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

• US 10,706,986 B2
• Filed: 11/05/2019
• Issued: 07/07/2020
• Est. Priority Date: 10/31/2016
• Status: Active Grant

• Current Assignee: Autonetworks Technologies, Ltd. (Sumitomo Corporation), Sumitomo Electric Industries Limited (Sumitomo Corporation), Sumitomo Wiring Systems Limited (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Inventors: Kusakari, Misato, Kuwabara, Tetsuya, Nakai, Yoshihiro, Nishikawa, Taichiro, Otsuka, Yasuyuki, Ooi, Hayato
• Primary Examiner(s): Thompson, Timothy J
• Assistant Examiner(s): McAllister, Michael F
• Application Number:
  US16/674,015
• Publication Number:
  US 20200075191A1
• Time in Patent Office: 245 Days
• Field of Search: 174 74 R
• CPC Class Codes: B21C 1/003 Drawing materials of special alloys so far as the composition of the alloy requires or permits special drawing methods or sequences
• CPC Class Codes: B21C 1/02 Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
• CPC Class Codes: B21C 37/047 of fine wires
• CPC Class Codes: B21C 9/00 Cooling, heating or lubricating drawing material B21C3/14 takes precedence
• CPC Class Codes: B21F 7/00 Twisting wire; Twisting wire together for connections of limited size B21F15/04
• CPC Class Codes: C22C 21/00 Alloys based on aluminium
• CPC Class Codes: 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
• CPC Class Codes: C22F 1/04 of aluminium or alloys based thereon
• CPC Class Codes: H01B 1/02 mainly consisting of metals or alloys
• CPC Class Codes: H01B 1/023 Alloys based on aluminium
• CPC Class Codes: H01B 13/0016 for heat treatment
• CPC Class Codes: H01B 13/0207 Details; Auxiliary devices
• CPC Class Codes: H01B 13/14 by extrusion extrusion in general B29C48/00
• CPC Class Codes: H01B 7/02 Disposition of insulation

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.

Claims

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 μ

m and a long side length of 75 μ

m is defined within a surface layer region extending from a surface of the aluminum alloy wire by 50 μ

m 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 μ

m² and equal to or less than 3 μ

m².

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 μ

m and a long side length of 75 μ

m 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 μ

m² and equal to or less than 40 μ

m².

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 μ

m.

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 μ

m and a long side length of 50 μ

m is defined within a surface layer region extending from a surface of the aluminum alloy wire by 30 μ

m 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 μ

m².

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 μ

m and a long side length of 50 μ

m 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 μ

m.

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.