Aluminum alloy forged material for automobile and method for manufacturing the same

Abstract

The aluminum alloy forged material for an automobile according to the present invention is composed of an aluminum alloy including Si: 0.7-1.5 mass %, Fe: 0.5 mass % or less, Cu: 0.1-0.6 mass %, Mg: 0.6-1.2 mass %, Ti: 0.01-0.1 mass % and Mn: 0.25-1.0 mass %, further including at least one element selected from Cr: 0.1-0.4 mass % and Zr: 0.01-0.2 mass %, restricting Zn: 0.05 mass % or less, and a hydrogen amount: 0.25 ml / 100 g-Al or less, with the remainder being Al and inevitable impurities, wherein the aluminum alloy forged material has an area ratio the <111> texture of 60% or more in a cross section parallel to the extrusion direction.

Description

technical field [0001] The present invention relates to an aluminum alloy forging part for automobiles and a manufacturing method thereof. Background technique [0002] As a prior art related to an aluminum alloy forged material (aluminum alloy forged material for automobiles) used for a running part of an automobile or the like, there is an invention described in Patent Document 1, for example. The aluminum alloy forging according to the invention described in Patent Document 1 contains Mg: 0.6 to 1.8 mass %, Si: 0.8 to 1.8 mass %, Cu: 0.2 to 1.0 mass %, and the mass ratio of Si / Mg is 1 In addition, one or two or more of Mn: 0.1 to 0.6 mass %, Cr: 0.1 to 0.2 mass %, and Zr: 0.1 to 0.2 mass % are contained, and the rest is composed of Al and unavoidable impurities. In addition, in the aluminum alloy forging of the above-mentioned composition, the thickness of the thinnest part is 30 mm or less, the electrical conductivity measured on the surface of the aluminum alloy forgin...

AI Technical Summary

Problems solved by technology

[0003] However, as mentioned above, the 0.2% yield strength of the aluminum alloy forging described in Patent Document 1 is limited to 350 MPa or more, but according to the examples, it is about 370 MPa at most.

In addition, the elongation rate is good as a mechanical property, but the tensile strength is less than 400 MPa

[0004] In recent years, aluminum alloy forgings for automobiles are required to be further reduced in weight, and high strength is required to achieve this. However, in the invention described in Patent Document 1, there is a problem that the tensile strength and 0.2% yield strength cannot be improved. , Elongation is equipped at a high level, that is, the situation where high strength cannot be achieved

Images