  Linear complexions are stable defect states, where the stress field
associated with a dislocation induces a local phase transformation that remains
restricted to nanoscale dimensions. As these complexions are born at the
defects which control plasticity in metals, it is crucial to understand their
impact on subsequent mechanical properties. In this work, atomistic modeling is
used to understand how dislocation mechanics are altered by the presence of
nanoparticle array linear complexions in a Ni-Al alloy. Molecular dynamics
simulations are used to identify the critical shear stress needed to drive
dislocation breakaway, first for nanoparticle arrays formed by Monte
Carlo/molecular dynamics methods to represent realistic configurations and
subsequently for simplified models that allow the effects of particle spacing
and size to be varied in a controlled manner. A combined bowing and progressive
unpinning mechanism is uncovered, leading to the demonstration of a new
strength scaling law that differs in keys ways from classical Orowan bowing.
