Crystallography of α Phase Precipitated on Dislocations and Deformation Twin Boundaries in a β Titanium Alloy

Tadashi Furuhara, Hideyuki Nakamori, Tadashi Maki

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

Crystallographic orientation relationships of α phases precipitated on dislocations and deformation twin boundaries in the β matrix have been investigated in a Ti–15V–3Cr–3Sn–3Al alloy, by means of transmission electron microscopy (TEM). Planar and widely spaced, {112}⟨111⟩β slip bands are formed by weak rolling at room temperature after being solutionized. By the subsequent aging at 933 K, α plates precipitate preferentially on the dislocations in the slip bands. In the same slip bands, α plates select particular variants of the Burgers orientation relationship. The selectivity of variants was discussed in terms of the effective relaxation of the transformation strain by the stress field associated with the dislocation. By subzero rolling at 77 K, {332}⟨113⟩β deformation twins are produced. By the subsequent aging at 933 K, α phases precipitate on the twin boundaries, holding the Burgers orientation relationships with respect to both of the β matrix and the twin. It is considered that the α nucleus forms coherently with both of the β phases to reduce the energy of the α/β interface newly formed.

Original languageEnglish
Pages (from-to)585-595
Number of pages11
JournalMaterials Transactions, JIM
Volume33
Issue number6
DOIs
Publication statusPublished - 1992 Jan 1
Externally publishedYes

Keywords

  • alpha phase
  • beta phase
  • crystallography
  • deformation twin
  • dislocation
  • heterogeneous nucleation
  • phase transformation
  • precipitation
  • strain
  • titanium alloy

ASJC Scopus subject areas

  • Engineering(all)

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