摘要:
A method for efficiently producing a strong and light Al alloy joined body is provided. The method for producing an Al alloy joined body of the present invention includes a step of obtaining an Al alloy melt having a predetermined alloy composition, a step of obtaining an Al alloy ingot having a predetermined composition by continuously casting the Al alloy melt, a step of obtaining an Al alloy cast member by subjecting the Al alloy ingot to a homogenization treatment, a step of obtaining an Al alloy forged member by subjecting the Al alloy cast member to hot forging, a step of subjecting the Al alloy forged member to a solution heat treatment, a step of subjecting teal alloy forged member after the solution heat treatment to a single-step aging treatment, and a step of obtaining an Al alloy joined body by welding the Al alloy forged member after the single-step aging treatment with an Al alloy component to be joined.
摘要:
An aluminum alloy forging material of the present invention is constituted by an aluminum alloy cast product obtained by subjecting an aluminum alloy ingot having a structure in which a secondary dentrite arm spacing (DAS) is 40 µm or less and an average grain diameter of crystallized substances is 8 µm or less to homogenization treatment for holding the ingot for one hour or more under temperature conditions of 450 to 510 °C, wherein the ingot is obtained by continuously casting a molten aluminum alloy having an alloy composition consisting of: Si: 0.80 to 1.15 mass%; Fe: 0.2 to 0.5 mass%; Cu: 3.8 to 5 mass%; Mn: 0.8 to 1.15 mass%; Mg: 0.5 to 0.8 mass%; Zr: 0.05 to 0.13 mass%; and Ti contained in such an amount that a sum of Ti and Zr is 0.2 mass% or less, and the balance being Al and inevitable impurities, wherein the alloy composition satisfies a Cu/Mg ratio of 8 or less, Ti is added in a form of an Al master alloy (5Ti-lB mother alloy) in which Ti and B are contained at a ratio of 5:1, and a Ti/Zr ratio satisfies 0.3 or higher.