# US 9,039,850 B2 · Aluminum alloy material for forging

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- Number: US 9,039,850 B2
- Document ID: US9039850B2
- Status: Granted
- Kind: B2
- Application number: 12/809,130
- Filed: 2008-12-12
- Published: 2011-08-18
- Granted: 2015-05-26
- Earliest claimed: 2007-12-21
- Assignees: Showa Denko K.K.
- Applicants: Hideki Takemura
- Inventors: Hideki Takemura
- Web page: https://patentgrep.com/patent/US9039850B2

## CPC

- C22F 1/057: of alloys with copper as the next major constituent
- B21J 5/00: Methods for forging, hammering, or pressing (for working sheet-metal or metal tubes, rods, or profiles B21D; for working wire B21F); Special equipment or accessories therefor
- B21K 1/76: elements not mentioned in one of the preceding groups
- C22C 21/14: with silicon
- C22C 21/16: with magnesium
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)
- B21J: FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES (rolling of metal B21B; making particular products by forging or pressing B21K; cladding or plating B23K; finishing surfaces by hammering B23P9/04; compacting surfaces by blasting with particulate material B24C1/10; general features of presses, presses for consolidating scrap B30B; furnaces in general F27)
- B21K: MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS (making particular articles by working sheet metal without essentially removing material B21D; processing wire B21F; making pins, needles or nails B21G; making particular articles by rolling B21H; forging machines, pressing machines, hammering machines, in general B21J; making chains B21L; plating B23K)
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

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-1B 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.

## Claims

### Claim 1

A method of manufacturing an aluminum alloy forging material, comprising:
obtaining 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 by continuously casting a molten aluminum alloy having an aluminum 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 a 5Ti-1B mother alloy, and Ti/Zr ratio satisfies 0.3 or higher;
obtaining an aluminum alloy cast product by subjecting the aluminum alloy ingot to homogenization treatment for holding the product for one hour or more at temperatures of 450 to 510° C.,
hot forging the aluminum alloy cast product under temperature conditions of 400 to 510° C.,
subjecting the aluminum alloy cast product to a solution treatment under temperature conditions of 450 to 510° C., and
subjecting the aluminum alloy cast product to an aging treatment,
wherein the aluminum alloy cast product is constituted as the aluminum alloy forging material.