Role of defects on microstructure development of beta titanium alloys

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32 Citations (Scopus)

Abstract

Microstructures of α precipitation from a deformed β matrix by thermomechanical processing were studied in a representative β titanium alloy, i.e. Ti-15V-3Cr-3Sn-3Al alloy. In the aged specimens, after solution treatment, the grain boundary is the most preferential nucleation site in the α precipitation. Localized slip occurs in the β matrix by cold rolling after solution treatment whereas {332}<113> deformation twins are formed by subzero rolling at 77 K. After subsequent aging of the rolled specimens, the α phase preferentially forms on those defects in the β matrix with a low energy orientation relationship (Burgers relationship). There is strong variant restriction in heterogeneous nucleation on such defects. Controlled short time annealing above the β transus (β recovery treatment) after cold rolling produces the fine β subgrain. By subsequent aging, α precipitates form preferentially on β subgrain boundaries and also within β subgrains. A great number of α variants are observed locally in the recovered and aged specimens than those in the cold rolled and aged specimens. β recovery treatment prior to aging improves the strength-ductility balance mostly because of the increase of local elongation.

Original languageEnglish
Pages (from-to)221-224
Number of pages4
JournalMetals and Materials International
Volume6
Issue number3
DOIs
Publication statusPublished - 2000 Jun
Externally publishedYes

Keywords

  • Crystallography
  • Microstructure
  • Precipitation
  • Strength
  • Titanium alloy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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