The Nanostructured Origin of Deformation Twinning

We have revealed the fundamental embryonic structure of deformation twins using in situ mechanical testing of magnesium single crystals in a transmission electron microscope. This structure consists of an array of twin-related laths on the scale of several nanometers. A computational model demonstra...

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Bibliographic Details
Published in:Nano letters 2012-02, Vol.12 (2), p.887-892
Main Authors: Yu, Qian, Qi, Liang, Chen, Kai, Mishra, Raja K, Li, Ju, Minor, Andrew M
Format: Article
Language:English
Subjects:
Alloys
Arrays
Condensed matter: structure, mechanical and thermal properties
Deformation
Deformation and plasticity (including yield, ductility, and superplasticity)
Electron microscopes
Exact sciences and technology
Magnesium
Magnesium - chemistry
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Microscopy, Electron, Transmission
Molecular Dynamics Simulation
Monte Carlo Method
Nanostructure
Nanostructures - chemistry
Nucleation
Origins
Particle Size
Physics
Surface Properties
Twinning
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Summary:We have revealed the fundamental embryonic structure of deformation twins using in situ mechanical testing of magnesium single crystals in a transmission electron microscope. This structure consists of an array of twin-related laths on the scale of several nanometers. A computational model demonstrates that this structure should be a generic feature at the incipient stage of deformation twinning when there are correlated nucleation events. Our results shed light on the origin of twinning-induced plasticity and transformation toughening, critical to the development of advanced structural alloys with high strength, ductility, and toughness.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl203937t