Aluminum alloy wire rod, aluminum alloy stranded wire, coated wire, wire harness and manufacturing method of aluminum alloy wire rod

• US 9,991,024 B2
• Filed: 04/10/2017
• Issued: 06/05/2018
• Est. Priority Date: 03/29/2013
• Status: Active Grant

• Current Assignee: Furukawa Electric Company Limited
• Original Assignee: Furukawa Automotive Systems Incorporated (Furukawa Electric Company Limited), Furukawa Electric Company Limited
• Inventors: Sekiya, Shigeki, Yoshida, Sho, Susai, Kyota, Mitose, Kengo
• Primary Examiner(s): Thompson, Timothy
• Assistant Examiner(s): Alonzo Miller, Rhadames J
• Application Number:
  US15/483,013
• Publication Number:
  US 20170213619A1
• Time in Patent Office: 421 Days
• Field of Search: 174 72 A, 174110 R, 1741281, 420544, 420546, 420535, 428544
• 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: B22D 11/003 Aluminium alloys
• CPC Class Codes: B22D 11/0602 formed by a casting wheel and belt, e.g. Properzi-process
• CPC Class Codes: B22D 21/007 with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
• CPC Class Codes: B23K 35/404 Coated rods; Coated electrodes
• CPC Class Codes: C21D 8/06 during manufacturing of rods or wires
• CPC Class Codes: C21D 9/525 for wire, for rods C21D9/54 takes precedence
• CPC Class Codes: C22C 21/00 Alloys based on aluminium
• CPC Class Codes: C22C 21/02 with silicon as the next major constituent
• CPC Class Codes: C22C 21/08 with silicon
• CPC Class Codes: C22C 21/14 with silicon
• CPC Class Codes: C22C 21/16 with magnesium
• CPC Class Codes: C22F 1/043 of alloys with silicon as the next major constituent
• CPC Class Codes: C22F 1/047 of alloys with magnesium as the next major constituent
• CPC Class Codes: C22F 1/05 of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions
• CPC Class Codes: C22F 1/057 of alloys with copper as the next major constituent
• CPC Class Codes: H01B 1/023 Alloys based on aluminium
• CPC Class Codes: H01B 13/0016 for heat treatment
• CPC Class Codes: H01B 7/0045 Cable-harnesses
• CPC Class Codes: Y10T 428/12 : All metal or with adjacent metals

Abstract

An aluminum alloy wire rod comprising 0.1-1.0 mass % Mg; 0.1-1.0 mass % Si; 0.01-1.40 mass % Fe; 0.01-0.50 mass % Zr; 0.000-0.100 mass % Ti; 0.000-0.030 mass % B; 0.00-1.00 mass % Cu; 0.00-0.50 mass % Ag; 0.00-0.50 mass % Au; 0.00-1.00 mass % Mn; 0.00-1.00 mass % Cr; 0.00-0.50 mass % Hf; 0.00-0.50 mass % V; 0.00-0.50 mass % Sc; 0.00-0.50 mass % Co; and 0.00-0.50 mass % Ni, a Mg/Si ratio being greater than 1, wherein a dispersion density of an Mg₂Si compound having a particle size of 0.5 μm to 5.0 μm is less than or equal to 3.0×10⁻³ particles/μm², and in the sectional structure, a concentration of each of Mg and Si other than a compound is less than or equal to 2.00 mass %.

Claims

1. An aluminum alloy wire rod having a composition comprising 0.1 mass % to 1.0 mass % Mg;

0.1 mass % to 1.0 mass % Si;

0.01 mass % to 1.40 mass % Fe;

0.01 mass % to 0.50 mass % Zr;

0.000 mass % to 0.100 mass % Ti;

0.000 mass % to 0.030 mass % B;

0.00 mass % to 1.00 mass % Cu;

0.00 mass % to 0.50 mass % Ag;

0.00 mass % to 0.50 mass % Au;

0.00 mass % to 1.00 mass % Mn;

0.00 mass % to 1.00 mass % Cr;

0.00 mass % to 0.50 mass % Hf;

0.00 mass % to 0.50 mass % V;

0.00 mass % to 0.50 mass % Sc;

0.00 mass % to 0.50 mass % Co; and

0.00 mass % to 0.50 mass % Ni, a Mg/Si ratio being greater than 1,

wherein a dispersion density of an Mg₂Si compound having a particle size of 0.5 μ

m to 5.0 μ

m is less than or equal to 3.0×

10<sup>−

3</sup> particles/μ

m², and

in a sectional structure, a concentration of each of Mg and Si other than a compound is less than or equal to 2.00 mass %.

2. The aluminum alloy wire rod according to claim 1, wherein in the sectional structure, a concentration of each of Fe, Ti, B, Cu, Ag, Au, Mn, Cr, Zr, Hf, V, Sc, Co and Ni other than a compound is less than or equal to 1.00 mass %.

