CN106756682B - A kind of magnesium alloy grains method - Google Patents
A kind of magnesium alloy grains method Download PDFInfo
- Publication number
- CN106756682B CN106756682B CN201611203889.9A CN201611203889A CN106756682B CN 106756682 B CN106756682 B CN 106756682B CN 201611203889 A CN201611203889 A CN 201611203889A CN 106756682 B CN106756682 B CN 106756682B
- Authority
- CN
- China
- Prior art keywords
- twin
- directions
- crystal grain
- deformation
- plate
- 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.)
- Active
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
Abstract
The invention discloses a kind of magnesium alloy grains method, including step：Design positive eight prisms plate, select specific direction to carry out multidirectional combination, then carry out along the combination circulating multidirectional deformation at room temperature, accumulated deformation to a certain extent, then carries out the annealing of medium temperature short time.Plate uses specific direction combined deformation, by introducing first compression twin, second-compressed twin and one-off drawing twin, give full play to the segmentation that intersects between different twins and carry out crystal grain thinning, in annealing process, the storage of these twin internal distortions can be high, it is possible to provide abundant nucleation site, so that uniform recrystallization little crystal grain can be obtained in a short time, and the basal plane texture of magnesium alloy plate is weakened, so that the intensity and processability of magnesium alloy plate be greatly improved.
Description
Technical field
The present invention relates to a kind of magnesium alloy grains method.
Background technology
Magnesium and magnesium alloy have many advantages, such as light, thermal conductivity is good, damping shock absorption, electromagnetic shielding, have wide
Application prospect.However, the close-packed hexagonal having due to magnesium alloy（HCP）The characteristics of crystal structure, at room temperature independent slip-system
It is few, cause temperature-room type plasticity low, easily form basal plane texture, forming ability is poor, it has also become hinder magnesium alloy materials large-scale application
Bottleneck problem.
Traditional magnesium alloy forged method deformation at room temperature energy force difference, it usually needs deformed, and be aided with high temperature
Multiple intermediate annealing, causes complex process, of high cost, the tissue crystallite dimension obtained in the micron-scale not more than, greatly
Constrain the production and application of magnesium alloy materials.Therefore, one kind is developed to close to improve magnesium by microstructure and texture controlling
The microstructure of gold, so that the new method for improving magnesium alloy temperature-room type plasticity deformability becomes the task of top priority of engineer application.
The content of the invention
It is an object of the invention in view of the shortcomings of the prior art, providing a kind of magnesium alloy grains method.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of magnesium alloy grains method, specifically includes following steps：
（1）Processed according to GB/T5154-2003 standard productions, after semi-continuous casting, heat is carried out between 350 DEG C -450 DEG C
Cogging processing is rolled, then in 400 DEG C of annealing smoothings；Material has stronger basal plane texture at this time, and most of crystal grain orientation is parallel
In the rolling normal direction of plate（ND）；
（2）Positive eight prisms plate is designed on hot rolling cogging plate, and 5 different deformation directions are set, if plate
Rolling normal direction is ND, and rolling to the transverse direction for RD, plate for plate is TD, and the direction with the horizontal angle at 45 ° of plate is 45TD, with plate
Another direction at the horizontal angle at 45 ° of material is 45TD '；
（3）Machining deformation makes positive eight prisms plate, and sets the loop direction of deformation, and 5 deformation directions one follow
