CN102392203A - Method for improving stamping formability of magnesium alloy sheet - Google Patents
Method for improving stamping formability of magnesium alloy sheet Download PDFInfo
- Publication number
- CN102392203A CN102392203A CN2011103333703A CN201110333370A CN102392203A CN 102392203 A CN102392203 A CN 102392203A CN 2011103333703 A CN2011103333703 A CN 2011103333703A CN 201110333370 A CN201110333370 A CN 201110333370A CN 102392203 A CN102392203 A CN 102392203A
- Authority
- CN
- China
- Prior art keywords
- magnesium alloy
- alloy plate
- alloy sheet
- room temperature
- drawing performance
- 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.)
- Pending
Links
Abstract
The invention discloses a method for improving the stamping formability of a magnesium alloy sheet. The magnesium alloy sheet is drawn or rolled at room temperature; the deformation amount of the magnesium alloy sheet is 2 percent to 10 percent; and after being drawn or rolled, the magnesium alloy sheet is annealed. By adopting the method, technological prejudices are overcome; the magnesium alloy sheet is deformed within a critical deformation degree range (2 percent to 10 percent) through being drawn or rolled, and then annealed, so that the magnesium alloy sheet with grains of large sizes are acquired; but the grains of large sizes are easy to be twinned in the deformation process and the grain orientation is changed by the twinning, so that the grain orientation going against slippage becomes favorable. By utilizing the contribution of the twinning to plastic deformation, the stamping formability of magnesium alloy sheet is improved.
Description
Technical field
The invention belongs to non-ferrous metal plastic working field, be specifically related to a kind of method of improving magnesium alloy plate drawing performance.
Background technology
As the lightest structural metallic materials, magnesiumalloy has lot of advantages, the capability of electromagnetic shielding high like specific tenacity, that specific rigidity is high and higher etc., so magnesiumalloy is widely used in automobile and electronic industry.In the last few years; Fields such as Aeronautics and Astronautics, automobile, 3C Product and military project constantly increase the demand of magnesiumalloy; Requirement to its mechanical property also improves constantly, and traditional cast magnesium alloy can't meet the demands gradually, in this case; The wrought magnesium alloys product that adopts plastic working techniques such as extruding, rolling, forging to produce more and more comes into one's own owing to have better mechanical property, diversified structure.
Yet magnesiumalloy commonly used is a close-packed hexagonal structure, and the critical shearing stress of basal slip (CRSS) is far below non-basal slip, when being lower than 498K; Slip plane mainly is basal plane { 0001}; Slip direction is < 11-20 >, just has only independently slip system of a main slip plane and two, is out of shape mainly twin through the conical surface, crystal boundary slippage and waits and coordinate; Therefore room temperature drawing performance is very poor, has limited being widely used of wrought magnesium alloys.Therefore, improving the drawing performance of magnesium alloy plate, is the prerequisite and the guarantee of development magnesiumalloy plastic working means, is significant for the widely-used of wrought magnesium alloys product.
Summary of the invention
In view of this, the invention provides a kind of method of improving magnesium alloy plate drawing performance, can solve the unfavorable very poor problem of drawing performance that causes of grain orientation in the magnesium alloy plate deformation process, effectively improve the drawing performance of magnesium alloy plate.
The method of improving magnesium alloy plate drawing performance of the present invention, rolling to advance room temperature tensile or room temperature of magnesium alloy plate, making its deflection is 2% ~ 10%, stretches or rolling ends then carried out anneal to magnesium alloy plate.
Further, in the said anneal, annealing temperature is 250 ~ 400 ℃, and annealing time is 30 ~ 120 clocks;
Further, during said room temperature tensile, draw speed is 1 ~ 5mm/min;
Further, during said room temperature tensile, draw speed is 3mm/min;
Further, when said room temperature was rolling, roll speed was 1 ~ 10r/min;
Further, when said room temperature was rolling, roll speed was 3r/min.
