Study On Composition Optimization And Microstructure And Properties Of Al-0.7Fe-0.1Si Series Aluminum Alloy Wire

8xxx aluminum alloy wire,with good electrical conductivity,mechanical properties and excellent application value,has been widely used in wire and cable transmission lines,meanwhile research into 8xxx aluminum alloy has become increasingly important.This paper aims at developing a micro-alloyed 8xxx alloy wire according to findings of researches on conductive wire 8076 aluminum alloy as well as composition design,forming and heat treatment.In order to further improve the conductivity of the alloy,the effect of adding rare earth element Er on the structure and properties of the alloy was studied.The content of Mg element was increased by adding the content of Er element,and the change of structure and properties was further explored;Systematical measures were taken to study the effect of the drawing process on the micro-structure and properties of the alloy wire in order to design the best drawing procedure;Also,the influence of the heat treatment on the micro-structure and properties of the alloy wire was studied,and a reasonable heat treatment process was determined.The results of adding rare earth element Er demonstrate that when the rare earth element Er is added to the alloy,the Er element reacts with the matrix to precipitate particles of second phase Al3 Er,which refines the alloy structure and improves the electrical properties of the alloy,but barely change the mechanical properties of the alloy,throwing light upon the impossibility of increasing of mechanical properties and electrical properties of the alloy at the same time.Therefore,when the content of Er element is kept constant,the content of Mg element is increased.The result shows that the addition of Mg element content,with other alloying elements of the matrix precipitation compounds,making the alloy dispersion strengthening,so that the mechanical properties of the alloy increased,and little impact on the electrical properties,when electrical properties and mechanical properties of alloy both can achieve the national standard performance standards for conductive materials.Consequences of the drawing process indicate that the optimum figures of drawing process are annealed wires of ?6.40mm/330?,conductivity of 61.34%IACS,tensile strength of 270.92 MPa,and an elongation of 10.02%.The results of the annealing process show that the conductivity arrive at a peak of 61.88%IACS,tensile strength reaches280.56 MPa with an elongation of 10.36% after the cold drawn wire annealed at 330? for5 h and furnace cooling.It also makes a difference to alloy performance if various cooling methods after wire annealing are applied.Study shows that better performance was observed in the furnace cooling method than in the air cooling.The results show that the conductivity and elongation of the two-stage aging are obviously higher than that of the single-stage aging.The cold drawn wire is quenched by 480?×1h+180?×10h+100?×12h,the maximum performance of wire,the conductivity of 60.16%IACS,tensile strength of 204.32 MPa,elongation of 13.21%,and two-stage aging treatment than single-stage aging,conductivity and elongation increased,the tensile strength does not change much.