# US 10,246,762 B2 · Aluminum alloy electric wire and automotive wire harness using the same

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- Number: US 10,246,762 B2
- Document ID: US10246762B2
- Status: Granted
- Kind: B2
- Application number: 15/615,886
- Filed: 2017-06-07
- Published: 2017-12-14
- Granted: 2019-04-02
- Earliest claimed: 2016-06-09
- Assignees: Yazaki Corporation
- Applicants: Yazaki Corporation
- Inventors: Jundai Goto; Yuuki Yamamoto
- Web page: https://patentgrep.com/patent/US10246762B2

## CPC

- C22C 21/08: with silicon
- H01B 1/02: mainly consisting of metals or alloys
- H01B 5/02: Single bars, rods, wires, or strips
- H01B 7/0045: {Cable-harnesses}
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- 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 electric wire includes an aluminum alloy strand that contains Mg, Si and a remainder composed of aluminum and inevitable impurities. The aluminum alloy strand contains 0.6 to 1.4 atomic % of Mg and 0.2 to 1.0 atomic % of Si, has a coefficient of variation of 0.8 or less, the coefficient being calculated by dividing a standard deviation of a grain size of crystal grains observed on a cross section by an average grain size of the crystal grains, has tensile strength of 165 MPa or more, has elongation at break of 7% or more, and has conductivity of 40% IACS or more.

## Claims

### Claim 1

An aluminum alloy electric wire comprising an aluminum alloy strand that comprises magnesium (Mg), silicon (Si) and a remainder comprising of aluminum (Al) and impurities,
wherein the aluminum alloy strand comprises 0.60 to 1.4 by atomic percent of Mg and 0.2 to 1.0 by atomic percent of Si, has a coefficient of variation in a range of 0.6 to 0.8, the coefficient of variation being calculated by dividing a standard deviation of a grain size of crystal grains observed on a cross section of the aluminum alloy strand by an average grain size of the crystal grains, has tensile strength of 165 MPa or more, has elongation at break of 7 percent or more, and has conductivity of 40 percent IACS or more.

### Claim 2 (depends on 1)

An automotive wire harness, comprising the aluminum alloy electric wire according to claim 1.

### Claim 3 (depends on 1)

The aluminum alloy electric wire comprising an aluminum alloy strand according to claim 1, wherein the average grain size is in a range of 19.0 to 22.0 micrometers.

### Claim 4 (depends on 1)

The aluminum alloy electric wire comprising an aluminum alloy strand according to claim 1, wherein the elongation at break is in a range of 10.9 percent to 14.8 percent.

### Claim 5 (depends on 1)

The aluminum alloy electric wire comprising an aluminum alloy strand according to claim 1, wherein the tensile strength is in a range of 267 to 281 MPa.