  Atomistic simulations are used to study linear complexion formation at
dislocations in a body-centered cubic Fe-Ni alloy. Driven by Ni segregation,
precipitation of the metastable B2-FeNi and stable L10-FeNi phases occurs along
the compression side of edge dislocations. If the Ni segregation is not intense
enough to ensure precipitate growth and coalescence along the dislocation
lines, linear complexions in the form of stable nanoscale precipitate arrays
are observed. Critical conditions such as global composition and temperature
are defined for both linear complexion formation and dislocation-assisted
precipitation.