Beneficial effect of the present invention is: the recrystallize theory is thought; When degree of deformation reaches 2% ~ 10%, have only the distortion of part crystal grain in the metal, be out of shape extremely inhomogeneous; Grain size differs greatly during recrystallize; Annex mutually easily and grow up, crystal grain is thick especially behind the recrystallize, and this degree of deformation is called critical degree of deformation.It has been generally acknowledged that, should avoid the processing under the critical degree of deformation in the production as far as possible.Yet the present invention has overcome above-mentioned technological prejudice, deforms in critical degree of deformation scope (2% ~ 10%) through stretching or the rolling magnesium alloy plate that makes; Carry out anneal subsequently; Acquisition has the magnesium alloy plate of big grain-size, and that the crystal grain of large-size is easy in deformation process is twin, the twin grain orientation that changed; Make the crystalline orientation that is unfavorable for slippage become favourable, utilize twin contribution to improve the drawing performance of magnesium alloy plate viscous deformation.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer, below will carry out detailed description to the preferred embodiments of the present invention.
Embodiment 1
With thickness is that the rolling magnesium alloy plate of 0.6mm places on the electronic universal experimental machine, and at room temperature along rolling direction tensile deformation 10%, draw speed is 3mm/min, 260 ℃ of annealing 60 minutes, takes out air cooling then.The grain-size of magnesium alloy plate after treatment is increased to 20.9 μ m by 7.5 μ m; Ys is reduced to 142.5Mpa by 169.7MPa, and yield tensile ratio reduces to 0.49 by 0.54, and work hardening exponent n value increases to 0.24 by 0.20; Plastic strain ratio r value reduces to 1.98 by 2.39; Erichsen number increases to 4.88mm by 3.18mm, has improved 53.5%, and the drawing performance improves.
Embodiment 2
With thickness is that the rolling magnesium alloy plate of 0.6mm places on the electronic universal experimental machine, and at room temperature along rolling direction tensile deformation 8%, draw speed is 3mm/min, 260 ℃ of annealing 120 minutes, takes out air cooling then.The grain-size of magnesium alloy plate after treatment is increased to 26.6 μ m by 7.5 μ m; Ys is reduced to 130.7Mpa by 169.7MPa, and yield tensile ratio reduces to 0.46 by 0.54, and work hardening exponent n value increases to 0.25 by 0.20; Plastic strain ratio r value reduces to 1.71 by 2.39; Erichsen number increases to 4.96mm by 3.18mm, has improved 56%, and the drawing performance improves.
Embodiment 3
With thickness is that the rolling magnesium alloy plate of 0.6mm places on the electronic universal experimental machine, and at room temperature along rolling direction tensile deformation 5%, draw speed is 3mm/min, 260 ℃ of annealing 90 minutes, takes out air cooling then.The grain-size of magnesium alloy plate after treatment is increased to 35.3 μ m by 7.5 μ m; Ys is reduced to 130.7Mpa by 169.7MPa, and yield tensile ratio reduces to 0.47 by 0.54, and work hardening exponent n value increases to 0.24 by 0.20; Plastic strain ratio r value reduces to 1.50 by 2.39; Erichsen number increases to 5.26mm by 3.18mm, has improved 65.4%, and the drawing performance improves.
Embodiment 4
With thickness is that the rolling magnesium alloy plate of 0.6mm places on the electronic universal experimental machine, and at room temperature along rolling direction tensile deformation 2%, draw speed is 3mm/min, 260 ℃ of annealing 30 minutes, takes out air cooling then.The grain-size of magnesium alloy plate after treatment is increased to 10.4 μ m by 7.5 μ m; Ys is reduced to 153.2Mpa by 169.7MPa, and yield tensile ratio reduces to 0.50 by 0.54, and work hardening exponent n value increases to 0.21 by 0.20; Plastic strain ratio r value reduces to 2.05 by 2.39; Erichsen number increases to 4.30mm by 3.18mm, has improved 35.2%, and the drawing performance improves.
