Method of manufacturing aluminum alloy wire, method of manufacturing electric wire and method of manufacturing wire harness using the same

A method of manufacturing an aluminum alloy wire, comprising:

• forming a rough drawing wire composed of an aluminum alloy, the aluminum alloy consisting of aluminum and additive elements, the additive elements consisting of:
• Si in an amount of 0.35 mass % to 0.75 mass %;
• Mg in an amount of 0.3 mass % to 0.7 mass %;
• V in an amount of 0.002 mass % or more;
• optionally Cu in an amount of 0.4 mass % or less;
• optionally Fe in an amount of 0.6 mass % or less;
• optionally Ti and/or B, wherein a total content of Ti and B is mass % or less;
• and unavoidable impurities;
• obtaining an aluminum alloy wire by performing a treatment on the rough drawing wire, wherein the treatment comprises a first wire drawing treatment of obtaining a drawn wire material obtained by drawing the rough drawing wire, a second wire drawing treatment, and a third wire drawing treatment;
• performing a normal heat treatment of the drawn wire material at a temperature of 100° C. to 400° C., after the first wire drawing treatment and before the second wire drawing treatment;
• a first solution treatment that forms a first solution treatment material by forming a solid solution of the aluminum and the additive elements and then performing a quenching treatment on the solid solution, wherein the first solution treatment is performed after the second wire drawing treatment and directly before the third wire drawing treatment is performed;
• a second solution treatment that forms a second solution treatment material by forming a solid solution of the aluminum and the additive elements and then performing a quenching treatment on the solid solution, wherein the second solution treatment is performed directly after the third wire drawing treatment is performed, and wherein the formation of the solid solution is performed for 10 minutes or less;
• and
• an aging treatment performed after the second solution treatment.