{112} {111} Twinning during ω to body-centered cubic transition

S. Q. Wu, D. H. Ping, Y. Yamabe-Mitarai, W. L. Xiao, Y. Yang, Q. M. Hu, G. P. Li, R. Yang

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

We propose an x-lattice mechanism that is irrelevant to dislocation behaviors for a popular twinning ({112} {111}-type) system in body-centered-cubic (bcc) metals and alloys. The twinning process is dependent on the reverse transformation of ω (hexagonal) → bcc. The driving force of the twinning is attributed to the instability of a high density of nanoscale metastable ω precursors, and the mechanism has been experimentally and theoretically confirmed in bcc-Ti alloys with the {112} {111}-type twin formed under conditions free of external stress and internal strain. The ω-lattice mechanism involves bcc lattice shuffling only, thus can be applied to all bcc metals and alloys.

Original languageEnglish
Pages (from-to)122-128
Number of pages7
JournalActa Materialia
Volume62
Issue number1
DOIs
Publication statusPublished - 2014 Jan
Externally publishedYes

Keywords

  • First-principles calculation
  • Metals and alloys
  • Microstructure
  • Titanium alloy
  • Twin

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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