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Statements

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dbr:Galling
dbo:wikiPageWikiLink
dbr:Stacking-fault_energy
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dbr:Crystal_twinning
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dbr:Stacking-fault_energy
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dbr:Dislocation
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dbr:Stacking-fault_energy
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dbr:Tempering_(metallurgy)
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dbr:Stacking-fault_energy
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Stapelfehlerenergie Stacking-fault energy
rdfs:comment
The stacking-fault energy (SFE) is a materials property on a very small scale. It is noted as γSFE in units of energy per area. A stacking fault is an interruption of the normal stacking sequence of atomic planes in a close-packed crystal structure. These interruptions carry a certain stacking-fault energy. The width of stacking fault is a consequence of the balance between the repulsive force between two partial dislocations on one hand and the attractive force due to the surface tension of the stacking fault on the other hand. The equilibrium width is thus partially determined by the stacking-fault energy. When the SFE is high the dissociation of a full dislocation into two partials is energetically unfavorable, and the material can deform either by dislocation glide or cross-slip. Lower Die verallgemeinerte Stapelfehlerenergie (SFE) ("gamma") gibt die Energie pro Fläche eines idealen, unendlich ausgedehnten Stapelfehlers an, sie stellt also eine Energie-Flächendichte dar. Wesentlich für die Charakterisierung der plastischen Deformation sind die instabile Stapelfehlerenergie – das erste Maximum – und die stabile Stapelfehlerenergie – das zweite Minimum (vgl. zweite Abb.). Bei der Bildung eines Stapelfehlers muss die der instabilen Stapelfehlerenergie überwunden werden. Die Differenz aus den beiden Energien ist ein Maß für die Duktilität eines Materials.
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dbr:Crystal n4:Stacking_fault_energy_of_Cu-Al_alloys.png dbr:Silver n4:Stacking_fault_energy_of_Cu-Zn_alloys.png dbr:Nickel dbr:Crystal_structure dbr:Zinc dbr:Dislocation dbr:Stacking_fault dbr:Millijoule dbr:Magnesium dbr:Surface_tension dbc:Materials_science dbr:Gold dbr:Copper dbr:Slip_(materials_science) dbr:Silicon dbr:Aluminum
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n11:Stacking_fault_energy_of_Cu-Zn_alloys.png?width=300
dbo:abstract
Die verallgemeinerte Stapelfehlerenergie (SFE) ("gamma") gibt die Energie pro Fläche eines idealen, unendlich ausgedehnten Stapelfehlers an, sie stellt also eine Energie-Flächendichte dar. Wesentlich für die Charakterisierung der plastischen Deformation sind die instabile Stapelfehlerenergie – das erste Maximum – und die stabile Stapelfehlerenergie – das zweite Minimum (vgl. zweite Abb.). Bei der Bildung eines Stapelfehlers muss die der instabilen Stapelfehlerenergie überwunden werden. Die Differenz aus den beiden Energien ist ein Maß für die Duktilität eines Materials. The stacking-fault energy (SFE) is a materials property on a very small scale. It is noted as γSFE in units of energy per area. A stacking fault is an interruption of the normal stacking sequence of atomic planes in a close-packed crystal structure. These interruptions carry a certain stacking-fault energy. The width of stacking fault is a consequence of the balance between the repulsive force between two partial dislocations on one hand and the attractive force due to the surface tension of the stacking fault on the other hand. The equilibrium width is thus partially determined by the stacking-fault energy. When the SFE is high the dissociation of a full dislocation into two partials is energetically unfavorable, and the material can deform either by dislocation glide or cross-slip. Lower SFE materials display wider stacking faults and have more difficulties for cross-slip.The SFE modifies the ability of a dislocation in a crystal to glide onto an intersecting slip plane. When the SFE is low, the mobility of dislocations in a material decreases.
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