Aluminum alloy wire, aluminum alloy stranded wire, covered electric wire, and wire harness

Patent metadata

Field	Value
Publication number	US-10418142-B2
Application number	US-201816236744-A
Country	US
Kind code	B2
Filing date	Dec 31, 2018
Priority date	Jul 13, 2016
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

The present disclosure provides an aluminum alloy wire or the like which can secure a high conductivity and a moderately low yield strength, and realize both a high elongation and a moderate tensile strength.
An aluminum alloy wire of the present disclosure contains 0.10 to 1.00% by mass of Mg, 0.10 to 1.20% by mass of Si, 0.10 to 1.40% by mass of Fe, 0 to 0.10% by mass of Ti, 0 to 0.030% by mass of B, 0 to 1.00% by mass of Cu, 0 to 1.00% by mass of Mn, 0 to 1.00% by mass of Cr, 0 to 0.50% by mass of Zr, and 0 to 0.50% by mass of Ni, the balance being Al and 0.30% by mass or less of impurities. Coarse crystal grains are present in a vertical cross-sectional structure of the wire taken in a lengthwise direction of the wire. The greatest grain size of the coarse crystal grains as measured in the lengthwise direction of the wire is equal to or greater than a diameter of the wire. A proportion of an area of the coarse crystal grains to the total of the areas of all the crystal grains within a range of the vertical cross-sectional structure in which the vertical cross-sectional structure is measured, is 50% or more. Elongation of the wire is 10% or more.

First claim

The invention claimed is:

1. An aluminum alloy wire having a chemical composition comprising 0.10 to 1.00% by mass of Mg, 0.10 to 1.20% by mass of Si, 0.10 to 1.40% by mass of Fe, 0 to 0.10% by mass of Ti, 0 to 0.030% by mass of B, 0 to 1.00% by mass of Cu, 0 to 1.00% by mass of Mn, 0 to 1.00% by mass of Cr, 0 to 0.50% by mass of Zr, and 0 to 0.50% by mass of Ni, the balance being Al and 0.30% by mass or less of impurities,
wherein:
coarse crystal grains are present in a vertical cross-sectional structure of the wire taken in a lengthwise direction of the wire;
the greatest grain size of the coarse crystal grains as measured in the lengthwise direction of the wire is equal to or greater than a diameter of the wire;
a proportion of an area of the coarse crystal grains to the total of the areas of all the crystal grains within a range of the vertical cross-sectional structure in which the vertical cross-sectional structure is measured, is 50% or more; and
elongation of the wire is 10% or more.

2. The aluminum alloy wire according to claim 1 , wherein a dispersion density of a Mg—Si-based compound having the maximum dimension of 1 μm or less in the vertical cross-sectional structure is 0.1 grain/μm 2 or more on average.

3. The aluminum alloy wire according to claim 2 ,
wherein:
a film thickness of an oxide layer formed on a surface of the wire is 500 nm or less;
a concentration of each of Mg and Si other than a compound in the vertical cross-sectional structure is 2.0% by mass or less; and
the elongation is 15% or more, 0.2% yield strength is 200 MPa or less, and tension strength is 120 MPa or more.

4. The aluminum alloy wire according to claim 2 ,
wherein:
the proportion of the area of the coarse crystal grains is 70% or more; and
the elongation is 20% or more, 0.2% yield strength is 150 MPa or less, and tension strength is 120 MPa or more.

5. The aluminum alloy wire according to claim 2 , wherein the chemical composition contains one or two selected from the group consisting of 0.001 to 0.100% by mass of Ti and 0.001 to 0.030% by mass of B.

6. The aluminum alloy wire according to claim 2 , wherein the chemical composition contains one or two selected from the group consisting of 0.01 to 1.00% by mass of Cu, 0.01 to 1.00% by mass of Mn, 0.01 to 1.00% by mass of Cr, 0.01 to 0.50% by mass of Zr, and 0.01 to 0.50% by mass of Ni.

