Effects of Extrusion Ratio on Microstructure and Tensile Properties of an Extruded Al-Fe-Cu Alloy

The effects of extrusion ratio on microstructure and tensile properties of Al-0.7Fe-0.2Cu-0.02 B aluminum alloy bars which were produced by hot extrusion were studied.The results show that dynamic recrystallization occurred during hot extrusion,with the increase of the extrusion ratio,the recrystallization grains became smaller and more uniform distribution.After extrusion,the second phase Al6 Fe transformed into Al3 Fe,and the Al3 Fe phase became small gradually and gathered at the grain boundaries with the increase of extrusion ratio.With the increase of extrusion ratio from 6to 28,the tensile strength increased from 106.53 MPa to122.67 MPa and the yield strength increased from 78.88 MPa to 84.65 MPa.The relationship between yield strengthσ0.2and mean grains size dof the extruded alloy obtained by data fitting wasσ0.2=63.8+77d-1/2.