Discontinuous yielding and microstructural evolution of Ti-40 at.% Al alloy compressed in single α-hcp phase region

Dai Xiu Wei, Yuichiro Koizumi, Akihiko Chiba

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We examined the hot deformation behaviors of Ti-40 at.% Al alloy via hot compression tests at temperatures in the range of 1423–1523 K (single α-hcp phase) at strain rates in the range of 1–0.001 s−1. Specifically, we investigated the discontinuous yielding phenomenon and the strain rate dependence of the microstructural evolution of the alloy. Sharp drops in flow stresses occurred during hot compression at strain rates of 1 s−1 and 0.1 s−1, which were attributed mainly to both the multiplication of dislocations and the formation of deformation twins. The twins were determined as being of the compound type with the following twin elements: K1: {112¯1}, K2: {112¯2¯}, η1: <112¯6¯>, η2: <112¯3>, s = 0.232. The grains of the α2-Ti3Al single phase were more significantly refined and homogenized by hot compression at a high strain rate of 1 s−1 than at a low strain rate of 0.001 s−1, with the assistance of the deformation twins at the high strain rate.

Original languageEnglish
Pages (from-to)1261-1276
Number of pages16
JournalJournal of Alloys and Compounds
Volume693
DOIs
Publication statusPublished - 2017 Feb 5

Keywords

  • Discontinuous yielding
  • Hot deformation
  • Titanium aluminides
  • Twinning

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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