Ultrahigh strength and high plasticity in TiAl intermetallics with bimodal grain structure and nanotwins

Kaveh Edalati, Shoichi Toh, Hideaki Iwaoka, Masashi Watanabe, Zenji Horita, Daisuke Kashioka, Kyosuke Kishida, Haruyuki Inui

Research output: Contribution to journalArticlepeer-review

78 Citations (Scopus)

Abstract

Nanostructured intermetallics generally exhibit high strength but limited plasticity due to the covalent nature of their bonding. In this study, high-pressure torsion followed by annealing was used to produce TiAl intermetallics with two microstructural features: (i) bimodal microstructure composed of nanograins and submicrometer grains; and (ii) nanotwins. An exceptional performance, combining ultrahigh yield strength, ∼2.9 GPa, and high strain to failure, ∼14%, was achieved with micropillar compression tests. Twinning, dislocation slip and grain boundary sliding appear to be active under compressive stress.

Original languageEnglish
Pages (from-to)814-817
Number of pages4
JournalScripta Materialia
Volume67
Issue number10
DOIs
Publication statusPublished - Nov 2012

All Science Journal Classification (ASJC) codes

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

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