On the formation of antiphase boundaries in Fe4Al13 intermetallics during a high temperature treatment

In this paper, we report atomic scale observations and formation mechanisms of a high-density antiphase boundaries (APBs) within an ultra-fine-grained Fe4Al13 intermetallic layer at Al/steel interface after heat treatment 596 °C. The results reveal that the APBs are formed by nucleation glide partial dislocations with Burgers vector b/3[010] (b = 12.47 Å). intensive activation locally transforms structure from quasicrystal approximant to quasicrystal. Very few stacking faults nanotwins observed indicating planar defects is mainly driven transformation. This new insight on high density could possibly lead improvement in toughness increasing strength/ductility balance intermetallic.