Formation of a Structure in Cobalt Single Crystals at the b -a Transformation

摘要

On cooling, cobalt undergoes a polymorphous transformation from f.c.c. to h.c.p. The temperature corresponding to the equilibrium between the hightemperature β (f.c.c.) and low-temperature α(h.c.p.) phases in cobalt is 417°C [1]. The polymorphous transformation in cobalt is of the diffusionless type and also has other features of martensitic transformation. The orientational relationships at the β → αtransition