A new type of Cu-Sn-Ti-B alloy wire was designed by horizontal continuous casting-cold rolling and drawing.The effects of cold deformation and isothermal annealing on microstructure and properties of the alloy prepared were investigated by means of optical microscopy

scanning electron microscopy

hardness testing

electrical conductivity and tensile testing.The results show that the microstructure of the as-cast alloy is large bulkyαmatrix phase with a length of millimeters

after the cold working

the distortion of the crystal grains is obviously elongated.When the lead speed is 230 mm·min

-1

the as-cast alloy rod presents the desirable mechanical properties

where tensile strength and elongation reach 186 MPa and 44%

respectively.In addition

the alloy wire with φ3 mm is subjected to isothermal annealing at 400～500 ℃for 100 min

resulting in recrystallization in the alloy and refinement of the grains.After isothermal annealing for the alloy at different temperatures

it is found that a certain precipitation behavior can be observed in solid solution of the alloy.Meanwhile

after annealing at 400～500 ℃for 100 min

the alloy wire has a maximum electrical conductivity of 48.314 MS/m.The Cu-Sn-Ti-B alloy wire with a diameter of 1 mm has excellent performance with strength of 550 MPa and conductivity of 47.56 MS/m

which was drawn by the alloy wire with φ3 mm annealed at 500 ℃ for 100 min.