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 meter
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.
The SFE for magnesium is relatively high, and has a value of 125 mJ m-2 .
The stacking fault energy of Aluminum is higher around 200 mJ m-2