Mechanical properties and microstructure of cast oxide-dispersion-strengthened aluminum

A. M. Redsten*, E. M. Klier, A. M. Brown, D. C. Dunand

*Corresponding author for this work

Research output: Contribution to journalArticle

63 Scopus citations

Abstract

Oxide-dispersion-strengthened aluminum containing 25 vol.%, 0.28 μm, alumina dispersoids was fabricated by pressure infiltration. The mechanical properties at room and elevated temperature are presented for both as-cast, coarse-grained materials and extruded, fine-grained materials. Although the room temperature yield strength is low (about 60 MPa), the 0.2% proof stress and ultimate tensile stress are much higher (about 200 MPa and 330 MPa respectively) as a result of the very high strain hardening rate. However, the initially high strain hardening rate decreases with strain. This behavior is explained by extending a model by Ashby for dilute dispersion-strengthened metals to the case of a matrix containing a large volume fraction of large particles, whereby the interaction of primary glide dislocations with secondary loops punched by dispersoids is considered.

Original languageEnglish (US)
Pages (from-to)88-102
Number of pages15
JournalMaterials Science and Engineering A
Volume201
Issue number1-2
DOIs
StatePublished - Oct 1995

Keywords

  • Aluminum
  • Dispersion strengthening
  • Mechanical properties
  • Microstructure

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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