# US 2010/0166593 A1 · Production method of extrusion billet and production method of magnesium alloy material

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- Number: US 2010/0166593 A1
- Document ID: US20100166593A1
- Status: Published application
- Kind: A1
- Application number: 12/600,709
- Filed: 2008-06-19
- Published: 2010-07-01
- Earliest claimed: 2007-07-31
- Assignees: Kurimoto, Ltd.
- Inventors: Katsuyoshi Kondoh; Makoto Hotta; Jinsun Liao; Kantaro Kaneko; Norio Fujii; Hirohito Kametani; Akihiko Koshi
- Web page: https://patentgrep.com/patent/US20100166593A1

## CPC

- C22F 1/06: of magnesium or alloys based thereon
- B21C 23/002: {Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences}
- B21C 23/01: starting from material of particular form or shape, e.g. mechanically pre-treated (B21C23/22 takes precedence)
- B21C 29/00: Cooling or heating extruded work or parts of the extrusion press
- B21J 1/025: {affecting grain orientation}
- B22F 3/20: by extruding
- C22C 1/0408: {Light metal alloys}
- B21B 1/024: {Forging or pressing (forging or pressing devices as units B21B15/0035)}
- B22F 2998/10: Processes characterised by the sequence of their steps
- 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)
- B21C: MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- 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)
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- B21B: ROLLING OF METAL (auxiliary operations used in connection with metal-working operations covered in B21, see B21C; bending by rolling B21D; manufacture of particular objects, e.g. screws, wheels, rings, barrels, balls, by rolling B21H; pressure welding by means of a rolling mill B23K20/04)

## Abstract

A production method of an extrusion billet includes a step of preparing a plate or lump starting material comprising a magnesium alloy, a step of performing a plastic deformation process at a rolling reduction of 70% or more to the starting material at a temperature of 250° C. or lower to introduce a strain without generating dynamic recrystallization, a step of producing powder by granulating the material after the plastic deformation process, and a step of producing a powder billet by compressing the powder.

## Claims

### Claim 1

A production method of an extrusion billet comprising the steps of:
preparing a plate or lump starting material comprising a magnesium alloy;
performing a plastic deformation process at a rolling reduction of 70% or more to said starting material at a temperature of 250° C. or lower to introduce a strain without generating dynamic recrystallization;
producing powder by granulating the material after said plastic deformation process; and
producing a powder billet by compressing said powder.

### Claim 2 (depends on 1)

The production method of the extrusion billet according to claim 1, wherein
the temperature of said starting material during said plastic deformation process is set to 50° C. or lower.

### Claim 3 (depends on 1)

The production method of the extrusion billet according to claim 1, wherein
the rolling reduction of said plastic deformation process is set to 80% or more.

### Claim 4 (depends on 1)

The production method of the extrusion billet according to claim 1, wherein
said plastic deformation process comprises a rolling process for rolling said starting material using a pair of rolls.

### Claim 5 (depends on 1)

The production method of the extrusion billet according to claim 1, wherein
said plastic deformation process comprises a pressing process for compressing and deforming said starting material.

### Claim 6

A production method of an magnesium alloy material comprising the steps of:
preparing a plate or lump starting material comprising a magnesium alloy;
performing a plastic deformation process at a rolling reduction of 70% or more to said starting material at a temperature of 250° C. or lower to introduce a strain without generating dynamic recrystallization;
producing powder by granulating the material after said plastic deformation process;
producing a powder billet by compressing said powder; and
extruding said powder billet at temperatures of 150 to 400° C.

### Claim 7 (depends on 6)

The production method of the magnesium alloy material according to claim 6, wherein
after the plastic deformation process for the starting material, said powder is set in an inert gas atmosphere to prevent a powder surface from being oxidized during the steps until said powder billet is produced.