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.

An aluminum alloy wire composed of an aluminum alloy, wherein the aluminum alloy contains more than or equal to 0.03 mass % and less than or equal to 1.5 mass % of Mg, more than or equal to 0.02 mass % and less than or equal to 2.0 mass % of Si, and a remainder of Al and an inevitable impurity, Mg/Si being more than or equal to 0.5 and less than or equal to 3.5 in mass ratio, and the aluminum alloy wire has a dynamic friction coefficient of less than or equal to 0.8.

A metal wiring suitable for a substrate of large size is provided. The present invention is characterized in that at least one layer of conductive film is formed on an insulating surface, a resist pattern is formed on the conductive film, and the conductive film having the resist pattern is etched to form a metal wiring while controlling its taper angle in accordance with the bias power density, the ICP power density, the temperature of lower electrode, the pressure, the total flow rate of etching gas, or the ratio of oxygen or chlorine in etching gas. The thus formed metal wiring has less fluctuation in width or length and can satisfactorily deal with an increase in size of substrate.

A method for forming a multilayer composite structure comprises providing a first sheet comprising a copper-comprising layer sandwiched by first and second graphene layers, wrapping the first sheet to form a first rod, and compacting the first rod to form a first multilayer composite structure.

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.

An electric wire conductor having both flexibility and a space-saving property, a covered electric wire, and a wiring harness containing such an electric wire conductor. The electric wire conductor contains a plurality of elemental wires twisted together, and has a non-circular portion in which a cross section intersecting an axial direction of the wire strand has a non-circular shape. The cross section of the non-circular portion has a continuous vacancy capable of accommodating two or more of the elemental wires. Further, a covered electric wire contains the electric wire conductor and an insulator covering the electric wire conductor. Furthermore, a wiring harness contains the covered electric wire.

An electric wire conductor capable of achieving both flexibility and a space-saving property, a covered electric wire and a wiring harness including such an electric wire conductor. The electric wire conductor contains a wire strand containing a plurality of elemental wires twisted together, and has a flat portion where a cross-section intersecting an axial direction of the wire strand has a flat shape. A covered electric wire contains the electric wire conductors and an insulator covering the electric wire conductors. A wiring harness contains such covered electric wires.

An aluminum alloy wire composed of an aluminum alloy, wherein the aluminum alloy contains more than or equal to 0.03 mass % and less than or equal to 1.5 mass % of Mg, more than or equal to 0.02 mass % and less than or equal to 2.0 mass % of Si, and a remainder of Al and an inevitable impurity, Mg/Si being more than or equal to 0.5 and less than or equal to 3.5 in mass ratio, and the aluminum alloy wire has a dynamic friction coefficient of less than or equal to 0.8.

Provided are an electric wire conductor having both flexibility and a space-saving property, a covered electric wire, and a wiring harness containing such an electric wire conductor. The electric wire conductor contains a plurality of elemental wires, and has a flat portion in which a cross-section intersecting an axial direction of the wire strand has a flat shape. Deformation ratios of the elemental wires at peripheral end parts in a width direction are 70% or lower of deformation ratios of the elemental wires at center parts. Further, a covered electric wire contains the electric wire conductor and an insulator covering the electric wire conductor.

A multi-core power cable for supplying AC power to an electrical device, the multi-core power cable including a plurality of core wires that are non-insulated stranded wires or non-insulated single-core wires; an insulative Y-shaped spacer that includes a center that is a solid portion that is made of an insulative resin and that extends in a longitudinal direction, and three plate-shaped walls that are formed of an insulative resin and that extend outward in a radial direction from the center, and that are provided between the plurality of core wires and isolates the plurality of core wires from each other, the spacer being configured to position the plurality of core wires in a trefoil formation; and an insulative sheath that collectively covers an outside of the plurality of core wires.