Metal Matrix Composite: Strengthening Mechanisms

Abstract

All of the existing strengthening mechanisms that have been proposed to explain the increase in strength of discontinuous reinforcement composites are based on the assumption that the reinforcement does not perform. However, it appears that TiB2 deforms at high temperature within the NiA1 matrix. It has also been observed that there is no apparent dislocation generation due to the difference in coefficient of thermal expansion between TiB2 and NiAl. A finite element investigation has demonstrated how and why the deformation is localized in discontinuous reinforced composites. The addition of discontinuous SiC to Al alloys can result in a five-fold increase in the yield stress and this increase in strength is readily accounted for by changes in the matrix strength. Keywords: Metal matrix composites; Titanium; Nickel; Aluminum; TiB2/NiAl. (kt)

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1989
Accession Number
ADA214843

Entities

People

  • Richard J. Arsenault

Organizations

  • University of Maryland

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Ceramic Materials
  • Composite Materials
  • Creep
  • Crystal Structure
  • Electron Microscopes
  • Electron Microscopy
  • Finite Element Analysis
  • High Temperature
  • Materials
  • Materials Laboratories
  • Materials Science
  • Materials Testing
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Stress Strain Relations
  • Test Methods

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.