Stacking-fault Energy

The stacking-fault energy (SFE) is a material property on a very small scale. It is noted as γSFE in units of joules per square metre.

A stacking fault is a one or two layer interruption in the stacking sequence of the 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 determined by the stacking fault energy. When the SFE is high, the dissociation of a perfect dislocation into two partial is unlikely and the material deforms only by dislocation glide. Lower SFE materials display wider stacking faults and have more difficulties for cross-slip and climb. 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.

Material Ag (Silver) Si (Silicon) Ni (Nickel) Cu (Copper) Mg (Magnesium) Al (Aluminum)
SFE (mJ m−2) 20-30 >42 90 70 -78 125 160-200

Read more about Stacking-fault Energy:  Stacking Faults and Stacking Fault Energy, Influences On Stacking Fault Energy, Effects of Stacking Fault Energy On Deformation and Texture

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Stacking-fault Energy - Effects of Stacking Fault Energy On Deformation and Texture - Low SFE Materials
... Low SFE materials also twin when strained ... If deformation twinning is combined with regular shear deformation, the grains eventually align towards a more preferred orientation ...

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