Embodiment 5
With thickness is that the rolling magnesium alloy plate of 0.6mm places on the miniature precision milling train, and at room temperature along rolling direction rolling deformation 10%, roll speed is 3r/min, 260 ℃ of annealing 80 minutes, takes out air cooling then.The grain-size of magnesium alloy plate after treatment is increased to 21.3 μ m by 7.5 μ m; Ys is reduced to 139.6Mpa by 169.7MPa, and yield tensile ratio reduces to 0.47 by 0.54, and work hardening exponent n value increases to 0.23 by 0.20; Plastic strain ratio r value reduces to 1.92 by 2.39; Erichsen number increases to 4.91mm by 3.18mm, has improved 54.4%, and the drawing performance improves.
Embodiment 6
With thickness is that the rolling magnesium alloy plate of 0.6mm places on the miniature precision milling train, and at room temperature along rolling direction rolling deformation 8%, roll speed is 3r/min, 260 ℃ of annealing 120 minutes, takes out air cooling then.The grain-size of magnesium alloy plate after treatment is increased to 25.4 μ m by 7.5 μ m; Ys is reduced to 132.4Mpa by 169.7MPa, and yield tensile ratio reduces to 0.48 by 0.54, and work hardening exponent n value increases to 0.24 by 0.20; Plastic strain ratio r value reduces to 1.78 by 2.39; Erichsen number increases to 5.01mm by 3.18mm, has improved 57.5%, and the drawing performance improves.
Embodiment 7
With thickness is that the rolling magnesium alloy plate of 0.6mm places on the miniature precision milling train, and at room temperature along rolling direction rolling deformation 5%, roll speed is 3r/min, 260 ℃ of annealing 90 minutes, takes out air cooling then.The grain-size of magnesium alloy plate after treatment is increased to 36.5 μ m by 7.5 μ m; Ys is reduced to 128.4Mpa by 169.7MPa, and yield tensile ratio reduces to 0.45 by 0.54, and work hardening exponent n value increases to 0.24 by 0.20; Plastic strain ratio r value reduces to 1.48 by 2.39; Erichsen number increases to 5.19mm by 3.18mm, has improved 63.2%, and the drawing performance improves.
Embodiment 8
With thickness is that the rolling magnesium alloy plate of 0.6mm places on the miniature precision milling train, and at room temperature along rolling direction rolling deformation 2%, roll speed is 3r/min, 260 ℃ of annealing 30 minutes, takes out air cooling then.The grain-size of magnesium alloy plate after treatment is increased to 11.7 μ m by 7.5 μ m; Ys is reduced to 155.4Mpa by 169.7MPa, and yield tensile ratio reduces to 0.51 by 0.54, and work hardening exponent n value increases to 0.21 by 0.20; Plastic strain ratio r value reduces to 2.12 by 2.39; Erichsen number increases to 4.41mm by 3.18mm, has improved 38.7%, and the drawing performance improves.
The present invention makes magnesium alloy plate and belt in critical degree of deformation scope (2% ~ 10%) internal strain; Because the bigger energy storage of the inner generation of magnesium alloy plate in the cold deformation process; Recrystallize has taken place in sheet material inside in annealing process subsequently, and crystal grain is grown up unusually, thereby obtains to have the magnesium alloy plate of big grain-size; The crystal grain of large-size can promote the formation of twin in the deformation process; And twin (as 10-12}) and can cause that lattice rotates, the crystal grain that makes part be in hard orientation turns to soft orientation, thereby improves the drawing performance of magnesium alloy plate.Can find out from the foregoing description; The present invention can reduce ys, yield tensile ratio and the plastic strain ratio r value of magnesium alloy plate; Improve work hardening exponent n value and Erichsen number, improve the drawing performance of sheet material, have equipment simply, the working (machining) efficiency advantages of higher.Certainly, the annealing temperature among the present invention, draw speed and roll speed etc. are not limited to the foregoing description, and annealing temperature, draw speed and roll speed etc. in the conventional magnesiumalloy complete processing all are applicable to method of the present invention.
Explanation is at last; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although through invention has been described with reference to the preferred embodiments of the present invention; But those of ordinary skill in the art should be appreciated that and can make various changes to it in form with on the details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (6)
1. method of improving magnesium alloy plate drawing performance is characterized in that: rolling to advance room temperature tensile or room temperature of magnesium alloy plate, making its deflection is 2% ~ 10%, stretches or rolling ends then carried out anneal to magnesium alloy plate.
2. the method for improving magnesium alloy plate drawing performance according to claim 1 is characterized in that: in the said anneal, annealing temperature is 250 ~ 400 ℃, and annealing time is 30 ~ 120 clocks.
3. the method for improving magnesium alloy plate drawing performance according to claim 1 and 2 is characterized in that: during said room temperature tensile, draw speed is 1 ~ 5mm/min.
4. the method for improving magnesium alloy plate drawing performance according to claim 3 is characterized in that: during said room temperature tensile, draw speed is 3mm/min.
5. the method for improving magnesium alloy plate drawing performance according to claim 1 and 2 is characterized in that: when said room temperature was rolling, roll speed was 1 ~ 10r/min.
6. the method for improving magnesium alloy plate drawing performance according to claim 5 is characterized in that: when said room temperature was rolling, roll speed was 3r/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103333703A CN102392203A (en) | 2011-10-28 | 2011-10-28 | Method for improving stamping formability of magnesium alloy sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103333703A CN102392203A (en) | 2011-10-28 | 2011-10-28 | Method for improving stamping formability of magnesium alloy sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102392203A true CN102392203A (en) | 2012-03-28 |
Family
ID=45859581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103333703A Pending CN102392203A (en) | 2011-10-28 | 2011-10-28 | Method for improving stamping formability of magnesium alloy sheet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102392203A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103540881A (en) * | 2013-11-08 | 2014-01-29 | 中南大学 | Processing method for improving drawing and pressing asymmetry of magnesium alloy |
| CN104057264A (en) * | 2014-07-04 | 2014-09-24 | 重庆大学 | Magnesium alloy punch forming method |
| CN104404614A (en) * | 2014-12-29 | 2015-03-11 | 中南大学 | Preparation method of Al-Cu-Mg aluminum alloy monocrystal |
| CN105388174A (en) * | 2015-10-29 | 2016-03-09 | 上海交通大学 | Method for evaluating microcrack initiation of magnesium alloy |
| CN106048269A (en) * | 2016-07-25 | 2016-10-26 | 北京工业大学 | Method for preparing large nanocrystalline magnesium alloy through small deformation |
| CN108130496A (en) * | 2018-01-05 | 2018-06-08 | 江西理工大学 | A kind of preparation method of aluminium alloy macroscopic view coarse-grain and monocrystalline |
| CN108588603A (en) * | 2018-04-17 | 2018-09-28 | 重庆大学 | A kind of texture modification techniques and product promoting magnesium alloy extrusion sheet material temperature-room type plasticity |
| CN109182859A (en) * | 2018-08-20 | 2019-01-11 | 重庆科技学院 | A kind of method that composite deformation prepares high formability magnesium alloy plate |
| CN115927984A (en) * | 2022-11-28 | 2023-04-07 | 云南大学 | Method for improving room-temperature bending forming performance of magnesium alloy |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403080A (en) * | 2008-11-21 | 2009-04-08 | 北京工业大学 | Thermal treatment process for erbium-containing aluminum-magnesium-manganese wrought aluminium alloy |
| CN101492797A (en) * | 2009-01-16 | 2009-07-29 | 重庆大学 | Method for improving shaping property of magnesium alloy strip |
-
2011
- 2011-10-28 CN CN2011103333703A patent/CN102392203A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403080A (en) * | 2008-11-21 | 2009-04-08 | 北京工业大学 | Thermal treatment process for erbium-containing aluminum-magnesium-manganese wrought aluminium alloy |
| CN101492797A (en) * | 2009-01-16 | 2009-07-29 | 重庆大学 | Method for improving shaping property of magnesium alloy strip |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103540881A (en) * | 2013-11-08 | 2014-01-29 | 中南大学 | Processing method for improving drawing and pressing asymmetry of magnesium alloy |
| CN104057264A (en) * | 2014-07-04 | 2014-09-24 | 重庆大学 | Magnesium alloy punch forming method |
| CN104404614A (en) * | 2014-12-29 | 2015-03-11 | 中南大学 | Preparation method of Al-Cu-Mg aluminum alloy monocrystal |
