Microstructure evolution during grain growth in materials with disperse particles

Abstract Numerical simulations of grain growth are carried out on micro-grained polycrystals containing different volume fractions f of particles of radius r . It was supposed that particles are distributed randomly and do not change their size with time. Particles promote abnormal grain growth; this process is not completed and results in formation of duplex microstructure. Disposition to abnormal growth at first increases and then reduces with an increase in f , the latter being especially noticeable at f > r/D 0 where D 0 is the initial grain diameter. Limiting grain size is found to be equal to ~0.4 r/f .