Microstructural Development In a Spray Formed Aluminum-Silicon Carbide Based Metal Matrix Composite

Abstract

The aging response of an 8090-SiC composite at 190 deg C has been monitored using microhardness tests, microhardness tests and transmission electron microscopy(TEM). Intriguingly, it has been found that the composite does not exhibit increased aging kinetics when compared with a control 8090 alloy. Both the control alloy and the composite exhibit a two stage strengthening behavior which is attributed to the precipitation of Delta' (Al3Li) and S' (Al2CuMg). Quantitative microscopy of the composite has been initiated since it has been found that T2 (Al6CuLi3), precipitates on the SiC/matrix interface. Hence, the interfacial area per unit volume(Sv) is of the utmost importance. Finally, the effects of T2 precipitates, at the SiC/matrix interface, on the distribution of Delta' have been determined.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1992
Accession Number
ADA259414

Entities

People

  • Paul R. Howell

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Air Platforms
  • Space

DTIC Thesaurus Topics

  • Aluminum
  • Aluminum Alloys
  • Chemistry
  • Composite Materials
  • Crystal Structure
  • Electron Microscopy
  • Hardness
  • Materials
  • Materials Engineering
  • Materials Science
  • Mechanical Properties
  • Microhardness
  • Microscopy
  • Particles
  • Precipitation
  • Silicon Carbide
  • Transmission Electron Microscopy

Fields of Study

  • Materials science

Readers

  • Mathematics or Statistics
  • Powder metallurgy of Titanium alloys.

Technology Areas

  • Microelectronics