MODELING MATRIX GRAIN-GROWTH IN THE PRESENCE OF GROWING 2ND PHASE PARTICLES IN 2 PHASE ALLOYS

In a number of two phase systems such as in α-β titanium alloys, second phase particles as well as the matrix grains grow simultaneously. A systematic study has been undertaken to understand matrix grain growth behavior of such materials in the presence of growing second-phase particles. Using the classical expressions of the driving force for grain growth and a modified form of the Zener retardation to account for preferential location of particles at triple junctions, grain growth of α and β matrices in the presence of growing second phase particles have been modeled by first order nonlinear differential equations. The contributions of grain boundary curvature, nonspherical nature of particles and nonorthogonal nature of particle grain boundary contact angles have also been incorporated into these models. Matrix grain sizes predicted by these methods were found to correlate well with the experimental results. © 1990.