Mechanical properties of glass-coated pure copper micro-wires

Glass-coated pure copper micro-wires were fabricated by the melting spinning method. The mechanical properties of both glass-coated pure copper micro-wires and pure copper fibers were evaluated and the fracture morphology was observed, The results show that the ultimate tensile load of the glass-coated pure copper micro-wire with 45 μm in diameter and 7.5 μm in thickness of glass layer is 0.268 N, and the load of the micro-wire with 27 μm in diameter and 6.0 μm in thickness of glass layer is 0.237 N. The tensile stress-strain curves of pure copper fibers exhibit low work hardening rate. The ratio of yield strength to tensile strength is above 0.75. The tensile strength of pure copper fibers increases with the diameter of copper fibers decreasing. The average tensile strength of the copper fiber with 10μm in diameter is 547.9 MPa and the elongation is about 2.5%.The tensile fracture mode of pure copper fibers is slip-elongation rupture.