A covered electrical wire including a conductor and an insulating coating layer covering the outer periphery of the conductor, in which the conductor is a twisted wire obtained by twisting together a plurality of elemental wires constituted by copper or a copper alloy, and the covered electrical wire includes a metallically bonded portion where the elemental wires that are adjacent to each other are metallically bonded to each other.

A covered electrical wire including a conductor and an insulating coating layer covering the outer periphery of the conductor, in which the conductor is a twisted wire obtained by twisting together a plurality of elemental wires constituted by copper or a copper alloy, and the covered electrical wire includes a metallically bonded portion where the elemental wires that are adjacent to each other are metallically bonded to each other.

A coated carbon nanotube wire for a coil includes: a carbon nanotube wire, the carbon nanotube wire being composed of a plurality of carbon nanotube aggregates each constituted of a plurality of carbon nanotubes, or being composed of a plurality of carbon nanotube element wires each constituted of a plurality of carbon nanotubes; and a coating layer coating the carbon nanotube wire, wherein each of the carbon nanotube aggregates contacts one or more other adjacent carbon nanotube aggregates, or each of the carbon nanotube element wires contacts one or more other adjacent carbon nanotube element wires.

A coated carbon nanotube wire for a coil includes: a carbon nanotube wire, the carbon nanotube wire being composed of a plurality of carbon nanotube aggregates each constituted of a plurality of carbon nanotubes, or being composed of a plurality of carbon nanotube element wires each constituted of a plurality of carbon nanotubes; and a coating layer coating the carbon nanotube wire, wherein each of the carbon nanotube aggregates contacts one or more other adjacent carbon nanotube aggregates, or each of the carbon nanotube element wires contacts one or more other adjacent carbon nanotube element wires.

An aluminum alloy contains equal to or more than 0.005 mass % and equal to or less than 2.2 mass % of Fe, and a remainder of Al and an inevitable impurity. In a transverse section of the aluminum alloy wire, a surface-layer void measurement region in a shape of a rectangle having a short side length of 30 m and a long side length of 50 m is defined within a surface layer region extending from a surface of the aluminum alloy wire by 30 m in a depth direction, and a total cross-sectional area of voids in the surface-layer void measurement region is equal to or less than 2 m.sup.2.

An aluminum alloy contains equal to or more than 0.005 mass % and equal to or less than 2.2 mass % of Fe, and a remainder of Al and an inevitable impurity. In a transverse section of the aluminum alloy wire, a surface-layer void measurement region in a shape of a rectangle having a short side length of 30 m and a long side length of 50 m is defined within a surface layer region extending from a surface of the aluminum alloy wire by 30 m in a depth direction, and a total cross-sectional area of voids in the surface-layer void measurement region is equal to or less than 2 m.sup.2.

A wire conductor has a plurality of elemental wires made of aluminum or an aluminum alloy, which are stranded with each other and arranged, in cross-section intersecting an axial direction of the wire conductor, in which one or a plurality of virtual elemental wires are removed from an outer peripheral portion of a virtual cross-section represented by a maximum number of virtual elemental wires accommodated in a circumscribing figure approximated by a regular hexagon, the virtual elemental wires having a same diameter as the elemental wires. The wire conductor includes a plurality of slave strands, each being a strand of the plurality of elemental wires, a maximum diameter cross-sectional area ratio is 0.63 or higher that is calculated by dividing a cross-sectional area of the wire conductor by an area of a circle having a diameter equal to a maximum value of an outer diameter of the wire conductor.

A wire conductor has a plurality of elemental wires made of aluminum or an aluminum alloy, which are stranded with each other and arranged, in cross-section intersecting an axial direction of the wire conductor, in which one or a plurality of virtual elemental wires are removed from an outer peripheral portion of a virtual cross-section represented by a maximum number of virtual elemental wires accommodated in a circumscribing figure approximated by a regular hexagon, the virtual elemental wires having a same diameter as the elemental wires. The wire conductor includes a plurality of slave strands, each being a strand of the plurality of elemental wires, a maximum diameter cross-sectional area ratio is 0.63 or higher that is calculated by dividing a cross-sectional area of the wire conductor by an area of a circle having a diameter equal to a maximum value of an outer diameter of the wire conductor.

This twisted wire conductor 10 for an insulated electrical wire is configured so as to be in a mixed state in which a first conductor 20 and a second conductor 40 are twisted together. The first conductor comprises a specific aluminum alloy: which has an alloy composition that contains, by mass %, 0.2-1.8% of Mg, 0.2-2.0% of Si, 0.01-0.33% of Fe and a total of 0.00-2.00% of one or more elements selected from the group consisting of Cu, Ag, Zn, Ni, Co, Au, Mn, Cr, V, Zr, Ti and Sn, with the remainder comprising Al and unavoidable impurities; which has a fibrous metal structure in which crystal grains extend in one direction; and in which the average value of a dimension t which is perpendicular to the longitudinal direction of crystal grains is 400 nm or less in a cross section parallel to this one direction. The second conductor has a higher electrical conductivity than the first conductor 20 and comprises a metal or alloy selected from the group consisting of copper, copper alloys, aluminum and aluminum alloys. The twisted wire conductor exhibits high electrical conductivity, high strength and excellent bending fatigue resistance, and enables a reduction in weight.

This twisted wire conductor 10 for an insulated electrical wire is configured so as to be in a mixed state in which a first conductor 20 and a second conductor 40 are twisted together. The first conductor comprises a specific aluminum alloy: which has an alloy composition that contains, by mass %, 0.2-1.8% of Mg, 0.2-2.0% of Si, 0.01-0.33% of Fe and a total of 0.00-2.00% of one or more elements selected from the group consisting of Cu, Ag, Zn, Ni, Co, Au, Mn, Cr, V, Zr, Ti and Sn, with the remainder comprising Al and unavoidable impurities; which has a fibrous metal structure in which crystal grains extend in one direction; and in which the average value of a dimension t which is perpendicular to the longitudinal direction of crystal grains is 400 nm or less in a cross section parallel to this one direction. The second conductor has a higher electrical conductivity than the first conductor 20 and comprises a metal or alloy selected from the group consisting of copper, copper alloys, aluminum and aluminum alloys. The twisted wire conductor exhibits high electrical conductivity, high strength and excellent bending fatigue resistance, and enables a reduction in weight.