Exhaustion mechanisms in the Preyield domain of niobium single crystals at low temperatures

Böudet, Alain M.; Kubin, L.P.

doi:10.1051/jphys:01975003609082300

Cited by 10 publications

(8 citation statements)

References 18 publications

(16 reference statements)

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“…Edge dislocations are shorter and glide at higher velocity when compared to screw. In MgO, they are generally observed during the first stage of deformation similarly to α-iron [30], except in the case of dipoles formation [25]. Beyond the transition temperature, dislocations exhibit a viscous behavior typical of fcc metals as shown, e.g., in the work of Clauer and Wilcox [10].…”

Section: Temperature-dependent Dislocation Microstructuresmentioning

confidence: 85%

Dislocations and Plastic Deformation in MgO Crystals: A Review

et al. 2018

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This review paper focuses on dislocations and plastic deformation in magnesium oxide crystals. MgO is an archetype ionic ceramic with refractory properties which is of interest in several fields of applications such as ceramic materials fabrication, nano-scale engineering and Earth sciences. In its bulk single crystal shape, MgO can deform up to few percent plastic strain due to dislocation plasticity processes that strongly depend on external parameters such as pressure, temperature, strain rate, or crystal size. This review describes how a combined approach of macro-mechanical tests, multi-scale modeling, nano-mechanical tests, and high pressure experiments and simulations have progressively helped to improve our understanding of MgO mechanical behavior and elementary dislocation-based processes under stress.

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Section: Temperature-dependent Dislocation Microstructuresmentioning

confidence: 85%

Dislocations and Plastic Deformation in MgO Crystals: A Review

et al. 2018

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“…In the vicinity of the interface, the dislocations are mostly of screw type; their low density could reveal an 'exhaustion' mechanism of the mobile dislocations, a process well known in the bcc metals where the residual deformation decreases rapidly with the number of cycles [10]. In the austenite and near the interface, no variation of the dislocation density and character has been revealed, indicating the absence of persistent slip bands.…”

Section: Microstructures Of the Bicrystals Notched In αmentioning

confidence: 98%

“…Despite the great number of cycles, the dislocation density is still very low and microstructural evolution seems negligible. This behaviour could correspond to a microdeformation regime almost reversible, which accounts for the 'go to and fro' motion [10]. This regime is characteristic of a 'preyield' field.…”

Section: Microstructures Of the Bicrystals Notched In γmentioning

confidence: 98%

“…Unexpectedly, the activated slip systems ([-111](110) or (101), [1][2][3][4][5][6][7][8][9][10][11](-101)) are those having low Schmid factor values, less than 0.292. The dislocations are less numer- ous than those found in the bicrystal A-α, and their straight profile suggests that no cross-slip mechanism occurred [6].…”

Section: Dislocation Analysis In Bicrystal A-γmentioning

confidence: 99%

“…Stresses are concentrated at the vicinity of the interface in the γ -phase and form dislocation tangles. The primary slip system [1][2][3][4][5][6][7][8][9][10] (2)) as those analysed in A-α bicrystal. The activated slip planes and slip directions are not parallel, so the transmission factors have very small values.…”

Section: Dislocation Analysis In Bicrystal A-γmentioning

confidence: 99%

See 2 more Smart Citations

Role of interfaces in duplex stainless steel deformation micromechanisms

Taisne¹,

Décamps²,

Priester³

2006

Composite Interfaces

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Elementary fatigue deformation mechanisms in duplex stainless steel bicrystals are studied by transmission electron microscopy (TEM). Attention is paid to the interaction between lattice dislocations and ferrite/austenite interfaces depending upon the orientation relationship (plastically compatible or incompatible) and the initial deformation (in the α-phase or in the γ -phase). Furthermore, an attempt is made to understand the behaviour under mechanical solicitation of each phase in the bicrystal and to compare it with the single crystal deformation behaviour.

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Evidence for the interaction between magnetic domain walls and dislocations in high-purity iron from magnetomechanical damping experiments

Degauque

Astie

Kubin

1978

Phys. Stat. Sol. (a)

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The magnetomechanical damping, when plotted as a function of the amplitude of an alternative shear strain, exhibits a maximum, from which it is possible to deduce the effective internal stress opposed to the motion of 90° magnetic domain walls. High‐purity specimens of iron are strained up to 3% at room temperature, and from the variation of internal strain with applied stress it is shown that the effective internal stress is proportional to the square root of dislocation density. During further straining at 77K, the interaction between 90° magnetic domain walls and dislocation tangles is evidenced: the dislocation density inside the tangles decreases together with the effective internal stress, while the mobility of magnetic domain walls increases. The dislocation density inside the tangles is calculated for the sample prestrained 3% at room temperature from the values of the effective internal stress.

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Exhaustion mechanisms in the Preyield domain of niobium single crystals at low temperatures

Cited by 10 publications

References 18 publications

Dislocations and Plastic Deformation in MgO Crystals: A Review

Dislocations and Plastic Deformation in MgO Crystals: A Review

Role of interfaces in duplex stainless steel deformation micromechanisms

Evidence for the interaction between magnetic domain walls and dislocations in high-purity iron from magnetomechanical damping experiments

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