Why twins do not grow at the speed of sound all the time

Deformation twinning occurs in various materials including metals, intermetallics, ceramics, superconductors, and even geological systems. The rate of twin growth depends on the material system, but there are no crystallographic models to understand the mechanisms of slow twin growth. The physics of...

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Bibliographic Details
Published in:Physical review letters 2005-10, Vol.95 (16), p.165501.1-165501.4, Article 165501
Main Authors: OBERSON, Paul G, ANKEM, Sreeramamurthy
Format: Article
Language:English
Subjects:
Acoustical properties of solids
ACTIVATION ENERGY
BCC LATTICES
CERAMICS
Condensed matter: structure, mechanical and thermal properties
CRYSTAL GROWTH
CRYSTALLOGRAPHY
DEFORMATION
DIFFUSION
Exact sciences and technology
INTERFACES
INTERMETALLIC COMPOUNDS
MATERIALS SCIENCE
Mechanical and acoustical properties of condensed matter
OXYGEN
Physics
SUPERCONDUCTORS
TITANIUM ALLOYS
TWINNING
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Summary:Deformation twinning occurs in various materials including metals, intermetallics, ceramics, superconductors, and even geological systems. The rate of twin growth depends on the material system, but there are no crystallographic models to understand the mechanisms of slow twin growth. The physics of twin growth is presented for bcc-Ti alloys where it is shown that octahedral interstitial sites are not conserved at the twin-matrix interface where oxygen resides. The predicted activation energy for twin growth correlated well with experimental values for the diffusion of oxygen. These models will have a broad application in understanding the twinning process and designing advanced materials.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.95.165501