Grain growth in nanograined aluminum oxide by high-pressure torsion: Phase transformation and plastic strain effects

Ikuro Fujita, Kaveh Edalati, Xavier Sauvage, Zenji Horita

Research output: Contribution to journalArticle

9 Citations (Scopus)


Application of severe plastic deformation (SPD) to different materials usually leads to significant grain refinement and accelerated phase transformations. This study reports the occurrence of grain growth in nanocrystalline Al2O3 by SPD processing via high-pressure torsion (HPT) due to a phase transformation from γ with the cubic structure to α with the rhombohedral structure. This transformation was significantly enhanced by pressure and plastic strain and occurred at ~650 K below the γ → α transition temperature. The γ phase after HPT processing could be detected only in nanograins or in the nano-sized laths with the (13¯1)γ//(014¯)α and [001]γ//[100]α coherent orientation relationship.

Original languageEnglish
Pages (from-to)11-14
Number of pages4
JournalScripta Materialia
Publication statusPublished - Jul 15 2018


All Science Journal Classification (ASJC) codes

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

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