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Transformation-deformation bands in C60after the treatment in a shear diamond anvil cell
- Source :
- Materials Research Express. 3:045601
- Publication Year :
- 2016
- Publisher :
- IOP Publishing, 2016.
-
Abstract
- The C60 fullerene has been investigated by high-resolution transmission electron microscopy and electron energy loss spectroscopy in a shear diamond anvil cell after applying pressure and shear deformation treatment of fcc phase. Shear transformation-deformation bands are revealed consisting of shear-strain-induced nanocrystals of linearly polymerized fullerene and polytypes, the triclinic, monoclinic, and hcp C60, fragments of amorphous structures, and voids. Consequently, after pressure release, the plastic strain retains five high pressure phases, which is potentially important for their engineering applications. Localized shear deformation initially seems contradictory because high pressure phases of C60 are stronger than the initial low pressure phase. However, this was explained by transformation-induced plasticity during localized phase transformations. It occurs due to a combination of applied stresses and internal stresses from a volume reduction during phase transformations. Localized phase transformations and plastic shear deformation promote each other, which produce positive mechanochemical feedback and cascading transformation-deformation processes. Since the plastic shear in a band is much larger than is expected based on the torsion angle, five phase transformations occur in the same region with no transformation outside the band. The results demonstrate that transformation kinetics cannot be analyzed in terms of prescribed shear, and methods to measure local shear should be developed.
- Subjects :
- 010302 applied physics
Materials science
Polymers and Plastics
Electron energy loss spectroscopy
Metals and Alloys
02 engineering and technology
Plasticity
021001 nanoscience & nanotechnology
01 natural sciences
Diamond anvil cell
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Amorphous solid
Biomaterials
Shear modulus
Condensed Matter::Materials Science
Crystallography
Shear (geology)
Critical resolved shear stress
0103 physical sciences
Deformation bands
Composite material
0210 nano-technology
Subjects
Details
- ISSN :
- 20531591
- Volume :
- 3
- Database :
- OpenAIRE
- Journal :
- Materials Research Express
- Accession number :
- edsair.doi...........88be50dfcdb9acf40c54a9e961cade15