Effect of intermediate thermomechanical treatment on toughness of Al-Zn-Mg-Cu alloys

Mitsuo Niinomi, Toshiro Kobayashi, Hitoshi Hanyu

Research output: Contribution to journalArticlepeer-review


RI-ITMT method was applied to improve the toughness of Al-Zn-Mg-Cu alloys. This method is applicable most effectively to the Zr bearing Al-Zn-Mg-Cu alloys, but insufficiently to the Cr bearing alloys. Reduction of impurities Fe and Si is not so effective for toughening the alloys. The size of recrystallized grains in the alloys to which RI-ITMT method has been applied is extremely finer than that of the alloys to which a conventional method has been applied. A relationship lies between transgranular dimple fractured surface ratio and toughness, where transgranular dimple fractured surface expands with toughness. The ratio of this fracture surface type increases with fine transgranular precipitates, because they prevent the formation of rough slip bands in the grain.

Original languageEnglish
Pages (from-to)512-519
Number of pages8
Journaljournal of japan institute of light metals
Issue number9
Publication statusPublished - 1985


  • Al-Zn-Mg-Cu alloys
  • charpy test
  • fracture
  • intermediate thermomechanical treatment
  • toughness

ASJC Scopus subject areas

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


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