Effect of Temperature & Holding Time on Recrystallization Behaviour of al-3%mn Alloy

Abstract

Recrystallization generally occurs at low temperatures which results in significant change in mechanical properties of the metal. In the present work Al-3% Mn alloy is prepared and subjected to plastic deformation to study the recrystallization behavior. After plastic deformation stresses are induced which are relieved by heat treatment at 600°C. The specimens are quenched after heat treatment so that alloy retains the same microstructure at room temperature as it has at high temperatures. After quenching, the specimens are subjected to recrystallization annealing at two different heat treatment temperatures (200° C & 500° C) for different holding times (5, 15, 30 & 60 minutes). The values of hardness (HRB &HRC) are calculated after recrystallization annealing for all the specimens. The recrystallization behavior is studied by microstructure examination. It is observed that rate of recrystallization increases with increase in temperature and the grain size depends upon the holding temperatures.