Effect of Conform Process on Evolution of Microstructure and Properties of Al-0.5Fe Alloy
There are many hard primary phases in Al-Fe alloy,which are prone to stress concentra-tion during deformation,leading to alloy fracture and significantly increasing the wire breakage rate of alu-minum alloy wires.In order to break down the primary secondary phase in the alloy and refine the micro-structure of the alloy,this paper introduces the so-called"Conform process"i.e.continuous extrusion pro-cess in the preparation of Al-0.5Fe alloy wires.Correspondingly the evolution of the microstructure and properties of Al-0.5Fe alloy were characterized by means of scanning electron microscopy(SEM),elec-tron backscatter diffraction(EBSD),transmission electron microscopy(TEM)and tensile testing machine.The results showed that after 1st pass,the tensile strength and EC of the alloy increased simultaneously,with the tensile strength increasing from 76.3 MPa to 90.2 MPa and the electric conductivity(EC)increas-ing from 62.0％IACS to 62.3％IACS;With the increase of conform passes,the tensile strength,EC,and equivalent size of the primary phase all show a decreasing trend.After 4th pass,the tensile strength de-creases to 78.4 MPa,the EC decreases to 61.95％IACS,and the equivalent size of the primary phase decreases to 0.31 μm.Through comparative analysis of the microstructures,it was found that with the in-crease of Conform passes,the decrease of EC may be ascribed to the gradual decrease in size and area fraction of the secondary phase.
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