Stacking-fault energy
![A graph of how SFE quickly diminishes with zinc alloy content. Data taken from.[6][7]](/Images/godic/202502/12/Stacking_fault_energy_of_Cu-Zn_alloys3919.png")
![A graph of how SFE quickly diminishes with aluminum alloy content. Data taken from.[8][9][10]](/Images/godic/202502/12/Stacking_fault_energy_of_Cu-Al_alloys3919.png")
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. Stacking-fault energy is a primary factor in determining the wear resistance of a metal and, primarily, its resistance to galling.