Mechanical properties and Portevin-Le Chatelier effect in Al-Si alloy

Toshiro Kobayashi, Mitsuo Niinomi, Koichi Ikeda

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


P-L effect in high silicon aluminum alloys has been investigated along with the mechanical properties. Solution treatment increased elongation of these alloys, without decrease in strength. P-L effect in high silicon aluminum alloys was first found in this study. This P-L effect is of A type and considered to be caused by the interaction between solute atoms of silicon and dislocations. The activation energies for the P-L effect were determined to be 35.5-92.5 kj/mol. These values are in agreement with those reported in other aluminum alloys. Values of (m~β) were determined to be 2~3, where m and βare the strain exponents of vacancy concentration and mobile dislocation density, respectively. These values are near those obtained in other fcc metals. β is less than 1, and m is larger than β, suggesting that vacancy concentration could govern the P-L effect.

Original languageEnglish
Pages (from-to)555-561
Number of pages7
Journaljournal of japan institute of light metals
Issue number9
Publication statusPublished - 1986


  • Al-Si alloy
  • P-L effect
  • Si solute
  • dislocation
  • mechanical properties

ASJC Scopus subject areas

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


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