Microstructure Modification of Wrought Zn-8%AlZn-based Alloy

Zn-8%Al alloy was manufactured through casting, extrusion and drawing technique.The microstructure and phase transition were observed under OM and SEM.The peritectic (L+α→β), eutectic (L→η+β) and eutectoid (β→η+α) microstructures were dominative in solidification of casting, then coarse-grained dentrite was broken and fined during extrusion process, meanwhile the eutectoid transition β→ α+η took place.The dynamic recrystallization was considered due to high distortion heat during extrusion and drawing processes.The work softening was explained in term of dynamic recovery and recrystallization.The continuous transformation η→η_m'+η'→η+α may take place besides dynamic recrystallization and recovery in the drawing process.