Dislocation structure during creep of MgO single crystals

The dislocation substructure generated during compressive creep of MgO single crystals has been investigated using both etch-pit and transmission electron microscopy techniques. The type of dislocation substructure is dependent on strain. During transient creep nearly parallel cell walls are found w...

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Veröffentlicht in:Philosophical magazine (London, England : 1945) England : 1945), 1973-08, Vol.28 (2), p.363-371
Hauptverfasser: Hüther, W., Reppich, B.
Format: Artikel
Sprache:eng
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Zusammenfassung:The dislocation substructure generated during compressive creep of MgO single crystals has been investigated using both etch-pit and transmission electron microscopy techniques. The type of dislocation substructure is dependent on strain. During transient creep nearly parallel cell walls are found whereas in steady state creep a nearly equiaxed network of cells is built up. Measurements of the density ρ of dislocations not associated with cell walls and of the cell wall area per volume S v reveal the following trends: During primary creep both ρ and S v are functions of strain; ρ decreases while S v increases with increasing strain. During steady state creep ρ and S v are constant. The isothermal stress dependence of the steady state values of ρ and S v can be described by relations ρ ∼ σ 1·4 , and S V ∼σ 0·7 .
ISSN:0031-8086
DOI:10.1080/14786437308217459