The influence of silicon and aluminum alloying on the lattice parameter and stacking fault energy of austenitic steel

The influence of Si and Al on the lattice parameter and stacking fault energy (SFE) of austenitic steel was studied. X-ray diffraction indicated that 2.5 wt.% Al alloying increased the austenite lattice parameter by 1.41 × 10−3 nm, whereas 2.5 wt.% Si alloying had little effect. Partial dislocation separation measurements from weak-beam dark-field images indicated that 2.5 wt.% Al alloying increased the SFE by 12–17 mJ m−2 and 2.5 wt.% Si alloying decreased the SFE by 6–7 mJ m−2.