The mechanics of dynamic twinning in single crystal magnesium

Vignesh Kannan, Kavan Hazeli, K. T. Ramesh

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

In-situ ultra high speed optical imaging with 200 ns temporal resolution is used to gain insight into the evolution of twinning in single crystal magnesium under dynamic loading. Under compression along the a-axis, nucleation of twins is observed to occur on two conjugate {101¯2} twin planes. Twin nucleation appears to be stress-driven with the first twins nucleating at resolved stresses of 5–7 MPa. These first twins propagate across the specimen at very high speeds of the order 1 km/s. After the first twins stop growing, twin boundary growth is observed to be very small and relatively slow. The nucleation of additional twins from the boundaries of pre-existing twins is found to be preferred over twin boundary growth at these rates of loading. As a result, twin nucleation is found to have a dominant contribution to twin volume fraction evolution at later times. Lastly, twinning is found to have a dominant contribution to the net plastic strain at these strain rates.

Original languageEnglish (US)
Pages (from-to)154-178
Number of pages25
JournalJournal of the Mechanics and Physics of Solids
Volume120
DOIs
StatePublished - Nov 2018
Externally publishedYes

Keywords

  • Dynamics
  • High strain rate
  • In-situ high speed imaging
  • Magnesium
  • Twinning

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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