# US 10,370,743 B2 · Aluminum alloy wire, aluminum alloy twisted wire, covered wire, and wiring harness > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,370,743 B2 - Document ID: US10370743B2 - Status: Granted - Kind: B2 - Application number: 15/735,536 - Filed: 2016-05-23 - Published: 2018-06-21 - Granted: 2019-08-06 - Earliest claimed: 2015-06-12 - Assignees: Autonetworks Technologies, Ltd.; Sumitomo Wiring Systems, Ltd.; Sumitomo Electric Industries, Ltd. - Applicants: Autonetworks Technologies, Ltd.; Sumitomo Wiring Systems, Ltd.; Sumitomo Electric Industries, Ltd. - Inventors: Hiroyuki Kobayashi; Kinji Taguchi; Yasuyuki Ootsuka; Tetsuya Kuwabara; Misato Kusakari - Web page: https://patentgrep.com/patent/US10370743B2 ## CPC - C22C 21/08: with silicon - C22C 21/00: Alloys based on aluminium - C22F 1/05: of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions - H01B 1/02: mainly consisting of metals or alloys - H01B 1/023: {Alloys based on aluminium} - H01B 5/02: Single bars, rods, wires, or strips - H01B 7/00: Insulated conductors or cables characterised by their form - C22F 1/00: Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working (apparatus for mechanical working of metal B21, B23, B24) - C22F 1/04: of aluminium or alloys based thereon - H01B 7/02: Disposition of insulation - C22C: ALLOYS (treatment of alloys C21D, C22F) - C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00) - H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K}) ## Abstract An aluminum alloy wire, an aluminum alloy twisted wire, a covered wire, and a wiring harness, which are excellent in impact strength when a terminal fitting is connected. An aluminum alloy wire contains 0.03% or more and 1.5% or less by mass of Mg, 0.02% or more and 2.0% or less by mass of Si, and 0.1% or more and 0.6% or less by mass of Fe, with the balance consisting of Al and impurities; the wire containing acicular-shaped Mg2Si precipitates of 2.0 to 6.0 in aspect ratio. Further, provided are an aluminum alloy twisted wire containing a plurality of the aluminum alloy wires; a covered wire containing a conductor containing the aluminum alloy wire, and an insulation coating covering the outer circumference of the conductor; and a wiring harness containing a terminal fitting attached to the conductor of the covered wire. ## Claims ### Claim 1 An aluminum alloy wire comprising: 0.03% or more and 1.5% or less by mass of Mg; 0.02% or more and 2.0% or less by mass of Si; 0.1% or more and 0.3% or less by mass of Fe; and 0.01% or more and 0.05% or less by mass Zr, with the balance consisting of Al and impurities, the wire comprising acicular-shaped Mg2Si precipitates of 2.0 to 6.0 in aspect ratio and lengths less than 40 nm, and having an elongation of 5% or higher, and wherein a number of the Mg2Si precipitates having grain diameters of 5 to 50 nm is 100 or more in an area of 350 nm×425 nm on a cross section in a radial direction of the wire. ### Claim 2 (depends on 1) The aluminum alloy wire according to claim 1, further comprising 0.016% or less by mass of B. ### Claim 3 (depends on 1) The aluminum alloy wire according to claim 1, further comprising 0.08% or less by mass of Ti. ### Claim 4 (depends on 3) The aluminum alloy wire according to claim 3, further comprising 0.016% or less by mass of B. ### Claim 5 (depends on 1) The aluminum alloy wire according to claim 1, wherein the aluminum alloy wire has a dislocation density of 5.0×109 cm−2 or less. ### Claim 6 (depends on 1) The aluminum alloy wire according to claim 1, wherein the Mg2Si precipitates are oriented in an axial direction of the wire. ### Claim 7 (depends on 1) The aluminum alloy wire according to claim 1, wherein the aluminum alloy wire has a tensile strength of 150 MPa or higher. ### Claim 8 (depends on 1) The aluminum alloy wire according to claim 1, wherein the aluminum alloy wire has an electric conductivity of 40% IACS or higher. ### Claim 9 (depends on 1) The aluminum alloy wire according to claim 1, wherein the aluminum alloy wire has a diameter of 0.5 mm or less. ### Claim 10 (depends on 1) The aluminum alloy wire according to claim 1, wherein the aluminum alloy wire has an impact resistance of 150 g or more, where the impact resistance is defined as a maximum load at which a sample comprising a conductor consisting of 19 pieces of the aluminum alloy wire of a diameter of 0.155 mm bundled and twisted together at a twist pitch of 16 mm and a terminal fitting crimped to an end of the conductor at a crimping part does not break at the crimping part when the load attached to the other end of the conductor is pulled up to the height where the terminal fitting is fixed, and falls freely. ### Claim 11 (depends on 1) The aluminum alloy wire according to claim 1, wherein the number of Mg2Si precipitates exceeding 50 nm in grain diameter is 50 or less in an area of 16 μm×6.8 μm on a cross section in a radial direction of the wire. ### Claim 12 (depends on 1) An aluminum alloy twisted wire comprising a plurality of the aluminum alloy wires according to claim 1, twisted together. ### Claim 13 (depends on 12) The aluminum alloy twisted wire according to claim 12, compressed in a radial direction. ### Claim 14 (depends on 1) A covered wire comprising: a conductor comprising the aluminum alloy wire according to claim 1; and an insulation coating covering the outer circumference of the conductor. ### Claim 15 (depends on 14) A wiring harness comprising: the covered wire according to claim 14; and a terminal fitting attached to the conductor of the covered wire. ### Claim 16 (depends on 1) The aluminum alloy twisted wire according to claim 1, wherein the aspect ratio of the acicular-shaped Mg2Si precipitates is from 4.0 to 6.0.