先进材料疑固实验室 Solidification of peritectics Laboratory of Advanced Materials Solidification Slow growth speed: (a) (b) (c) (d) (e) (D Fig.9.30 A summary of peritectic microstructures observed at very low speed dur ing solidification in a vertical thermal gradient:(a)Bands;(b)Islands;(c)Single transition from a to B;(d)Coupled growth of o-and B-lamellae;(e)Nucleation of in the liquid ahead of a 3-e planar front;(f)Helicoidal structure.(a-d)Hypoperi tectic compositions;(e-f)Hyperitectic compositions.(After Boettinger et al.[61.) 上浒充通大 SHANGHAI JIAO TONG UNIVERSITYSolidification of peritectics Slow growth speed: