WO2004027103A1 - 成形性に優れる展伸用マグネシウム薄板およびその製造方法 - Google Patents
成形性に優れる展伸用マグネシウム薄板およびその製造方法 Download PDFInfo
- Publication number
- WO2004027103A1 WO2004027103A1 PCT/JP2003/010407 JP0310407W WO2004027103A1 WO 2004027103 A1 WO2004027103 A1 WO 2004027103A1 JP 0310407 W JP0310407 W JP 0310407W WO 2004027103 A1 WO2004027103 A1 WO 2004027103A1
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- WO
- WIPO (PCT)
- Prior art keywords
- ray intensity
- weight
- workability
- rolling
- rolled
- Prior art date
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Classifications
-
- 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
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
-
- 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
Definitions
- the present invention relates to an inexpensive magnesium thin sheet for spreading, which is excellent in formability, particularly in press formability in cold conditions.
- wrought magnesium alloy sheets have been made thin by repeatedly heat-treating, hot-rolling, and warm-rolling a forged slab having a thickness of several mm to several tens of mm, or a thick plate formed by extrusion.
- Thin Mg alloy sheets produced by repeated heat treatment, hot rolling, warm rolling, etc. are inferior in workability at temperatures between room temperature and below the warm range, that is, cold workability, and are economical. However, it is expensive and has not been widely used.
- Mg alloys have lower specific gravity, higher specific stiffness than A1, and are inexpensive because they can be reduced in weight.
- Some magnesium alloys having excellent press formability have been disclosed (for example, see Patent Documents 1 to 3).
- the composition and rolling conditions total rolling reduction of 40 to 70% for improving press formability at 200 ° C. are disclosed (for example, see Patent Document 1). )).
- a part of the j3 phase of the bcc structure is formed in the ⁇ phase of the hep structure, or by making it a single phase, the ductility and bending workability in cold are improved. (See, for example, Patent Documents 2 and 3). Since lithium is an active metal, handling it industrially in large quantities poses safety problems as well as being expensive and significantly reducing the corrosion resistance of magnesium.
- Patent Documents 4 to 7 a method of hot working magnesium has been proposed (for example, see Patent Documents 4 to 7). These are intended to perform hot working efficiently, and Not aimed at improving shape.
- a study of processing methods and conditions for imparting large strain for the purpose of crystal grain refinement has been published (for example, see Patent Document 6). Although the crystal grain size is refined to 1 ⁇ or less, there is no mention of improvement in formability. Further, the shape is limited or hot forging needs to be repeated, so that a thin magnesium alloy sheet cannot be produced.
- Patent Document 1 Japanese Patent Application Laid-Open No. 6_293944 (pages 2 to 3), as Patent Document 2, Japanese Patent Application Laid-Open No. 6_25788 (pages 2 to 3, Patent Document 3; Japanese Patent No. 41066 (pages 2 to 3), Japanese Patent Application Laid-Open No. 5-81089 (pages 2 to 3) as Patent Document 4, Japanese Patent Application Laid-Open No. 6-81089 (pages 2 to 3) as Patent Document 5 JP-A-2000-271693 (pages 2 to 4) as Patent Document 6, and JP-A-2001-252703 (Pages 2 to 4) as Patent Document 7.
- ⁇ 2mm The X-ray intensity ratio in the X-ray diffraction [X-ray intensity on the (0002) plane] / [X-ray intensity on the (101 (upper face) 1) plane] is 1.0 to 3.5.
- the yield strength in the direction parallel to and perpendicular to the direction is 100 to 300 MPa, and the average crystal grain size is 3 to 100 ⁇ .
- the method for producing a wrought magnesium sheet according to claim 2 comprises: A1 at 2.0 to 5.0% by weight, Zn at 0.5 to 2.0% by weight, and Mn at less than 0.05% by weight.
- Rolled Mg alloy sheet consisting of Mg and unavoidable impurities is cold-rolled at a reduction ratio of 5 to 35%, and then heat-treated at a temperature range of 200 to 450 ° C. 2 to 2 mm, and the X-ray intensity ratio in X-ray diffraction [X-ray intensity of (0002) plane] / [(X-ray intensity of (101) (upper bar) 1) plane] is 1.0 to 3 5.
- the tensile strength in the direction parallel to and perpendicular to the rolling direction is 100 to 300 MPa, and the average crystal grain size is 3 to 100 ⁇ .
- the magnesium sheet for spreading described above contains 2.0 to 5.0% by weight of A1, 0.5 to 2.0% by weight of Zn, and less than 0.05% by weight of Mn, with the balance being Mg and less.
- ⁇ ⁇ Rolling of Mg alloy containing unavoidable impurities Rolls Mg alloy to prevent edge cracking and breakage during rolling and to produce sheets with excellent workability such as Erichsen value.
- the appropriate concentration range for each component is as follows.
- the more Mn is added the more effective it is in improving corrosion resistance and workability.
- the crystallized material does not form a solution, becomes brittle, and has problems in workability.
- Fe is preferably less than 0.035% by weight
- SH is less than 0.1% by weight
- Cu is less than 0.1% by weight
- Nb is preferably less than 0.005% by weight.
- a slab having the above composition is hot-rolled, and a hot-rolled Mg alloy sheet at 100 ° C or higher is cold-rolled.
- the rolled magnesium alloy is cold-rolled so that the thickness after rolling falls within the range of 0.2 to 2 mm.
- the rolling ratio is preferably in the range of 5 to 35%. This cold rolling is performed once, or two or more times.
