Define a hypo- and a hypereutectic transformation from the below figure:

 

Temperature 12 T3 Solidus 95 A% 100 B% 0 a 90 E O R U a+L 80 y Liquid Liquidus Solidus a+B E 50 35 S Liquidus Solidus B+LS 8/1 B 70 60 40 30 20 10 Hypo-eutectic Hyper-eutectic 5