| CN105388174A (en) * | 2015-10-29 | 2016-03-09 | 上海交通大学 | Method for evaluating microcrack initiation of magnesium alloy |
| CN105388174B (en) * | 2015-10-29 | 2018-05-01 | 上海交通大学 | A kind of method for evaluating magnesium alloy microcrack initiation |
| CN106048269A (en) * | 2016-07-25 | 2016-10-26 | 北京工业大学 | Method for preparing large nanocrystalline magnesium alloy through small deformation |
| CN106048269B (en) * | 2016-07-25 | 2018-02-23 | 北京工业大学 | A kind of method that small deformation amount prepares bulk nanocrystalline magnesium alloy |
| CN108130496A (en) * | 2018-01-05 | 2018-06-08 | 江西理工大学 | A kind of preparation method of aluminium alloy macroscopic view coarse-grain and monocrystalline |
| CN108130496B (en) * | 2018-01-05 | 2019-09-13 | 江西理工大学 | A kind of preparation method of aluminium alloy macroscopic view coarse-grain and monocrystalline |
| CN108588603A (en) * | 2018-04-17 | 2018-09-28 | 重庆大学 | A kind of texture modification techniques and product promoting magnesium alloy extrusion sheet material temperature-room type plasticity |
| CN109182859A (en) * | 2018-08-20 | 2019-01-11 | 重庆科技学院 | A kind of method that composite deformation prepares high formability magnesium alloy plate |
| CN115927984A (en) * | 2022-11-28 | 2023-04-07 | 云南大学 | Method for improving room-temperature bending forming performance of magnesium alloy |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102392203A (en) | Method for improving stamping formability of magnesium alloy sheet | |
| CN102002653B (en) | Method for preparing superhigh-purity aluminum fine grain high-orientation target | |
| CN106862272B (en) | Preparation method of high-strength high-ductility magnesium alloy plates | |
| Zhang et al. | Cold stamping formability of AZ31B magnesium alloy sheet undergoing repeated unidirectional bending process | |
| CN102409273B (en) | Method for weakening cardinal plane texture of magnesium alloy plate strip | |
| CN103898424B (en) | A kind of magnesium alloy grains method | |
| CN103045974B (en) | Hot working method for improving strength of wrought aluminium alloy and keeping plasticity of wrought aluminium alloy | |
| CN102127724B (en) | Method for preparing magnesium alloy plate strip with grain size in symmetric gradient distribution along plate thickness direction | |
| CN103882356B (en) | A kind of preparation method with superplastic deformation ability close grain magnesium alloy | |
| CN112719179B (en) | Forging method of TC1 titanium alloy bar | |
| CN107699830B (en) | Method that is a kind of while improving industrially pure titanium intensity and plasticity | |
| CN101660130A (en) | Method for preparing niobium sputtering target | |
| CN113235027B (en) | Deformed magnesium alloy plate with good matching of strength and plasticity and preparation method thereof | |
| KR20130137553A (en) | Titanium sheet and manufacturing method thereof | |
| CN108624830B (en) | Magnesium alloy structural part and extrusion preparation method thereof | |
| CN102000695B (en) | Rolling method of sheet metal | |
| CN111570512A (en) | High-toughness magnesium alloy plate and laminating and rolling preparation method thereof | |
| CN101871084B (en) | Method for manufacturing low ductility anisotropy rolling aluminum alloy sheet | |
| CN109317679B (en) | Production method of aluminum alloy sheet | |
| CN101474745B (en) | Method for preparing AZ31B magnesium alloy pressing sheet material | |
| CN109136804B (en) | Preparation method of high-toughness superfine two-phase lamellar structure QAL10-4-4 aluminum bronze alloy plate | |
| CN103911571A (en) | Method for improving plasticity of magnesium alloy sheets | |
| CN111394669A (en) | Manufacturing method for reducing anisotropy of pure titanium thin plate strip for deep drawing | |
| CN112281093A (en) | Preparation process of high-performance magnesium-lithium alloy thin strip | |
| Huang et al. | Tensile properties and microstructure of AZ31B magnesium alloy sheet processed by repeated unidirectional bending |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120328 |