Mechanical properties of Al—Si and Al—Fe powder metallurgy alloys

Mitsuo Niinomi, Toshiro Kobayashi, Shinji Hakata

Research output: Contribution to journalArticlepeer-review


The relationship between mechanical properties and microstructure, and the mechanism of strengthening of Al—18 wt%Si and Al—8 wt%Fe alloys made by powder metallurgy process were investigate. Si particles are observed in the Al—18 wt% Si alloys, and Al3Fe and Al6Fe particles are observed as intermetallic compounds in the Al—8 wt%Fe alloys using an transmission electron microscopy. Work hardening mechanism of the alloys is summarized as follows: Firstly dislocation loops are formed around fine dispersion particles. Then, many dislocation such as like prismatic loops pile up as deformation progresses. Finally, stress concentration induced by dislocation loops is subjected to the plastic release. The strength of those alloys are related closely to both the volume fraction of particles and the particle size.

Original languageEnglish
Pages (from-to)772-777
Number of pages6
Journaljournal of japan institute of light metals
Issue number11
Publication statusPublished - 1991


  • P/M alloy
  • dispersion strengthening
  • mechanical property
  • mechanism of strengthening
  • microstructure

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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