  Orowan strengthening is a primary way of strengthening metallic materials.The
effect of temperature on the Orowan strengthening mechanism is still debatable
in the present day.In this study,the effect of temperature on the Orowan
strengthening mechanism is systematically investigated,a thermal activation
Orowan strengthening mechanism is developed,and the corresponding Orowan stress
is deduced.The results indicate that the obstacle scales substantially affect
the thermal activation-based dislocation that bypasses the precipitates
processes.In small obstacle scales,the thermal activation contribution to
Orowan stress cannot be ignored;while in large obstacle scales,the thermal
activation contribution can be ignored even at high temperatures.In addition to
temperature, the effects of shear modulus,strain rate, and dislocation density
are investigated on Orowan stress.This work not only provides new insight into
the Orowan strengthening mechanism but also aids in the development of new
high-temperature structural materials.
