To "polar" region
of grain

Use the buttons to vary the applied stress and temperature, observing
the effects these variables have on diffusion and grain deformation

At low homologous temperatures there is not enough thermal energy
for significant diffusion to occur and so the grain cannot deform

When there is no applied stress, there is no driving force for
diffusion in a particular direction and so no grain deformation

When σ is increased, there is a greater driving force for diffusion
towards the "polar" regions from the "equatorial" regions and
so, for a given T, the grain deforms faster at higher σ

σ/σ_y

T/T_m