Strain-assisted formation of nano-scaled lamellar structure in Ti-39at%AI single crystals

Yuchiro Koizumi, Takayuki Tanaka, Fujita Takeshi, Minamino Yoritoshi

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

We have studied the effects of straining prior to annealing for lamellar structure formation in a Ti-39at%Al single crystal intending to accelerate the lamellar structure formation and decrease the resultant lamellar spacing via preferential nucleation of γ-TiAl phase at dislocations in α2-Ti 3A phase. In a crystal cold-rolled to 10% reduction before annealing, a fine lamellar structure with 88 nm average spacing was formed by annealing at 1073 K for 1 x 10 4 whereas no lamella were observed in the crystal subjected to the same annealing after 5%-cold-rolling. In addition, it was also demonstrated that when the crystal is locally strained by indentation and annealed at 1073 K for 1 xlO 4 s, a lamellar structure with 43 nm average lamellar spacing is formed in areas near the indentation and there were no lamella beyond these areas.

Original languageEnglish
Pages (from-to)131-136
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Volume1059
Publication statusPublished - 2008 Dec 1
EventNanoscale Pattern Formation - Boston, MA, United States
Duration: 2007 Nov 262007 Nov 30

ASJC Scopus subject areas

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

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