Abstract
On a microscopic scale, deformation twinning is carried by the motion of twinning disconnections. A disconnection is an interfacial line defect characterized by a Burgers vector, a line vector, and a step vector. The Burgers vector (dislocation component of the disconnection) carries the deformation while the step vector (ledge component) carries the transformation from one twin variant to the other. On a mesoscopic scale, the deformation produced by twinning is a simple shear. A moving disclination dipole provides a mesoscopic model accounting for the twinning shear. Twin – twin interaction processes including the intersection of twins, the formation of structured twins, and the nucleation of cracks, may feature very complex mechanisms when analyzed on a microscopic scale. It turns out, however, that these mechanisms are controlled by the properties of large disconnection groups containing up to 10 000 disconnections and more. These properties are sufficiently well approximated in the disclination dipole model. The disclination model for twin – twin interaction predicts orientation and volume fractions of secondary twins. The model also predicts the nucleation of cracks and crack growth. The disclination model was used to analyze the ductile-to-brittle transition of austenitic steel deformed at low temperature. The mesoscopic disclination model for twinning is successful because it accounts for the properties and mechanisms of disconnection groups.
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© 2006 Carl Hanser Verlag, München
Artikel in diesem Heft
- Frontmatter
- Professor Dr. Gernot Kostorz 65 years
- Dislocation micromechanisms under single slip conditions
- Characterisation of short-range order using dislocations
- Between microscopic and mesoscopic descriptions of twin–twin interaction
- Influence of the thermoelastic effect on the acoustic properties of pure metals at low temperatures
- Recent progress in the area of bulk metallic glasses
- Formation of the ABC6-type ordered structure in fcc alloys
- Short-range order in Fe-21.9 at.% Al
- Criteria for developing castable, creep-resistant aluminum-based alloys – A review
- Phase decomposition and precipitation of metastable A2 phase in B2 ordered Co–Al–Fe alloys
- Atomic migration and ordering phenomena in bulk and thin films of FePd and FePt
- Late-stage coarsening of oil droplets of excess oil in microemulsions following a temperature quench
- Small-angle scattering from spherical particles on randomly oriented interfaces
- Ripening of L12 Ni3Ti precipitates in the framework of the trans-interface diffusion-controlled theory of particle coarsening
- Texture evolution in equiaxed polycrystalline L10-ordered FePd during coarsening at 600 °C
- Modulated structures in amorphous films of Cr-silicide prepared by electron-beam-deposition
- Early stages of nucleation and growth of Guinier –Preston zones in Al–Zn–Mg and Al–Zn–Mg–Cu alloys
- Experimental and theoretical characterization of Al3Sc precipitates in Al–Mg–Si–Cu–Sc–Zr alloys
- Ag2Al plates in Al–Ag alloys
- A critical analysis of the composite model as applied to high-temperature creep of Al and an Al–Mg alloy
- Damage behaviour of an Al2O3 particle-reinforced 6061 alloy induced by monotonic and cyclic deformation
- Deformation behaviour of ultrafine-grained magnesium with 3 vol.% graphite
- Press/Presse
- Conferences/Konferenzen
- Frontmatter
- Editorial
- Professor Dr. Gernot Kostorz 65 years
- Articles BBasic
- Dislocation micromechanisms under single slip conditions
- Characterisation of short-range order using dislocations
- Between microscopic and mesoscopic descriptions of twin–twin interaction
- Influence of the thermoelastic effect on the acoustic properties of pure metals at low temperatures
- Recent progress in the area of bulk metallic glasses
- Formation of the ABC6-type ordered structure in fcc alloys
- Short-range order in Fe-21.9 at.% Al
- Criteria for developing castable, creep-resistant aluminum-based alloys – A review
- Phase decomposition and precipitation of metastable A2 phase in B2 ordered Co–Al–Fe alloys
- Atomic migration and ordering phenomena in bulk and thin films of FePd and FePt
- Late-stage coarsening of oil droplets of excess oil in microemulsions following a temperature quench
- Small-angle scattering from spherical particles on randomly oriented interfaces
- Ripening of L12 Ni3Ti precipitates in the framework of the trans-interface diffusion-controlled theory of particle coarsening
- Articles AApplied
