Aluminum alloy wire rod, aluminum alloy stranded wire, covered wire, and wire harness, and method of manufacturing aluminum alloy wire rod

A wire harness comprising:

• a covered wire including a covering layer at an outer periphery of one of an aluminum alloy wire rod and an aluminum alloy stranded wire;
• and
• a terminal fitted at an end portion of the covered wire, the covering layer being removed from the end portion,
• wherein the aluminum alloy wire rod had a composition comprising Mg:
• 0.1 mass % to 1.0 mass %, Si:
• 0.1 mass % to 1.2 mass %, Fe:
• 0.10 mass % to 1.40 mass %, Ti:
• 0 mass % to 0.100 mass %, B:
• 0 mass % to 0.030 mass %, Cu:
• 0 mass % to 1.00 mass %, Ag:
• 0 mass % to 0.50 mass %, Au:
• 0 mass % to 0.50 mass %, Mn:
• 0 mass % to 1.00 mass %, Cr:
• 0 mass % to 1.00 mass %, Zr:
• 0 mass % to 0.50 mass %, Hf:
• 0 mass % to 0.50 mass %, V:
• 0 mass % to 0.50 mass %, Sc:
• 0 mass % to 0.50 mass %, Co:
• 0 mass % to 0.50 mass %, Ni:
• 0 mass % to 0.50 mass %, and the balance:
• Al and inevitable impurities,
• wherein a number of compound particles present on a surface and having a diameter of greater than or equal to 1 μm in terms of equivalent circle diameter is less than or equal to one per 100 μm2, and a tensile strength is greater than or equal to 200 MPa.

A method of manufacturing an aluminum alloy wire rod comprising:

• forming a drawing stock through hot working subsequent to melting and casting an aluminum alloy material having a composition comprising Mg:
• 0.1 mass % to 1.0 mass %, Si:
• 0.1 mass % to 1.2 mass %, Fe:
• 0.10 mass % to 1.40 mass %, Ti:
• 0 mass % to 0.100 mass %, B:
• 0 mass % to 0.030 mass %, Cu:
• 0 mass % to 1.00 mass %, Ag:
• 0 mass % to 0.50 mass %, Au:
• 0 mass % to 0.50 mass %, Mn:
• 0 mass % to 1.00 mass %, Cr:
• 0 mass % to 1.00 mass %, Zr:
• 0 mass % to 0.50 mass %, Hf:
• 0 mass % to 0.50 mass %, V:
• 0 mass % to 0.50 mass %, Sc:
• 0 mass % to 0.50 mass %, Co:
• 0 mass % to 0.50 mass %, Ni:
• 0 mass % to 0.50 mass %, and the balance:
• Al and inevitable impurities;
• and
• subsequently, performing steps including at least a wire drawing step, an solution heat treatment and an aging heat treatment,
• wherein the solution heat treatment includes heating to a predetermined temperature in range of 450° C. to 580° C., retaining at the predetermined temperature for a predetermined time, and thereafter cooling at an average cooling rate of greater than or equal to 10° C./s to at least a temperature of 150° C.;
• and
• the aging heat treatment is performed at a predetermined temperature in a range of 20° C. to 250° C.