Evolution of twinning systems and variants during sequential twinning in cryo-rolled titanium

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

22 Scopus Citations
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Author(s)

  • Z. W. Huang
  • S. B. Jin
  • H. Zhou
  • Y. S. Li
  • Y. Cao

Detail(s)

Original languageEnglish
Pages (from-to)52-67
Journal / PublicationInternational Journal of Plasticity
Volume112
Online published18 Aug 2018
Publication statusPublished - Jan 2019
Externally publishedYes

Abstract

On the basis of the order in which twinning occurs, twins are termed primary, secondary, and tertiary. In HCP materials, compression twins (CT) and extension twins (ET) are observed to form alternatively during sequential twinning. However, selections of twinning systems and variants are not yet fully understood. Both ET→CT→ET and CT→ET→CT sequences have been reported in literatures. Here we conduct a systematic and statistical study on the evolutions of twinning sequences and variants during cryogenic rolling of Ti. Both twinning sequences are observed in the same sample. Current statistical results indicate the selections of the twinning sequence and variants are governed by the following criteria: (1) the twinning sequence in an individual grain depends on its initial orientation; (2) the twin variant selection is mainly governed by the Schmid's law, although a few non-Schmid twins are observed along the short axis of the parent grains. These criteria are thought applicable to other HCP metallic materials.

Research Area(s)

  • Compression twin, Schmid factor, Tension twin, Titanium, Twinning sequence