GRAIN-STRUCTURE STABILITY CRITERION IN PRECIPITATION-HARDENED ALLOYS DURING PRIMARY RECRYSTALLIZATION

摘要

A grain-structure stability criterion in precipitation-hardened alloys (PHAs) during primary recrystallization based on equality of the velocities of the grain boundary (GB) and particles during their joint migration and taking into account the GB curvature between particles was obtained. The condition found makes it possible to qualitatively explain the known experimental dependences of the stability of the GB-particle complex on the volume proportion and size of particles as well as on the ratio of mobilities of particles and GB. It is shown that the last factor has a substantial effect on grain-structure stability in PHAs during movement of the particles by the volume flow mechanism.