Deformation and fracture behavior of TiAl in compression tests at room temperature

Katsuhiko Nonaka, Kazuo Tanosaki, Masayoshi Fujita, Akihiko Chiba, Takeshi Kawabata, Osamu Izumi

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

In order to investigate the deformation and fracture behavior of a Ti-50 mol%Al alloy, discontinuous compression tests have been performed at room temperature. Surfaces of specimens were observed by optical microscopy and scanning electron microscopy (SEM) to reveal the formation of deformation bands, initiation sites and propagating routes of cracks, and fracturing process at every a few per cent of plastic stain by interrupting the tests. The compressive plastic strain at crack initiation is 2-3% which is nearly twice as large as the tensile fracture strain reported in the other studies. From the observation of structural changes with cumulative strain the modes of initiation and propagation of cracks are classified. The interfaces of the α2 phase which is present in equiaxed γ phase grains, in grains with a lamellar structure and on grain boundaries, give an initiation site for cracking at the early stage of deformation while the α2 phase itself acts as an obstruction against crack propagation by necking and kinking on crack propagation routes.

Original languageEnglish
Pages (from-to)802-810
Number of pages9
JournalMaterials Transactions, JIM
Volume33
Issue number9
DOIs
Publication statusPublished - 1992 Jan 1
Externally publishedYes

Keywords

  • compression test
  • crack initiation
  • crack propagation
  • deformation bands
  • deformation behavior
  • intermetallic compound
  • lamellar structure
  • microstructures
  • titanium-aluminum
  • twins

ASJC Scopus subject areas

  • Engineering(all)

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