Strengthening of NiAl Matrix Composites

Abstract

Deformation of titanium boride/nickel aluminum composites at high temperatures exhibit low temperature deformation characteristics, and grain size refinement in these composites could account for the strengthening of the composites. Interfaces of TiB2-NiA1 and alpha--aluminum oxides--NiAR in TiB2/ NiA1 composites have been investigated by analytical electron microscopy. Although no consistent crystallographic orientation relationships have been found between NiA1 and TiB2 or A12O3, semicoherent interfaces between alpha- A12O3 and NiA1 have been observed in areas where the low indexed crystallographic planes of alpha-A12O3 aligned with that of NiA1. No semicoherent interfaces between NiA1 and TiB2 have been observed. Silicon segregation was consistently detected by at the TiB2/NiA1 interface region. Segregation has not been detected in the alpha-A12O3-NiA1 interface region. The segregation layer observed at the TiB2-NiA1 interface is too thin to absorb any of the thermal residual stress.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1991
Accession Number
ADA242236

Entities

People

  • Richard J. Arsenault

Organizations

  • University of Maryland

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms

DTIC Thesaurus Topics

  • Ceramic Materials
  • Composite Materials
  • Electron Microscopy
  • Finite Element Analysis
  • Materials
  • Materials Laboratories
  • Materials Science
  • Materials Testing
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Microscopy
  • Modulus Of Elasticity
  • Stress Strain Relations
  • Stresses
  • Two Dimensional
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Neurodegenerative Parkinson's Disease and Rickettsial Disease handbook, including the data level of dopamine, BC, neurons, and PD.
  • Powder metallurgy of Titanium alloys.
  • Thin Film Deposition Science.

Technology Areas

  • Microelectronics