  The two-dimensional dislocation dynamics approach has been recently used for
analyzing plastic deformation in metals and alloys at elevated temperatures.
The two-dimensional approach, however, only accounts for the dislocation
climbing process, and it assumes that dislocation bypassing and shearing of
precipitates are negligible. To examine the validity of this assumption, this
study quantifies dislocation bypassing and shearing of precipitates in terms of
critical resolved shear stress, interaction time, and thermal activation energy
for various precipitate strength levels, temperatures, and precipitate
spacings. This study uses a modified dislocation dynamics approach that
accounts for shearable and non-shearable precipitates. Simulations focus on the
overdriven dislocation dynamics regime wherein the climbing process is limited
by fast interactions between dislocations and precipitates. The results show
that even though the resolved shear stress level required for a dislocation to
overcome an array of precipitates decreases at higher temperatures, the
interaction time between the dislocation and the precipitates increases. In
addition, the maximum ratio of thermal activation energy to the precipitate
energy barrier is only 0.15.
