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.
关键词
连续流变挤压/形变热处理/组织性能
Key words
Continuous Rheological Extrusion/Thermomechanical Treatment/Microstructure and Properties
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