Study on the effect of annealing and solution treatment on the peripheral coarse grain of 2195 alloy

Abstract

In the actual production process, some aluminum alloys need to go through annealing heat treatment followed by solution treatment; this paper explores the evolution of peripheral coarse grain (PCG) structure during annealing and solution treatment by metallographic observation and electron back-scattered diffraction (EBSD) of materials in the extruded state, after different annealing heat treatments and different solution treatments. It was found that recrystallization occurred in the surface layer of the material during the extrusion process, and the recrystallized grains developed into PCG during the solution process. The PCG was smaller when the annealing temperature was too low, or the solution temperature was too high, but the PCG structure was thicker. The annealing time had no significant effect on the PCG structure. The coarse grains appeared first at the edge of the material and then engulfed each other to develop into several huge grains.