7. The aluminum alloy wire according to claim 1 ,
wherein:
a film thickness of an oxide layer formed on a surface of the wire is 500 nm or less;
a concentration of each of Mg and Si other than a compound in the vertical cross-sectional structure is 2.0% by mass or less; and
the elongation is 15% or more, 0.2% yield strength is 200 MPa or less, and tension strength is 120 MPa or more.

8. The aluminum alloy wire according to claim 7 ,
wherein:
the proportion of the area of the coarse crystal grains is 70% or more; and
the elongation is 20% or more, 0.2% yield strength is 150 MPa or less, and tension strength is 120 MPa or more.

9. The aluminum alloy wire according to claim 7 , wherein the chemical composition contains one or two selected from the group consisting of 0.001 to 0.100% by mass of Ti and 0.001 to 0.030% by mass of B.

10. The aluminum alloy wire according to claim 7 , wherein the chemical composition contains one or two selected from the group consisting of 0.01 to 1.00% by mass of Cu, 0.01 to 1.00% by mass of Mn, 0.01 to 1.00% by mass of Cr, 0.01 to 0.50% by mass of Zr, and 0.01 to 0.50% by mass of Ni.

11. The aluminum alloy wire according to claim 1 ,
wherein:
the proportion of the area of the coarse crystal grains is 70% or more; and
the elongation is 20% or more, 0.2% yield strength is 150 MPa or less, and tension strength is 120 MPa or more.

12. The aluminum alloy wire according to claim 11 , wherein the chemical composition contains one or two selected from the group consisting of 0.001 to 0.100% by mass of Ti and 0.001 to 0.030% by mass of B.

13. The aluminum alloy wire according to claim 11 , wherein the chemical composition contains one or two selected from the group consisting of 0.01 to 1.00% by mass of Cu, 0.01 to 1.00% by mass of Mn, 0.01 to 1.00% by mass of Cr, 0.01 to 0.50% by mass of Zr, and 0.01 to 0.50% by mass of Ni.

14. The aluminum alloy wire according to claim 1 , wherein the chemical composition contains one or two selected from the group consisting of 0.001 to 0.100% by mass of Ti and 0.001 to 0.030% by mass of B.

15. The aluminum alloy wire according to claim 1 , wherein the chemical composition contains one or two selected from the group consisting of 0.01 to 1.00% by mass of Cu, 0.01 to 1.00% by mass of Mn, 0.01 to 1.00% by mass of Cr, 0.01 to 0.50% by mass of Zr, and 0.01 to 0.50% by mass of Ni.

16. The aluminum alloy wire according to claim 1 , wherein a total of contents of Fe, Ti, B, Cu, Mn, Cr, Zr, and Ni is 0.10 to 2.00% by mass.

17. The aluminum alloy wire according to claim 1 , wherein a diameter of a strand is 0.1 to 0.5 mm.

18. An aluminum alloy stranded wire obtained by stranding a plurality of the aluminum alloy wires according to claim 1 .

19. A covered electric wire comprising a covering layer at an outer periphery of the aluminum alloy wire according to claim 1 .

20. A wire harness comprising:
the covered electric wire according to claim 19 ; and
a terminal fitted at an end portion of the covered electric wire, the covering layer being removed from the end portion.

Assignees

• Furukawa Electric Co Ltd
• Furukawa Automotive Systems Inc

Inventors

• Yoshida Sho
• Mitose Kengo
• Sekiya Shigeki

Classifications

• H01R4/18

  by crimping {(H01R4/01, H01R4/2495 take precedence; for coaxial cables H01R9/0518)} · CPC title

• C22C21/00

  Alloys based on aluminium · CPC title

• C22F1/00

  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) · CPC title

• H01B5/02

  Single bars, rods, wires, or strips · CPC title

• C22C21/02 Primary

  with silicon as the next major constituent · CPC title