- the rolling rate is preferably in the range of 5 to 35% .By rolling at this rolling rate and then heat-treating, the stretchability is greatly improved, and the Erichsen value exceeds the 4 mm which is the level of commercial materials , 5-7mm.
- the Erichsen value after the subsequent heat treatment is less than 4 mm, and the workability is not good.
- the heat treatment temperature is preferably in the range of 200 to 450 ° C. It is considered that the heat treatment causes the recovery of strain and the recrystallization, the crystal orientation becomes appropriate, and the workability is improved. Outside this temperature range, the Erichsen value is less than 4 mm, and sufficient workability cannot be obtained.
- the crystal orientation of the wrought magnesium alloy with excellent workability thus produced that is, the X-ray intensity ratio by X-ray diffraction [X-ray intensity of the (0002) plane] Z [(101 (upper part) 1) Surface X-ray intensity] is in the range of 1.0 to 3.5.
- the yield strength is in the range of 100 to 300 MPa in the direction parallel to and perpendicular to the rolling direction. Suitably the particle size is between 3 and 100 zm. If the yield strength is less than 100 MPa, the strength is insufficient, and if it exceeds 300 MPa, the workability becomes insufficient.
- Table 1 shows the rolled Mg alloy, rolling conditions, and heating conditions. The final thickness was 0.40 mm. Table 1 Sample preparation conditions
- Comparative Examples 1 and 2 are rolled Mg alloy sheets manufactured through the steps of slab extrusion, hot rolling, warm rolling and heat treatment. The evaluation method is as shown below.
- the overhang height is obtained by overhanging a magnesium alloy sheet using an Erichsen tester.
- the maximum overhang height (mm) before breaking was determined.
- the X-ray intensity was measured under the conditions of a voltage of 50 kV and a current of 19 O mA using Cu as the tube, and the X-ray intensity ratio [X-ray intensity on the (00002) plane] / [ X-ray intensity of the (101 (upper bar) 1) plane was determined.
- Table 2 shows the evaluation results.
- the wrought magnesium alloy sheet of the present invention is stretched compared to a commercially available magnesium alloy sheet (manufacturing process: extruded slab or billet ⁇ warm rolling at high pressure or further heat treatment). Excellent workability. This is because in the conventional method, the rolling texture with a high proportion of the bottom surface parallel to the sheet surface develops because the rate of reduction in sheet thickness by rolling is high, but the rolling conditions after warm rolling or further heat treatment must be controlled ( Cold rolling with low rolling reduction and heat treatment conditions) provide a texture with a small proportion of the bottom surface parallel to the plate surface.
- the wrought magnesium alloy sheet of the present invention has a composition containing 2.0 to 5.0% by weight of A1, 0.5 to 2.0% by weight of Zn, and less than 0.05% by weight of Mn, with the balance being the balance.
- a heat treatment is performed at a temperature of 200 to 450 ° C.
- X-ray intensity ratio in X-ray diffraction [X-ray intensity of (0002) plane] / [X-ray intensity of (101 (upper bar) 1) plane] was set to 1.0 to 3.5.
- the yield strength in the direction parallel to and perpendicular to the rolling direction is 100 to 300 MPa, and the crystal grain size is 3 to 100 ⁇ ni.
- the wrought magnesium of the present invention has remarkably excellent overhang workability as compared with a commercially available material produced by extruding a slab or a billet in a hot rolling process under a high pressure reduction or a heat treatment process.
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- 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)
- Metal Rolling (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003257860A AU2003257860A1 (en) | 2002-09-17 | 2003-08-18 | Magnesium thin plate for spread product being excellent in workability and method for production thereof |
JP2004537534A JPWO2004027103A1 (ja) | 2002-09-17 | 2003-08-18 | 成形性に優れる展伸用マグネシウム薄板およびその製造方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-270621 | 2002-09-17 | ||
JP2002270621 | 2002-09-17 |
Publications (1)
Publication Number | Publication Date |
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WO2004027103A1 true WO2004027103A1 (ja) | 2004-04-01 |
Family
ID=32024832
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/010407 WO2004027103A1 (ja) | 2002-09-17 | 2003-08-18 | 成形性に優れる展伸用マグネシウム薄板およびその製造方法 |
Country Status (3)
Country | Link |
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JP (1) | JPWO2004027103A1 (ja) |
AU (1) | AU2003257860A1 (ja) |
WO (1) | WO2004027103A1 (ja) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002126806A (ja) * | 2000-10-24 | 2002-05-08 | Sumitomo Metal Ind Ltd | マグネシウム合金板の製造方法 |
-
2003
- 2003-08-18 WO PCT/JP2003/010407 patent/WO2004027103A1/ja active Application Filing
- 2003-08-18 JP JP2004537534A patent/JPWO2004027103A1/ja active Pending
- 2003-08-18 AU AU2003257860A patent/AU2003257860A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002126806A (ja) * | 2000-10-24 | 2002-05-08 | Sumitomo Metal Ind Ltd | マグネシウム合金板の製造方法 |
Non-Patent Citations (1)
Title |
---|
KAZUNORI OTOSHI ET AL.: "Magnesium gokinban no atsuen joken ni yoru kikaiteki seishitsu oyobi shugo soshiki no henka", KEIKINZOKU, vol. 51, no. 10, October 2001 (2001-10-01), pages 534 - 538, XP002975690 * |
Also Published As
Publication number | Publication date |
---|---|
AU2003257860A1 (en) | 2004-04-08 |
JPWO2004027103A1 (ja) | 2006-01-19 |
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