EP1252352A2 - Method for providing magnesium alloys with superplastic properties - Google Patents
Method for providing magnesium alloys with superplastic propertiesInfo
- Publication number
- EP1252352A2 EP1252352A2 EP01909511A EP01909511A EP1252352A2 EP 1252352 A2 EP1252352 A2 EP 1252352A2 EP 01909511 A EP01909511 A EP 01909511A EP 01909511 A EP01909511 A EP 01909511A EP 1252352 A2 EP1252352 A2 EP 1252352A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- alloy
- magnesium
- heated
- cooled
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2201/00—Treatment for obtaining particular effects
- C21D2201/02—Superplasticity
Definitions
- the present invention relates to a method for producing magnesium alloys with a superplastic structure.
- the productivity in the further processing of semi-finished products into complex shaped finished parts can be significantly increased compared to conventional forming processes.
- the superplastic shaping of metals and their alloys is a cost-effective manufacturing process, in particular in the manufacture of components with precise dimensions, which can alternatively only be produced by complex machining or joining processes.
- Superplasticity is understood to mean the ability of a material to achieve degrees of deformation when constricting only very low yield stresses without constrictions and practically no work hardening, which exceed the limits of about 10 to 40% that are usual for "normal plastic" materials by a few 100 to over 1000% .
- Another characteristic of the superplastic behavior of materials is the strong dependence of the yield stress on the strain rate.
- a disadvantage of the above processes is the fact that the alloys have to be heated to above the melting temperature and that the alloys are given the superplastic properties in each case by a very complex process (machining / sintering, melting, alloying), which in particular their handling difficult in industrial processes.
- the object of the present invention is to provide a method with which a structure in conventional magnesium-based alloys superplastic properties can be produced inexpensively.
- the method should be applicable regardless of the protective gas technology commonly used and should be easy to integrate into the existing production.
- the base alloy is first heated to a temperature of 250 to 600 ° C, more preferably 300 to 450 ° C and in particular 340 to 380 ° C.
- the alloy is subjected to rapid cooling at cooling rates greater than 300 ° C./min, more preferably from 500 to 10,000 ° C./min, and in particular from 6000 ° C./min.
- the invention proposes a method for producing magnesium alloys with a superplastic structure, which comprises the following steps:
- the base alloy is first slowly, preferably at a heating rate of 0.1 to 3.0 ° C / min, more preferably 0.2 to 1.0 ° C / min and in particular 0.4 to 0.6 ° C / min Temperature of 300 to 550 ° C, more preferably 350 to 450 ° C and in particular 390 to 420 ° C heated and 1 to 100 hours, preferably kept at this temperature for 10 to 35 hours and in particular 18 to 24 hours.
- the heated alloy is then cooled, preferably in air or in water, to a temperature of 0 to 100 ° C., preferably 15 to 50 ° C. and in particular to ambient temperature.
- the cooled alloy is then reheated to a temperature of 200 to 400 ° C., preferably 220 to 350 ° C. and in particular 250 to 310 ° C. and 1 to 100 hours, preferably 10 to 35 hours and in particular 18 to 24 hours kept at this temperature.
- the alloy reheated in this way is then cooled, preferably in air or in water, to a temperature of 0 to 100 ° C., preferably 15 to 50 ° C. and in particular to ambient temperature.
- preferred magnesium-based alloys for processing in the process according to the invention contain aluminum, zinc, manganese, silicon, copper, zirconium, silver and / or rare earth metals.
- Particularly preferred alloys are alloys which contain zinc, zirconium and rare earth metals, in particular those which, in addition to magnesium, essentially consist of these elements.
- Preferred rare earth metals are neodymium, thorium and yttrium.
- Examples of usable magnesium-based alloys are alloys of the types AM 20, AM 50, AM 60, AS 41, AS 21, AE 42, AZ 91, EZ 33, AZ 31, QE 22, QH 21, WE 54, ZC 63 and ZRE 1.
- the alloy preheated according to the invention is subjected to conventional forming processes in order to convert the alloy into a semi-finished product.
- Preferred forming processes are pressure forming processes such as that Extrusion, rolling or forging. Extrusion is particularly preferred.
- the forming of the magnesium alloy by extrusion preferably takes place with a compression ratio of greater than 1:15, more preferably from 1:15 to 1: 100, in particular 1:25 to 1:50 at a bolt temperature and a recipient temperature of 200 to 600 ° C., more preferably 300 to 400 ° C instead.
- the cooling of the cooled alloy is carried out by extrusion at a bolt temperature and a recipient temperature of 270 to 400 ° C, more preferably 330 to 370 ° C.
- the magnesium-based alloys achieve an elongation at break of up to 12% in the cast state according to the manufacturer.
- the magnesium-based alloys modified by the process according to the invention for improved superplastic formability achieved an elongation at break of up to in tensile tests in a temperature range from 300 to 400 ° C. and elongation rates of 1-10 " s 1 to 1-10 " 2 s "1 550%, while the magnesium-based alloys modified by the inventive method according to claim 4 to a superplastic forming in tensile tests at a temperature of 380 ° C and a constant forming speed of 0.05 mm / min. reached an elongation at break of up to 780%.
- FIG. 1 shows an undeformed AM20 tensile specimen (a), a tensile specimen of an untreated AM20 magnesium base alloy (b) deformed under the above conditions and a tensile specimen superplastically deformed under the above conditions of an AM20 magnesium base alloy (c) modified according to Example 1.
- a commercially available AM20 magnesium base alloy was heated to 350 ° C.
- the alloy was then shaped by extrusion with a compression ratio of 1:29 at a bolt temperature of 350 ° C and a recipient temperature of 350 ° C.
