玻璃包覆纯铜微丝的力学性能

Mechanical properties of glass-coated pure copper micro-wires

以实验室制备的玻璃包覆纯铜微丝为研究对象,对玻璃包覆纯铜微丝及去除包覆层的纯铜芯丝进行了力学性能评价和断口形貌分析.结果表明:外径45μm、包覆层厚度7.5μm和外径27μm、包覆层厚度6.0μm的玻璃包覆纯铜微丝极限拉伸载荷分别为0.268N和0.237N;纯铜芯丝的拉伸应力应变曲线表现出较低的加工硬化率,屈服强度与抗拉强度比值在0.75以上;纯铜芯丝抗拉强度随直径的减小而增大;直径10μm芯丝的平均抗拉强度可达547.9 MPa,延伸率约为2.5%;芯丝断裂模式为滑移延伸断裂.

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.