Acoustic and Electron Microscopy Study of the Dislocation Structure in MgO Crystals

Kardashev, B. K.; Kustov, S.; Лебедев, А. Б.; Berezhkova, G. V.; Perstnev, P. P.; Appel, F.; Messerschmidt, U.

doi:10.1002/pssa.2210910111

Cited by 8 publications

(1 citation statement)

References 16 publications

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“…phonon drag and interactions between charged dislocations and their compensating charged clouds). Without any reliable value of B in MgO (Kardashev et al, 1985) a common value measured in ionic crystals of B = 10 À5 Pa s is considered (Robinson, 1972;Singh et al, 2008). Results of DD simulations are not expected to depend on the details of this free flight mobility law in materials with forest strengthening.…”

Section: Massive Dd Simulationsmentioning

confidence: 98%

Dislocation reactions, plastic anisotropy and forest strengthening in MgO at high temperature

Amodeo

Devincre

Carrez

et al. 2014

Mechanics of Materials

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Section: Massive Dd Simulationsmentioning

confidence: 98%

Dislocation reactions, plastic anisotropy and forest strengthening in MgO at high temperature

Amodeo

Devincre

Carrez

et al. 2014

Mechanics of Materials

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Effect of temperature on amplitude-dependent internal friction and yield stress in crystals

Лебедев

Kustov

1989

Phys. Stat. Sol. (a)

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The temperature dependence of the ultrasonic amplitude u,(T) a t a constant level of reversible dislocation strain is derived from the data on the amplitude-dependent internal friction. Comparing a, ( T) with the temperature dependence of the macroscopic yield stress u,( T) reveals that us( T) is proportional to a, ( T) within the temperature range of 4.2 to 300 K for a large variety of crystals.The reasons for this proportionality are discussed in terms of (i) a general mechanism of thermally activated dislocation motion for both micro-and macro-deformations and (ii) a universal stressinduced mechanism (not thermally activated) which itself is temperature-dependent.Die Temperaturabhsngigkeit der Ultraschallamplitude u,( T), die einem konstanten Wert der reversiblen Versetzungsverformung entspricht, wird aus den Daten der amplitudenabhangigen inneren Reibung erhalten. Beim Vergleich mit der Temperaturabhangigkeit der makroskopischen FlieDgrenze a , ( T) wird gefunden, da5 a*( T) im Temperaturbereich von 4,2 bis 300 K proportional zu a,(T) fur eine Vielzahl von Kristallen verliiuft. Als Grund fur diem Proportionalitiit wird diskutiert (1) ein genereller Mechanismus der thermisch aktivierten Versetzungsbewegung fur die Mikro-und Makroverformung bzw. (2) ein universeller spannungsinduzierternicht thermisch aktivierter -Mechanismus, welcher als solcher temperaturabhsngig ist.

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Internal Friction Nondestructive Evaluation of Plastic Properties of Crystals

Лебедев

1998

Nondestructive Characterization of Materials VIII

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Acoustic and Electron Microscopy Study of the Dislocation Structure in MgO Crystals

Cited by 8 publications

References 16 publications

Dislocation reactions, plastic anisotropy and forest strengthening in MgO at high temperature

Dislocation reactions, plastic anisotropy and forest strengthening in MgO at high temperature

Effect of temperature on amplitude-dependent internal friction and yield stress in crystals

Internal Friction Nondestructive Evaluation of Plastic Properties of Crystals

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