- the strand emerging from the extrusion die was cooled directly to 20 ° C. in a water bath.
- the microstructure was found to be in an amorphous state.
- the base alloy achieves an elongation at break of 12% in the cast state according to the manufacturer's instructions.
- the magnesium alloy processed by the method according to the invention reached an elongation at break of 550% in tensile tests at a temperature of 380 ° C. and a forming speed of 0.6 mm / min (see FIG. 1).
- FIG. 1 A commercially available AM20 magnesium base alloy was heated to 350 ° C.
- the alloy was then shaped by extrusion with a compression ratio of 1:29 at a bolt temperature of 350 ° C and a recipient temperature of 350
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Powder Metallurgy (AREA)
- Extrusion Of Metal (AREA)
- Forging (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03011735A EP1342805A3 (en) | 2000-01-25 | 2001-01-23 | Method for providing magnesium alloys with superplastic properties |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2000103970 DE10003970B4 (en) | 2000-01-25 | 2000-01-25 | Process for producing magnesium alloys having a superplastic microstructure |
DE10003970 | 2000-01-25 | ||
DE2000111334 DE10011334A1 (en) | 2000-03-10 | 2000-03-10 | Production of magnesium alloys used as a material for the construction of airplanes, spacecraft, high speed trains and cars comprises heating a magnesium-based alloy, deforming to a semi-finished product and rapidly cooling |
DE10011334 | 2000-03-10 | ||
PCT/DE2001/000256 WO2001055467A2 (en) | 2000-01-25 | 2001-01-23 | Method for providing magnesium alloys with superplastic properties |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03011735A Division EP1342805A3 (en) | 2000-01-25 | 2001-01-23 | Method for providing magnesium alloys with superplastic properties |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1252352A2 true EP1252352A2 (en) | 2002-10-30 |
EP1252352B1 EP1252352B1 (en) | 2004-04-21 |
Family
ID=26004105
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03011735A Withdrawn EP1342805A3 (en) | 2000-01-25 | 2001-01-23 | Method for providing magnesium alloys with superplastic properties |
EP01909511A Expired - Lifetime EP1252352B1 (en) | 2000-01-25 | 2001-01-23 | Method for providing magnesium alloys with superplastic properties |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03011735A Withdrawn EP1342805A3 (en) | 2000-01-25 | 2001-01-23 | Method for providing magnesium alloys with superplastic properties |
Country Status (7)
Country | Link |
---|---|
US (1) | US20030140992A1 (en) |
EP (2) | EP1342805A3 (en) |
AT (1) | ATE264928T1 (en) |
AU (1) | AU2001237234A1 (en) |
CA (1) | CA2398125A1 (en) |
DE (1) | DE50102051D1 (en) |
WO (1) | WO2001055467A2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100382905C (en) * | 2003-04-15 | 2008-04-23 | 彼德·施托尔菲希 | Method and equipment for manufacturing shaped plate parts |
DE102005027259B4 (en) * | 2005-06-13 | 2012-09-27 | Daimler Ag | Process for the production of metallic components by semi-hot forming |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005027258B4 (en) * | 2005-06-13 | 2013-01-31 | Daimler Ag | High carbon steel with superplasticity |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1187305A (en) * | 1967-05-22 | 1970-04-08 | Dow Chemical Co | Process for production of Extruded Magnesium-Lithium Alloy Articles |
US3709745A (en) * | 1970-10-19 | 1973-01-09 | Dow Chemical Co | Thermal process for improving the mechanical forming of magnesium alloys |
JPS61250144A (en) * | 1985-04-26 | 1986-11-07 | Ube Ind Ltd | Magnesium alloy for casting |
JP3719525B2 (en) * | 1994-11-14 | 2005-11-24 | 三井金属鉱業株式会社 | Manufacturing method of superplastic magnesium alloy material |
US5620537A (en) * | 1995-04-28 | 1997-04-15 | Rockwell International Corporation | Method of superplastic extrusion |
-
2001
- 2001-01-23 EP EP03011735A patent/EP1342805A3/en not_active Withdrawn
- 2001-01-23 AU AU2001237234A patent/AU2001237234A1/en not_active Abandoned
- 2001-01-23 AT AT01909511T patent/ATE264928T1/en not_active IP Right Cessation
- 2001-01-23 DE DE50102051T patent/DE50102051D1/en not_active Expired - Fee Related
- 2001-01-23 WO PCT/DE2001/000256 patent/WO2001055467A2/en active IP Right Grant
- 2001-01-23 CA CA002398125A patent/CA2398125A1/en not_active Abandoned
- 2001-01-23 EP EP01909511A patent/EP1252352B1/en not_active Expired - Lifetime
- 2001-01-23 US US10/181,892 patent/US20030140992A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO0155467A2 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100382905C (en) * | 2003-04-15 | 2008-04-23 | 彼德·施托尔菲希 | Method and equipment for manufacturing shaped plate parts |
DE102005027259B4 (en) * | 2005-06-13 | 2012-09-27 | Daimler Ag | Process for the production of metallic components by semi-hot forming |
Also Published As
Publication number | Publication date |
---|---|
EP1342805A2 (en) | 2003-09-10 |
US20030140992A1 (en) | 2003-07-31 |
DE50102051D1 (en) | 2004-05-27 |
EP1342805A3 (en) | 2004-03-17 |
AU2001237234A1 (en) | 2001-08-07 |
CA2398125A1 (en) | 2001-08-02 |
WO2001055467A3 (en) | 2002-04-25 |
EP1252352B1 (en) | 2004-04-21 |
WO2001055467A2 (en) | 2001-08-02 |
ATE264928T1 (en) | 2004-05-15 |
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