3. The aluminum alloy wire rod according to claim 1, wherein in the sectional structure, a concentration of each of Mg, Si, Fe, Ti, B, Cu, Ag, Au, Mn, Cr, Zr, Hf, V, Sc, Co and Ni other than a compound is less than or equal to 1.00 mass %.

4. The aluminum alloy wire rod according to claim 1, wherein the composition contains one or two element(s) selected from a group consisting of 0.001 mass % to 0.100 mass % Ti;

and 0.001 mass % to 0.030 mass % B.

5. The aluminum alloy wire rod according to claim 1, wherein the composition contains one or more element(s) selected from a group consisting of 0.01 mass % to 1.00 mass % Cu;

0.01 mass % to 0.50 mass % Ag;

0.01 mass % to 0.50 mass % Au;

0.01 mass % to 1.00 mass % Mn;

0.01 mass % to 1.00 mass % Cr;

0.01 mass % to 0.50 mass % Hf;

0.01 mass % to 0.50 mass % V;

0.01 mass % to 0.50 mass % Sc;

0.01 mass % to 0.50 mass % Co; and

0.01 mass % to 0.50 mass % Ni.

6. The aluminum alloy wire rod according to claim 1, wherein the composition has a sum of contents of Fe, Ti, B, Cu, Ag, Au, Mn, Cr, Zr, Hf, V, Sc, Co, and Ni of 0.02 mass % to 2.00 mass %.

7. The aluminum alloy wire rod according to claim 1, wherein an impact absorption energy is greater than or equal to 5 J/mm².

8. The aluminum alloy wire rod according to claim 1, wherein number of cycles to fracture measured in a bending fatigue test at an ordinary temperature is greater than or equal to 200,000 cycles.

9. The aluminum alloy wire rod according to claim 1, wherein number of cycles to fracture measured in a bending fatigue test in a constant temperature tank at a temperature of 120°

C. is 400,000 cycles to 630,000 cycles.

10. The aluminum alloy wire rod according to claim 1, wherein the aluminum alloy wire rod is an aluminum alloy wire having a diameter of 0.1 mm to 0.5 mm.

11. An aluminum alloy stranded wire comprising a plurality of aluminum alloy wire rods as claimed in claim 10 which are stranded together.

12. A coated wire comprising a coating layer at an outer periphery of the aluminum alloy wire rod as claimed in claim 10.

13. A coated wire comprising a coating layer at an outer periphery of the aluminum alloy stranded wire as claimed in claim 11.

15. A method of manufacturing an aluminum alloy wire rod as claimed in claim 1, the aluminum alloy wire rod being obtained by forming a drawing stock through hot working subsequent to melting and casting, and thereafter carrying out processes including a first wire drawing process, a first heat treatment process, a second wire drawing process, a second heat treatment process and an aging heat treatment process in this order,

wherein the first heat treatment process includes, after heating to a predetermined temperature within a range of 480°

C. to 620°

C., cooling at an average cooling rate of greater than or equal to 10°

C./s at least to a temperature of 150°

C., and

the second heat treatment includes, after heating to a predetermined temperature within a range of higher than or equal to 300°

C. and lower than 480°

C. for less than two minutes, cooling at an average cooling rate of greater than or equal to 9°

C./s at least to a temperature of 150°

C.

14. A wire harness comprising:

a coated wire including a coating layer at an outer periphery of one of an aluminum alloy wire rod and an aluminum alloy stranded wire, the aluminum alloy stranded wire comprising a plurality of the aluminum alloy wire rods which are stranded together; and

a terminal fitted at an end portion of the coated wire, the coating layer being removed from the end portion,

the aluminum alloy wire rod having a composition comprising 0.1 mass % to 1.0 mass % Mg, 0.1 mass % to 1.0 mass % Si;

0.01 mass % to 1.40 mass % Fe;

0.01 mass % to 0.50 mass % Zr;

0.000 mass % to 0.100 mass % Ti;

0.000 mass % to 0.030 mass % B;

0.00 mass % to 1.00 mass % Cu;

0.00 mass % to 0.50 mass % Ag;

0.00 mass % to 0.50 mass % Au;

0.00 mass % to 1.00 mass % Mn;

0.00 mass % to 1.00 mass % Cr;

0.00 mass % to 0.50 mass % Hf;

0.00 mass % to 0.50 mass % V;

0.00 mass % to 0.50 mass % Sc;

0.00 mass % to 0.50 mass % Co; and

0.00 mass % to 0.50 mass % Ni, a Mg/Si ratio being greater than 1,

wherein

a dispersion density of an Mg₂Si compound having a particle size of 0.5 μ

m to 5.0 μ

m is less than or equal to 3.0×

10<sup>−

3</sup> particles/μ

m², and

in a sectional structure, a concentration of each of Mg and Si other than a compound is less than or equal to 2.00 mass %.