Effects of Thermomechanical Treatment on Microstructure and Properties of 7075 alu-minum Alloy Wire Prepared by Continuous Rheological Extrusion
Microstructure and properties of 7075 aluminum alloy wire prepared by continuous rheological extrusion were controlled by thermomechanical treatment.Effects of processes on microstructure and properties of 7075 alumi-num alloy wire by continuous rheological extrusion were investigated by metallographic microscope,scanning electron microscope and X-ray diffractometer.The results indicate that the second phase on Al matrix is gradually decreased after solution treatment at 470℃for 90 min,and a small amount of θ phase is distributed at the grain boundaries.With the increase of section reduction,the second phase is dispersed on the Al matrix,and η phase is continuously precipi-tated with white elongated dispersion.The two-stage aging treatment of 120℃×4 h+160℃×13 h was carried out on the wire with the diameter of wire reaching 4 mm,and the drawing continued,until the diameter of wire reaches 3 mm,where the elongation is reduced slightly,and tensile strength reaches 530.95 MPa.
Continuous Rheological ExtrusionThermomechanical TreatmentMicrostructure and Properties
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