Stacking fault energy in sapphire (α-Al203)

Lagerlöf, K.D.P.; Mitchell, T. E.; Heuer, A. H.; Rivière, J.P.; Cadoz, J.; Castaing, J.; Phillips, David S.

doi:10.1016/0001-6160(84)90206-2

Cited by 74 publications

(46 citation statements)

References 12 publications

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“…The Burgers vectors of the fractional dislocations involved in the core spreading possess components that are perpendicular to spreading planes. The existence of climb cores has been reported in several materials [44][45][46][47][48][49]. Such dissociations usually imply severe restrictions to dislocation movement, in particular when the temperature is decreased to the level at which dislocation climb is inhibited.…”

Section: Iv22 Dislocation Behaviourmentioning

confidence: 99%

Al–Pd–Mn icosahedral quasicrystal: deformation mechanisms in the brittle domain

Texier

Joulain

Bonneville

et al. 2007

Philosophical Magazine

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Section: Iv22 Dislocation Behaviourmentioning

confidence: 99%

Al–Pd–Mn icosahedral quasicrystal: deformation mechanisms in the brittle domain

Texier

Joulain

Bonneville

et al. 2007

Philosophical Magazine

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“…As pointed out by Phillips et al, 24) the separation distance by the glide dissociation is considered to be too narrow to distinguish by the conventional electron microscopy techniques. On the other hand, Lagerlöf et al 25) confirmed the dissociation of a basal dislocation by selfclimb using the weak-beam dark field technique. According to their results, a basal dislocation dissociated into the two partials with b 1 ¼ 1=3h10 1 10i and b 2 ¼ 1=3h01 1 10i perpendicularly to the (0001) slip plane.…”

Section: High Temperature Compression Methodsmentioning

confidence: 99%

“…Thus, it was reconfirmed that the basal dislocation dissociate into two half partials, as reported in the past. 24,25) The two partials separate with a distance of 4.7 nm along the [0001] in the Fig. 3(a).…”

Section: High Temperature Compression Methodsmentioning

confidence: 99%

Oxide Ceramics with High Density Dislocations and Their Properties

Ikuhara

2009

Mater. Trans.

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Dislocations are of scientific and technological interest due to their unusual physical properties, which are quite different from those in the bulk. It is, therefore, expected to use dislocations as nanowires which provide functional properties in a crystal. In this study, high densities of dislocations were introduced in oxide single crystals by high-temperature plastic deformation. Insulating sapphire and YSZ single crystal were used as model systems. The electron and ion conductivities were measured for the dislocation introduced crystals respectively. It was found that the dislocations with Ti segregation in sapphire crystal showed excellent electrical conductivity and dislocations themselves in YSZ crystal improved the ionic conductivity. This technique has a potential to be applied for any crystals because of its simplicity, and will be expected to give special and unprecedented properties to common materials.

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“…This reaction has been observed during the dissociation of the prism plane dislocations [20][21][22] and within dislocation networks produced by crack healing [20,23]. In the following section, the Burgers vector in alumina-based nanocomposites is considered to be 1 9 o1 12 04 type, with a magnitude of 0.4759/3E0.16 nm [18,20].…”

Section: Burgers Vectormentioning

confidence: 99%

Prediction of fracture strength in Al₂O₃/SiC_pceramic matrix nanocomposites

Zhang

Chen²

2007

Science and Technology of Advanced Materials

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Based primarily on a recent publication [S.M. Choi, H. Awaji, Sci. Tech. Adv. Mater. 6 (2005) 2-10.], where the dislocations around the nano-sized particles in the intra-granular type of ceramic matrix nanocomposites (CMNCs) were modeled, dislocation activities in Al 2 O 3 /SiC p CMNCs were discussed in relation to the processing conditions. The dislocations around the nano-sized particles, caused by the thermal mismatch between the ceramic matrix and nano-sized particles, were assumed to hold out the effect of Orowan-like strengthening, although the conventional Owowan loops induced by the movement of dislocations were unlikely in the ceramic matrix at room temperature. A model involving the yield strength of metal matrix nanocomposites (MMNCs), where the Owowan strengthening effect was taken into consideration, was thus modified and extended to predict the fracture strength of the intra-granular type of CMNCs without and with annealing. On the basis of the characteristics of dislocations in the CMNCs, the load-bearing effect and Orowan-like strengthening were considered before annealing, while the load-bearing effect and enhanced dislocation density strengthening were taken into account after annealing. The model prediction was found to be in agreement with the experimental data of Al 2 O 3 /SiC p nanocomposites reported in the literature. r

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Stacking fault energy in sapphire (α-Al203)

Cited by 74 publications

References 12 publications

Al–Pd–Mn icosahedral quasicrystal: deformation mechanisms in the brittle domain

Al–Pd–Mn icosahedral quasicrystal: deformation mechanisms in the brittle domain

Oxide Ceramics with High Density Dislocations and Their Properties

Prediction of fracture strength in Al₂O₃/SiC_pceramic matrix nanocomposites

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Stacking fault energy in sapphire (α-Al203)

Cited by 74 publications

References 12 publications

Al–Pd–Mn icosahedral quasicrystal: deformation mechanisms in the brittle domain

Al–Pd–Mn icosahedral quasicrystal: deformation mechanisms in the brittle domain

Oxide Ceramics with High Density Dislocations and Their Properties

Prediction of fracture strength in Al2O3/SiCpceramic matrix nanocomposites

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Prediction of fracture strength in Al₂O₃/SiC_pceramic matrix nanocomposites