Model describing grain size evolution of selected copped alloys during and after deformation

摘要

In the paper the mathematical models describing grain size evolution of selected copper alloys caused by dynamic, static and metadynamic recrystallizations as well as grain growth were prersented. Evolution of grain size caused by dynamic and metadynamic recrystallization is function of Zener-Hollomon parameter, constant parameter A in Garafalo equation and two material constants. Evolution of grain size caused by static recrystallization is function of Zener-Hollomon parameter, initial grain size, degree of deformation and three material constants. Grain growth is described by activation energy of steady-state flow, temperature, time, grain size at the beginning of grain growth process and two material constants. All parameters describing grain size evolution were determined by using torsion test and structural investigation.