Figure 9.

(a) θ-σ curve at 573 K and 0.01 s⁻¹. Note that it is divided into three stages marked by I, II and III, respectively; (b) relationship between ln ${\epsilon }_c$ and ln Z; (c) relationship between ln ${\epsilon }_{0.5}$ and ln Z; (d) ln (−ln (($1-\left({\sigma }_p-\sigma \right)/\left({\sigma }_p-{\sigma }_{ss}\right))))$ as a function of ln $\left(\left(\epsilon -{\epsilon }_c\right)/{\epsilon }_{0.5}\right)$.