- Texture evolution in equiaxed polycrystalline L10-ordered FePd during coarsening at 600 °C
- Modulated structures in amorphous films of Cr-silicide prepared by electron-beam-deposition
- Early stages of nucleation and growth of Guinier –Preston zones in Al–Zn–Mg and Al–Zn–Mg–Cu alloys
- Experimental and theoretical characterization of Al3Sc precipitates in Al–Mg–Si–Cu–Sc–Zr alloys
- Ag2Al plates in Al–Ag alloys
- A critical analysis of the composite model as applied to high-temperature creep of Al and an Al–Mg alloy
- Damage behaviour of an Al2O3 particle-reinforced 6061 alloy induced by monotonic and cyclic deformation
- Deformation behaviour of ultrafine-grained magnesium with 3 vol.% graphite
- Notifications/Mitteilungen
- Press/Presse
- Conferences/Konferenzen
Artikel in diesem Heft
- Frontmatter
- Professor Dr. Gernot Kostorz 65 years
- Dislocation micromechanisms under single slip conditions
- Characterisation of short-range order using dislocations
- Between microscopic and mesoscopic descriptions of twin–twin interaction
- Influence of the thermoelastic effect on the acoustic properties of pure metals at low temperatures
- Recent progress in the area of bulk metallic glasses
- Formation of the ABC6-type ordered structure in fcc alloys
- Short-range order in Fe-21.9 at.% Al
- Criteria for developing castable, creep-resistant aluminum-based alloys – A review
- Phase decomposition and precipitation of metastable A2 phase in B2 ordered Co–Al–Fe alloys
- Atomic migration and ordering phenomena in bulk and thin films of FePd and FePt
- Late-stage coarsening of oil droplets of excess oil in microemulsions following a temperature quench
- Small-angle scattering from spherical particles on randomly oriented interfaces
- Ripening of L12 Ni3Ti precipitates in the framework of the trans-interface diffusion-controlled theory of particle coarsening
- Texture evolution in equiaxed polycrystalline L10-ordered FePd during coarsening at 600 °C
- Modulated structures in amorphous films of Cr-silicide prepared by electron-beam-deposition
- Early stages of nucleation and growth of Guinier –Preston zones in Al–Zn–Mg and Al–Zn–Mg–Cu alloys
- Experimental and theoretical characterization of Al3Sc precipitates in Al–Mg–Si–Cu–Sc–Zr alloys
- Ag2Al plates in Al–Ag alloys
- A critical analysis of the composite model as applied to high-temperature creep of Al and an Al–Mg alloy
- Damage behaviour of an Al2O3 particle-reinforced 6061 alloy induced by monotonic and cyclic deformation
- Deformation behaviour of ultrafine-grained magnesium with 3 vol.% graphite
- Press/Presse
- Conferences/Konferenzen
- Frontmatter
- Editorial
- Professor Dr. Gernot Kostorz 65 years
- Articles BBasic
- Dislocation micromechanisms under single slip conditions
- Characterisation of short-range order using dislocations
- Between microscopic and mesoscopic descriptions of twin–twin interaction
- Influence of the thermoelastic effect on the acoustic properties of pure metals at low temperatures
- Recent progress in the area of bulk metallic glasses
- Formation of the ABC6-type ordered structure in fcc alloys
- Short-range order in Fe-21.9 at.% Al
- Criteria for developing castable, creep-resistant aluminum-based alloys – A review
- Phase decomposition and precipitation of metastable A2 phase in B2 ordered Co–Al–Fe alloys
- Atomic migration and ordering phenomena in bulk and thin films of FePd and FePt
- Late-stage coarsening of oil droplets of excess oil in microemulsions following a temperature quench
- Small-angle scattering from spherical particles on randomly oriented interfaces
- Ripening of L12 Ni3Ti precipitates in the framework of the trans-interface diffusion-controlled theory of particle coarsening
- Articles AApplied
- Texture evolution in equiaxed polycrystalline L10-ordered FePd during coarsening at 600 °C
- Modulated structures in amorphous films of Cr-silicide prepared by electron-beam-deposition
- Early stages of nucleation and growth of Guinier –Preston zones in Al–Zn–Mg and Al–Zn–Mg–Cu alloys
- Experimental and theoretical characterization of Al3Sc precipitates in Al–Mg–Si–Cu–Sc–Zr alloys
- Ag2Al plates in Al–Ag alloys
- A critical analysis of the composite model as applied to high-temperature creep of Al and an Al–Mg alloy
- Damage behaviour of an Al2O3 particle-reinforced 6061 alloy induced by monotonic and cyclic deformation
- Deformation behaviour of ultrafine-grained magnesium with 3 vol.% graphite
- Notifications/Mitteilungen
- Press/Presse
- Conferences/Konferenzen