Aluminum alloy wire, aluminum alloy strand wire, covered electrical wire, and terminal-equipped electrical wire

Patent metadata

Field	Value
Publication number	US-10706986-B2
Application number	US-201916674015-A
Country	US
Kind code	B2
Filing date	Nov 5, 2019
Priority date	Oct 31, 2016
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

An aluminum alloy wire is composed of an aluminum alloy. The 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 crystallization measurement region in a shape of a rectangle having a short side length of 50 μm and a long side length of 75 μm is defined within a surface layer region extending from a surface of the aluminum alloy wire by 50 μm in a depth direction, and an average area of crystallized materials in the surface-layer crystallization measurement region is equal to or more than 0.05 μm2 and equal to or less than 3 μm2.

First claim

The invention claimed is:

1. An aluminum alloy wire composed of an aluminum alloy, wherein
the aluminum alloy contains equal to or more than 0.005 mass % and equal to or less than 2.2 mass % of Fe, equal to or more than 0 mass % and equal to or less than 1.0 mass % in total of one or more of elements selected from Mg, Si, Cu, Mn, Ni, Zr, Ag, Cr, and Zn, and a remainder of Al and an inevitable impurity, and
in a transverse section of the aluminum alloy wire, a surface-layer crystallization measurement region in a shape of a rectangle having a short side length of 50 μm and a long side length of 75 μm is defined within a surface layer region extending from a surface of the aluminum alloy wire by 50 μm in a depth direction, and an average area of crystallized materials in the surface-layer crystallization measurement region is equal to or more than 0.05 μm 2 and equal to or less than 3 μm 2 .

2. The aluminum alloy wire according to claim 1 , wherein the number of the crystallized materials in the surface-layer crystallization measurement region is more than 10 and equal to or less than 400.

3. The aluminum alloy wire according to claim 1 , wherein, in the transverse section of the aluminum alloy wire, an inside crystallization measurement region in a shape of a rectangle having a short side length of 50 μm and a long side length of 75 μm is defined such that a center of the rectangle of the inside crystallization measurement region coincides with a center of the aluminum alloy wire, and an average area of crystallized materials in the inside crystallization measurement region is equal to or more than 0.05 μm 2 and equal to or less than 40 μm 2 .

4. The aluminum alloy wire according to claim 1 , wherein an average crystal grain size of the aluminum alloy is equal to or less than 50 μm.

5. The aluminum alloy wire according to claim 1 , wherein, in the 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 μm and a long side length of 50 μm is defined within a surface layer region extending from a surface of the aluminum alloy wire by 30 μm 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 μm 2 .

6. The aluminum alloy wire according to claim 5 , wherein, in the transverse section of the aluminum alloy wire, an inside void measurement region in a shape of a rectangle having a short side length of 30 μm and a long side length of 50 μm is defined such that a center of the rectangle of the inside void measurement region coincides with a center of the aluminum alloy wire, and a ratio of a total cross-sectional area of voids in the inside void measurement region to the total cross-sectional area of the voids in the surface-layer void measurement region is equal to or more than 1.1 and equal to or less than 44.

7. The aluminum alloy wire according to claim 5 , wherein a content of hydrogen is equal to or less than 4.0 ml/100 g.

8. The aluminum alloy wire according to claim 1 , wherein a work hardening exponent is equal to or more than 0.05.

9. The aluminum alloy wire according to claim 1 , wherein a dynamic friction coefficient is equal to or less than 0.8.

10. The aluminum alloy wire according to claim 1 , wherein a surface roughness is equal to or less than 3 μm.

11. The aluminum alloy wire according to claim 1 , wherein a lubricant adheres to a surface of the aluminum alloy wire, and an amount of adhesion of C originated from the lubricant is more than 0 mass % and equal to or less than 30 mass %.

12. The aluminum alloy wire according to claim 1 , wherein the aluminum alloy wire has a surface oxide film having a thickness of equal to or more than 1 nm and equal to or less than 120 nm.

13. The aluminum alloy wire according to claim 1 , wherein
tensile strength is equal to or more than 110 MPa and equal to or less than 200 MPa,
0.2% proof stress is equal to or more than 40 MPa,
breaking elongation is equal to or more than 10%, and
electrical conductivity is equal to or more than 55% IACS.

14. An aluminum alloy strand wire comprising a plurality of the aluminum alloy wires according to claim 1 , the plurality of the aluminum alloy wires being stranded together.

15. The aluminum alloy strand wire according to claim 14 , wherein a strand pitch is equal to or more than 10 times and equal to or less than 40 times as large as a pitch diameter of the aluminum alloy strand wire.

16. A covered electrical wire comprising:
a conductor; and
an insulation cover that covers an outer circumference of the conductor, wherein
the conductor includes the aluminum alloy strand wire according to claim 14 .

17. A terminal-equipped electrical wire comprising:
the covered electrical wire according to claim 16 ; and
a terminal portion attached to an end portion of the covered electrical wire.

Assignees

• Sumitomo Electric Industries
• Autonetworks Technologies Ltd
• Sumitomo Wiring Systems

Inventors

• Kusakari Misato
• Kuwabara Tetsuya
• Nakai Yoshihiro
• Nishikawa Taichiro
• Otsuka Yasuyuki
• OOI Hayato

Classifications

• H01B7/02

  Disposition of insulation · CPC title

• H01B5/08

  Several wires or the like stranded in the form of a rope · CPC title

• H01B1/023 Primary

  Alloys based on aluminium · CPC title

• C22C21/00 Primary

  Alloys based on aluminium · CPC title

• B22D21/04

  Casting aluminium or magnesium {(no material; see B22D21/007)} · CPC title