Twin boundary migration creating zero shear strain: In-situ TEM observations and atomistic simulations

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Abstract

Atomistic simulations were conducted to study the migration of {1012} 〈1011〉 twin boundary. A bi-crystal that satisfies the twin orientation relationship was constructed and a tensile strain was applied in parallel to the 〈c〉 axis of one crystal. Under the tensile strain, the twin boundary starts to migrate but the migration (twin growth) does not produce any observable shear strain on the bi-crystal. In-situ transmission electron microscopy (TEM) observations of a single crystal Mg under tension and compression confirm that during twinning and detwinning, no shear strain is produced. The specimen uniformly elongates and narrows during twinning, and widens across the width during detwinning.

Original languageEnglish
Title of host publicationMagnesium Technology 2013 - Held During the TMS 2013 Annual Meeting and Exhibition
PublisherMinerals, Metals and Materials Society
Pages107-111
Number of pages5
ISBN (Print)9781118605523
DOIs
StatePublished - 2013
EventMagnesium Technology 2013 - TMS 2013 Annual Meeting and Exhibition - San Antonio, TX, United States
Duration: 3 Mar 20137 Mar 2013

Publication series

NameMagnesium Technology
ISSN (Print)1545-4150

Conference

ConferenceMagnesium Technology 2013 - TMS 2013 Annual Meeting and Exhibition
Country/TerritoryUnited States
CitySan Antonio, TX
Period3/03/137/03/13

Keywords

  • Atomistic simulation
  • TEM
  • Twin boundary
  • Twinning

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