Strength and Toughness of Tailored Ceramic Microstructures

Abstract

AFOSR project 87-0396 was undertaken to develop a detailed understanding of the link between microstructural variables and the strength and toughness of ceramic materials. A major emphasis of this effort has been developing approaches for producing multiphase ceramic microstructures with enhanced reliability i.e. elevated temperature microstructural stability and damage tolerance and/or room temperature flaw tolerance. Improvements in elevated temperature damage tolerance depend upon having a dual phase interconnected microstructure with more than 16 volume percent second phase. Our findings show that adding cubic zirconia to alumina improves damage tolerance in the that A1203 with 50% cZr02 (AZ50) shows the same hardness yet appreciably less indentation damage than alumina at 1200 C and is very resistant to grain coarsening for up to 100 hours at 1650 C. Also, A1203 with 50% YAG (AY50) has twice the hardness of A1203 at 1200 C.

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Document Details

Document Type
Technical Report
Publication Date
Dec 30, 1990
Accession Number
ADA232911

Entities

People

  • C. J. Russo
  • Gary A. Miller
  • Helen M. Chan
  • J. D. French
  • M. P. Harmer

Organizations

  • Lehigh University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Ceramic Materials
  • Ceramic Matrix Composites
  • Composite Materials
  • Elastic Properties
  • Electron Microscopes
  • Electron Microscopy
  • Grain Size
  • Material Degradation Processes
  • Materials
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Modulus Of Elasticity

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Powder metallurgy of Titanium alloys.
  • Systems Analysis and Design