Classification 上游充通大学 SHANGHAI JIAO TONG UNIVERSITY Based on whether there are "thermally activated atomic movements": Diffusional transformations>Majority of transformations! Diffusionless transformations>Martensitic transformation Diffusional transformations: induced by a change of temperature ■ in a solid-state alloy of a fixed bulk composition AO TONG K.Chen 12K. Chen Based on whether there are “thermally activated atomic movements”:  Diffusional transformations  Majority of transformations!  Diffusionless transformations  Martensitic transformation Diffusional transformations:  induced by a change of temperature  in a solid-state alloy of a fixed bulk composition Classification 12