Aluminium alloy material, and cable, electric wire, and spring member using same

Abstract

The present invention provides an aluminium alloy material which: has high resistance to flexural fatigue and prescribed elongation characteristics; contains, in terms of mass%, 0.20-1.80% Mg, 0.20-2.00% Si, and 0.01-1.50% Fe; and further contains at least one element selected from among Cu, Ag, Zn, Ni, Ti, Co, Au, Mn, Cr, V, Zr, and Sn in a total amount of 0.00-2.00%, with the remainder made up of Al and inevitable impurities. The aluminium alloy material has a fibrous metal structure in which crystal grains extend in one direction. In a section of the aluminium alloy material perpendicular to the longitudinal direction of the crystal grains, the average crystal particle size R1 of the crystal grains present at a position D, which is a position at a depth of 1 / 20 of the thickness of the aluminium alloy material from the surface of the aluminium alloy material, is 400 nm or less, and the ratio of the average crystal particle size R2 of the crystal grains present at a central position in the thickness direction of the aluminium alloy material to the average crystal particle size R1, R2 / R1, is 1.8 or higher.

Description

technical field [0001] The present invention relates to aluminum alloy materials and cables, wires and spring components using the same. Background technique [0002] Conventionally, copper-based metal materials have been widely used in thick rubber flexible cables such as robot cables, and cables for transmitting power or signals such as elevator cables. Recently, it is being studied to replace it with an aluminum-based material. Compared with a copper-based metal material, the aluminum-based material has a smaller specific gravity and a larger thermal expansion coefficient. In addition, the electrical and thermal conductivity is relatively good, and the resistance Excellent corrosion resistance. [0003] However, pure aluminum materials have a problem that the number of bending fatigue fractures (hereinafter referred to as bending fatigue resistance) is lower than that of copper-based metal materials. In addition, 2000-series (Al-Cu-based) and 7000-series (Al-Zn-Mg-based...

AI Technical Summary

Problems solved by technology

In addition, 2000-series (Al-Cu-based) and 7000-series (Al-Zn-Mg-based) aluminum alloy materials, which are aluminum-based alloy materials that utilize precipitation strengthening and relatively high bending fatigue resistance, have the following problems: corrosion resistance Poor performance, poor resistance to stress corrosion cracking, low electrical conductivity; etc.

However, in the copper-coated aluminum alloy wire described in Patent Document 2, the copper-based material that is easily plastically deformed due to its small elastic limit exists on the surface layer of the wire rod where the bending strain increases. Cracks occur on the surface, and the compound formed as the aluminum alloy core material and the copper coating layer will become a crack generation point, etc., and there is a problem that the bending fatigue resistance is poor.

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