INVESTIGATION ON THE RECRYSTALLIZATION BEHAVIOR OF COLD DEFORMED MP159 ALLOY

The recrystallization behaviour of cold drawn MP159 alloy was investig ated by optical and TEM examinations. It is found that the platelet ep silon phase in the MP alloy inhibits the recrystallization, and this e ffect makes the MP159 alloy with high recrystallization temperature of about 920 degrees C. This inhibition mainly comes from the increasing of the interfacial energy, which results from the change of the coher ent interfaces of (0001)(hcp)//(111)(fcc) into the incoherent interfac es when the recrystallizing grain fronts bypass the platelet epsilon m artensite. The increasing of the interfacial energy also causes the di ssolution of a few segments on the epsilon martensite platelets, which decreases the strength of the MP alloy.