cu were also studies. The matrix/dispersoid orientation relationship in the Nb/ZrN system has been found to be (011)Nb,Zr (parallel) (001)ZrN. In the Nb/TiN system, the presence of an orientation relationship after extensive nitriding could not be detected. In the Cu/TiN system only external nitridation occurred when bulk Cu-Ti alloys were employed. However uniformly distributed nanosized TiN dispersoids were obtained when alloyed Cu-Ti powders were nitrided and subsequently mechanically alloyed.

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Document Details

Document Type
Technical Report
Publication Date
Feb 15, 1993
Accession Number
ADA262052

Entities

People

  • Harris L. Marcus
  • Zwy Eliezer

Organizations

  • University of Texas at Austin

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Composite Materials
  • Copper
  • Crystal Lattices
  • Crystal Structure
  • Diagrams
  • Electron Microscopy
  • Fabrication
  • Materials
  • Materials Processing
  • Materials Science
  • Materials Testing
  • Mechanical Working
  • Metal Matrix Composites
  • Microscopy
  • Particles
  • Residual Stress
  • Solid Solutions

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.