PPT Slide
From the preceding equations, it can be seen that d is inversely proportional to ?.
Aluminum, which has a high SFE (166 mJ/m2), does exhibit a very small separation between partials: 1 nm.
SFE is very sensitive to composition
Addition of alloying elements in a material helps to decrease the SFE. Examples:
- Brasses have SFE lower than that of Cu,
- Al alloys have SFE lower than that of Al,
- the addition of Al to Cu drops the SFE from 78 to 6 mJ/m2.
Figure 13-5 shows stacking faults in 302 stainless steel viewed by TEM - seen as characteristic fringe (////) pattern.