Aluminum-alloy sheet for bus bar and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-10475547-B2
Application number	US-201515126752-A
Country	US
Kind code	B2
Filing date	Apr 8, 2015
Priority date	Apr 10, 2014
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

An aluminum-alloy sheet for a bus bar has a chemical composition containing Mg: 0.3%-0.9% (mass %, likewise below), Si: 0.2%-1.2%, Cu: 0.2% or less, and Fe: 0.5% or less, the remainder being Al and unavoidable impurities. In addition, acicular particles containing Mg and Si are present in the Al matrix at 900-4,000 particles/μm2. In addition, Fe-based particles present in the above-mentioned Al matrix have an average circle-equivalent diameter of 5 μm or less, and the number of particles having a circle-equivalent diameter of more than 2 μm is 10,000 particles/mm2 or less.

First claim

The invention claimed is:

1. An aluminum-alloy sheet for a bus bar produced by a process comprising:
preparing a sheet material having a chemical composition containing Mg: 0.3%-0.9% (mass %, likewise below), Si: 0.2%-1.2%, Cu: 0.2% or less, and Fe: 0.5% or less, the remainder being Al and unavoidable impurities;
subjecting the sheet material to a solution heat treatment;
subsequently subjecting the sheet material to a skin pass with a rolling reduction of 1%-10%; and
subsequently subjecting the sheet material to an artificial-aging treatment;

wherein:
acicular particles containing Mg and Si are present in the Al matrix at 900-4,000 particles/μm 2 ; and
Fe-based particles present in the Al matrix have an average circle-equivalent diameter of 5 μm or less, and the number of particles having a circle-equivalent diameter of more than 2 μm is 10,000 particles/mm 2 or less.

2. The aluminum-alloy sheet according to claim 1 , wherein the aluminum-alloy sheet has a tensile strength of 170 MPa or higher and an electrical conductivity of 55% IACS or higher.

3. A method of manufacturing an aluminum-alloy sheet, comprising:
preparing a sheet material having a chemical composition containing Mg: 0.3%-0.9% (mass %, likewise below), Si: 0.2%-1.2%, Cu: 0.2% or less, and Fe: 0.5% or less, the remainder being Al and unavoidable impurities;
subjecting the sheet material to a solution heat treatment;
subsequently subjecting the sheet material to a skin pass with a rolling reduction of 1%-10%; and
subsequently subjecting the sheet material to an artificial-aging treatment,
wherein after the artificial-aging treatment:
acicular particles containing Mg and Si are present in the Al matrix of the aluminum-alloy sheet at 900-4,000 particles/μm 2 ; and
Fe-based particles present in the Al matrix of the aluminum-alloy sheet have an average circle-equivalent diameter of 5 μm or less, and the number of particles having a circle-equivalent diameter of more than 2 μm is 10,000 particles/mm 2 or less.

4. The method according to claim 3 , wherein the solution heat treatment is performed at 480° C.-600° C.

5. The method according to claim 3 , wherein the rolling reduction is 1.5%-9%.

6. The method according to claim 3 , wherein the artificial-aging treatment is performed at 160° C.-210° C.

7. The method according to claim 3 , wherein the chemical composition contains 0.35%-0.85% Mg.

8. The method according to claim 3 , wherein the chemical composition contains 0.25%-1.1% Si.

9. The method according to claim 3 , wherein the chemical composition contains 0.1% or less Cu.

10. The method according to claim 3 , wherein the chemical composition contains 0.4% or less Fe.

11. The method according to claim 10 , wherein the chemical composition contains 0.35%-0.85% Mg, 0.25%-1.1% Si and 0.1% or less Cu.

12. The method according to claim 11 , wherein the solution heat treatment is performed at 480° C.-600° C., the rolling reduction is 1.5%-9% and the artificial-aging treatment is performed at 160° C.-210° C.

13. The method according to claim 12 , wherein the chemical composition contains 0.65% Mg, 0.40% Si, 0.02% Cu, and 0.25% Fe, the remainder being Al and unavoidable impurities.

14. The aluminum-alloy sheet according to claim 1 , wherein the chemical composition contains 0.35%-0.85% Mg.

15. The aluminum-alloy sheet according to claim 1 , wherein the chemical composition contains 0.25%-1.1% Si.

16. The aluminum-alloy sheet according to claim 1 , wherein the chemical composition contains 0.1% or less Cu.

17. The aluminum-alloy sheet according to claim 1 , wherein the chemical composition contains 0.4% or less Fe.

18. The aluminum-alloy sheet according to claim 1 , wherein the chemical composition consists of 0.35%-0.85% Mg, 0.25%-1.1% Si, 0.4% or less Fe, and 0.1% or less Cu, the remainder being Al and unavoidable impurities.

19. The aluminum-alloy sheet according to claim 1 , wherein the chemical composition consists of 0.65% Mg, 0.40% Si, 0.02% Cu, and 0.25% Fe, the remainder being Al and unavoidable impurities.

20. A bus bar formed with the aluminum-alloy sheet according to claim 1 .

Assignees

• Uacj Corp

Inventors

• Nakanishi Hidetaka
• Asano Mineo

Classifications

• C22F1/05

  of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions · CPC title

• C22F1/043

  of alloys with silicon as the next major constituent · CPC title

• C22C21/08

  with silicon · CPC title

• H01B1/023 Primary

  Alloys based on aluminium · CPC title

• C22C21/02

  with silicon as the next major constituent · CPC title