Twinning in magnesium under dynamic loading

Neha Dixit, Kavan Hazeli, Kaliat T. Ramesh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

Twinning is an important mode of deformation in magnesium (Mg) and its alloys at high strain rates. Twinning in this material leads to important effects such as mechanical anisotropy, texture evolution, tension-compression asymmetry, and sometimes non-Schmid effects. Extension twins in Mg can accommodate significant plastic deformation as they grow, and thus twinning affects the overall rate of plastic deformation. We use an experimental approach to study the deformation twinning mechanism under dynamic loading. We perform normal plate impact recovery experiments (with microsecond pulse durations) on pure polycrystalline Mg specimens. Estimates of average TB velocity under the known impact stress are obtained by characterization of twin sizes and aspect ratios developed within the target during the loading pulse. The measured average TB velocities in our experiments are of the order of several m s-1. These velocities are several orders of magnitude higher than those so far measured in Mg under quasi-static loading conditions. Electron back-scattered diffraction (EBSD) is then used to characterize the nature of the twins and the microstructural evolution. Detailed crystallographic analysis of the twins enables us to understand twin nucleation and growth of twin variants under dynamic loading.

Original languageEnglish (US)
Title of host publicationDYMAT 2015 - 11th International Conference on the Mechanical and Physical Behaviour of Materials Under Dynamic Loading
EditorsEzio Cadoni
PublisherEDP Sciences
ISBN (Electronic)9782759818174
DOIs
StatePublished - Sep 7 2015
Externally publishedYes
Event11th International Conference on the Mechanical and Physical Behaviour of Materials Under Dynamic Loading, DYMAT 2015 - Lugano, Switzerland
Duration: Sep 7 2015Sep 11 2015

Publication series

NameEPJ Web of Conferences
Volume94
ISSN (Print)2101-6275
ISSN (Electronic)2100-014X

Conference

Conference11th International Conference on the Mechanical and Physical Behaviour of Materials Under Dynamic Loading, DYMAT 2015
Country/TerritorySwitzerland
CityLugano
Period9/7/159/11/15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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