High-strength heat-resistant aluminum alloy, conductive wire, overhead wire and method of preparing high-strength heat-resistant aluminum alloy

摘要

An aluminum alloy having high tensile strength and high conductivity with excellent heat resistance is provided. The aluminum alloy contains 0.28 to 0.80 percent by weight of zirconium, 0.10 to 0.80 percent by weight of manganese and 0.10 to 0.40 percent by weight of copper. Further, the aluminum alloy preferably contains 0.16 to 0.30 percent by weight of silicon. A conductive wire or an overhead wire can be prepared by twisting wires consisting of this aluminum alloy. A method of preparing the aluminum alloy comprises the steps of casting a raw material containing 0.28 to 0.80 percent by weight of zirconium, 0.10 to 0.80 percent by weight of manganese and 0.10 to 0.40 percent by weight of copper with a rest consisting of aluminum at a temperature of at least ä750 + 227 x (Z - 0.28)ü DEG C, where Z represents the content of zirconium in weight percentage, and thereafter cooling the same at a cooling rate of at least 0.16 DEG C/sec., thereby forming cast aluminum, hot-working the cast aluminum thereby forming a primary aluminum alloy, heat-treating the primary aluminum alloy thereby forming a secondary aluminum alloy, and cold-working the secondary aluminum alloy. IMAGE