Fig. 3.

Kinetics of ordering in sample IL-15 following rapid (< 1 min) cooling from 60 °C. (A) Development of elasticity, evidenced by growth in the dynamic elastic modulus G′(ω = 0.1 rad s⁻¹), is associated with the transition from a state of disorder to order. (B) Time-temperature-transformation diagram, which shows the transition from nucleation limited growth of the BCC phase as T → T_ODT to a diffusion limited mode at T << T_ODT. Below about 28 °C the ordering kinetics change, coincident with the growth of the Frank–Kasper σ-phase at long times.