Niobium Silicides for High Temperature Applications

Abstract

The processing and properties of advanced intermetallics based on aluminide and silicide matrices have been investigated. Vacuum hot press techniques were utilized to produce both monolithic and composite Ni3Al, NiAl, and Nb5Si3. The effects of 10 volume percent TiB2 particulate's3 on the fracture toughness of Ni 3 Al and NiAl were determined while in-situ monitoring of the fracture toughness tests was conducted with the aid of a deformation stage mounted inside a scanning electron microscope. The Nb5si3 powders were produced via reaction synthesis followed by hot press consolidation and evaluation of fracture toughness on both the monolithic silicide as well as in-situ Nb5Si3 /Nb composites. The Nb particles imparted significant toughening while both crack bridging and ductile phase toughening were observed in the in-situ fracture studies. Significant effects of loading rate on the resulting toughness was observed.

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Document Details

Document Type
Technical Report
Publication Date
Jan 25, 1993
Accession Number
ADA262334

Entities

People

  • John J. Lewandowski

Organizations

  • Case Western Reserve University

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Chemistry
  • Composite Materials
  • Crystal Structure
  • Electron Microscopes
  • Electron Microscopy
  • Material Degradation Processes
  • Materials
  • Materials Engineering
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Particle Size
  • Solid Solutions

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.

Technology Areas

  • Microelectronics