The Enrichment Of (Cu, Sn) Solid Solution Driven By High-Pressure Torsion

Cu-14 wt% Sn alloy was annealed at temperatures of 320 and 500 degrees C. The concentration of tin c(init) in the copper-based matrix increased with annealing temperature. The annealed samples were subjected to high-pressure torsion (HPT) at 6 GPa, 5 turns, 1 rpa. HPT led to the refinement of Cu grains. The shape of the colonies of alpha + epsilon phases changed only slightly. The HPT-driven enrichment of the Cu-based solid solution with Sn atoms c(HPT)-c(init) decreased with increasing c(init). The performed theoretical analysis explained this behavior of the HPT-driven enrichment.