Precipitation Effect On Work Hardening Behavior Of ECAP-Deformed Al-4Cu Alloy

摘要

It is well known that severe plastic deformation techniques, while giving substantial strength benefits, produce low ductility material. The aim of the present work is to analyze whether second phase precipitates obtained by post-deformation heat treatment, have a positive effect on the W-H behavior. On this sense, the typical precipitation hardening Al-4%Cu alloy is subjected to one and four ECAP passes, followed by low temperature precipitation heat treatment. The W-H behavior and the mechanical stability were determined for two levels of ECAP - deformation, different precipitates average size and distribution, and presence/absence of solute in solid solution. It was concluded that Al_2Cu precipitates increased both W-H rate and uniform elongation of the alloy and the best strength - ductility combination was obtained by a post-deformation, 100℃ precipitation heat treatment of a sample which was ECAP-deformed in the solid solution condition.