Aluminum alloy plastic worked article, method for manufacturing the same, and automobile component

Abstract

To provide an aluminum alloy plastic worked article in which an aluminum texture state having preferable corrosion resistance and preferable mechanical characteristics in terms of, for example, the strength, the proof stress, and the elongation is formed.In an aluminum alloy plastic worked article including a plastic worked portion which is formed of a thinned portion 22 formed by plastic working and rib portions 21 formed at two ends of this thinned portion 22 and which has an approximately H-shaped or U-shaped cross-section, the plastic worked portion is a plastic worked portion 2 having strain portions 23 in each of which an equivalent strain of up to 4.0 mm / mm generated by plastic working is present, and the strain portions 23 are each located in the vicinity of the surface of the plastic worked portion 2 at a boundary between the thinned portion 22 and each of the rib portions 21 and are each formed of a non-recrystalline texture N of aluminum (atomic symbol: Al) which is not recrystallized or are each formed of the non-recrystalline texture N and a fine crystalline texture M which is recrystallized but has a crystal grain of 500 μm or less.

Description

TECHNICAL FIELD[0001]The present invention relates to an aluminum alloy plastic worked article manufactured from an ingot of an Al—Mg—Si-based aluminum alloy, a method for manufacturing the same, and an automobile component.BACKGROUND ART[0002]In recent years, aluminum alloy plastic worked articles manufactured from ingots of Al—Mg—Si-based aluminum alloys have been used as structural materials (components) of transport apparatuses, such as vehicles, boats and ships, aircrafts, automobiles, or two-wheeled motor vehicles. The reason for this is that the Al—Mg—Si-based aluminum alloy has excellent workability and a high strength and also has corrosion resistance.[0003]For example, A6061, which is one type of Al—Mg—Si-based aluminum alloy, has been frequently used for automobile components, such as a suspension arm. However, in order to reduce the weight of a vehicle body, a material lighter than A6061 has been requested. In order to respond to this request, the reduction in required a...

AI Technical Summary

Benefits of technology

The present invention relates to an aluminum alloy plastic worked article with improved strength, proof stress, and elongation. The article maintains a preferable aluminum texture even after a solution treatment after plastic working. The article has excellent corrosion resistance and reduced weight, making it suitable for various applications, such as automobile components where weight reduction is critical.

Problems solved by technology

However, when the Cu element amount is 0.05% or more, since the sensibility to grain-boundary corrosion is increased, if the Al—Mg—Si-based aluminum alloy is used under corrosive environment, stress corrosion cracks may be generated in some cases.

However, since an increase in addition amount of a Cu element degrades the corrosion resistance, the corrosion weight loss generated thereby cannot be suppressed.

That is, there has been a problem in that those Al—Mg—Si-based aluminum alloy raw materials are not suitably used in a severe corrosive environment.

Images