Ring group is closed：ND- RD-45TD-TD-45TD’；First along ND Direction distortions, substantial amounts of first compression twin and second-compressed are produced
Twin so that the lamellar orientation that first compression twin occurs in crystal grain deviates 56 ° of ND directions, and the lamella of second-compressed twin occurs
Orientation deviates 38 ° of ND directions, and twin crystal grain does not occur and is also retained in ND directions for part；Then along RD Direction distortions so that ND
The portion crystal generation stretching in direction is twin to go to RD directions, and mutual with the primary and secondary compression twin of last time deformation generation
Intersect, primary segmentation original grain；Again along 45TD Direction distortions so that the portion crystal in ND directions occurs to stretch twin go to
45TD directions so that primary and secondary compression twin occurs for the crystal grain in RD directions, and newly generated twin and original twin are again
Intersect segmentation crystal grain thinning；Then along TD Direction distortions so that the crystal grain in ND directions and RD directions occurs stretching twin and turns
To TD directions so that primary and secondary compression twin occurs for the crystal grain in 45TD directions, and stretching twin and compression twin are mutual again
Effect segmentation crystal grain；Finally along 45TD ' Direction distortions so that the crystal grain in ND and 45TD directions occurs stretching twin and goes to 45TD '
Direction so that primary and secondary compression twin occurs for the crystal grain in RD and TD directions, compression twin that the different distortion stage produces and
Stretching twin intersects, and splits crystal grain thinning, completes a circulation；Since twin lamellae is relatively narrow, especially in different twins
The position stress concentration that lamella intersects is obvious, and deformation storage can be larger, and tying again for abundance is provided for the annealing of next step
Brilliant driving force；
（4）Repeat step（3）In circulation 5 ~ 20 times；
（5）Through step（4）Multiple circulation multidirectional deformation sample, when cumulative deformation reaches 200%-300%, then into
Row annealing, obtains uniformly tiny recrystal grain.
Step（3）In mode of texturing at room temperature using Uniaxial Compression or unidirectional forging.
Step（3）In rate of deformation be 1mm/min ~ 10mm/min.
Step（5）Middle annealing temperature is 200-250 DEG C, and annealing time is 20-30 minutes.
Step（5）The recrystallization crystal particle dimension obtained after middle annealing is 700nm.
The beneficial effects of the present invention are：Magnesium alloy grains method provided by the invention, plate use specific direction
Combined deformation, by introducing first compression twin, second-compressed twin and one-off drawing twin, gives full play between different twins
The segmentation that intersects carrys out crystal grain thinning, and in annealing process, the storage of these twin internal distortions can be high, it is possible to provide abundant forming core
Position, so as to can obtain uniform recrystallization little crystal grain in a short time, and weakens the basal plane texture of magnesium alloy plate, so that pole
The big intensity and processability for improving magnesium alloy plate.
Brief description of the drawings
Fig. 1 is the sheet deformation direction schematic diagram one of positive eight prisms plate；
Fig. 2 is the sheet deformation direction schematic diagram two of positive eight prisms plate；
In fig. 1 and 2：Direction 1 represents the rolling normal direction of plate（ND）, direction 2 represent plate roll to（RD）, direction
3 represent the transverse direction of plate（TD）, direction 4 represents the direction 45TD with the horizontal angle at 45 ° of plate, and direction 5 represents horizontal with plate
Another direction 45TD ' at angle at 45 °.
Embodiment
Below in conjunction with specific embodiment, the present invention will be further described, but the present invention is not limited only to these embodiments.
