Tensile deformation characteristics of a nano-structured 5083 Al alloy

Abstract

The microstructure and tensile deformation characteristics in the commercial 5083 Al alloy after equal channel angular pressing (ECAP) at 373 and 473 K were investigated and compared with those of one rearmealed at 473 K for 1 h after ECAP at 373 K. AB Specimens revealed nano-structure with grains of similar to300 nm and no distinct grain boundaries except the reannealed alloy. The strength in the alloy pressed at 313 K was much higher than that of as-received alloy but the elongation to failure was significantly smaller. while. in case of pressing at 473 K. the improvement in strength was found concurrent with slight work hardening. without sacrificing much of the elongation. The tensile properties of the reannealed alloy were in between those of ones pressed at 373 and 473 K. These tensile deformation characteristics were analyzed based on the observations of deformed microstructure and fracture surface by TEM and FE-SEM. respectively. (C) 2004 Elsevier B.V. All fights reserved.