Embodiment
A kind of magnesium alloy grains method, specifically includes following steps：
（1）Processed according to GB/T5154-2003 standard productions, after semi-continuous casting, heat is carried out between 350 DEG C -450 DEG C
Cogging processing is rolled, then in 400 DEG C of annealing smoothings；
（2）Design positive eight prisms plate：Positive eight prisms plate is designed on hot rolling cogging plate, makes it have 5 differences
Deformation direction, as shown in Figure 1, direction 1 represent plate rolling normal direction（ND）, direction 2 represent plate roll to（RD）, direction
3 represent the transverse direction of plate（TD）, direction 4 represents the direction 45TD with the horizontal angle at 45 ° of plate, and direction 5 represents horizontal with plate
Another direction 45TD ' at angle at 45 °；
（3）Multiple deformation direction combinations：5 deformation directions, one circulation combination：ND-RD-45TD-TD-45TD’；First
Along ND Direction distortions, substantial amounts of first compression twin and second-compressed twin are produced so that first compression twin occurs in crystal grain
Lamellar orientation deviate 56 ° or so of ND directions, the lamellar orientation that second-compressed twin occurs deviates 38 ° or so of ND directions, part
Twin crystal grain does not occur and is also retained in ND directions；Then along RD Direction distortions so that the portion crystal in ND directions stretches
It is twin to go to RD directions, and the primary and secondary compression twin produced with last time deformation intersects, primary segmentation original grain；
Again along 45TD Direction distortions so that the portion crystal generation stretching in ND directions is twin to go to 45TD directions so that the crystalline substance in RD directions
Primary and secondary compression twin occurs for grain, and newly generated twin intersects again with original twin splits crystal grain thinning；Connect
Along TD Direction distortions so that the crystal grain in ND directions and RD directions occurs stretching twin and goes to TD directions so that 45TD directions
Primary and secondary compression twin occurs for crystal grain, and stretching twin and compression twin interact split crystal grain again；Finally along 45TD '
Direction distortion so that the crystal grain in ND and 45TD directions occurs stretching twin and goes to 45TD ' directions so that the crystal grain in RD and TD directions
The primary and secondary compression twin of generation, the compression twin and stretching twin that the different distortion stage produces intersect, segmentation refinement
Crystal grain, completes a circulation；Above-mentioned mode of texturing is at room temperature using Uniaxial Compression or unidirectional forging, rate of deformation 1mm/
min~10mm/min；
（4）Repeat step（3）In circulation 5 ~ 20 times；
（5）Medium annealing processing：By step（4）The repeatedly sample of circulation multidirectional deformation, when cumulative deformation reaches
During 200%-300%, the annealing of 20-30 minutes is carried out at 200-250 DEG C, uniformly tiny recrystal grain can be obtained, is put down
Equal crystallite dimension can reach 700nm.
Specific embodiment is given below：
Embodiment one：
The size for positive eight prism removed from hot rolling slab is：Upper and lower surface is octagon, length of side 200mm；Thickness
Also it is 200mm.Multidirectional circulation forging is carried out at room temperature, and strain rate 1mm/min a, loop direction is combined as：ND-RD-
45TD-TD-45TD’.First along ND Direction distortions 10%, then along RD Direction distortions 4%, then along 45TD Direction distortions 8%, then
Along TD Direction distortions 5%, finally along 45TD ' Direction distortions 5%, a circulation is completed.One deformation combination can add up deformation 32%.
This technique is recycled 10 times, and it is 320% to add up deflection.The heat treatment of medium temperature short time, annealing temperature are carried out to deformed sample
For 200 DEG C, annealing time is 25 minutes, and the recrystallization equiaxed grain structure that crystallite dimension is 650-750nm can be obtained after annealing.
Embodiment two：
The size for positive eight prism removed from hot rolling slab is：Upper and lower surface is octagon, length of side 200mm；Thickness
Also it is 200mm.Multidirectional circulation forging is carried out at room temperature, and strain rate 5mm/min a, loop direction is combined as：ND-RD-
45TD-TD-45TD’.First along ND Direction distortions 12%, then along RD Direction distortions 5%, then along 45TD Direction distortions 10%, then
Along TD Direction distortions 5%, finally along 45TD ' Direction distortions 5%, a circulation is completed.One deformation combination can add up deformation 37%.
This technique is recycled 7 times, and it is 259% to add up deflection.The heat treatment of medium temperature short time, annealing temperature are carried out to deformed sample
For 250 DEG C, annealing time is 20 minutes, and the recrystallization equiaxed grain structure that crystallite dimension is 700-800nm can be obtained after annealing.
Embodiment three：
The size for positive eight prism removed from hot rolling slab is：Upper and lower surface is octagon, length of side 200mm；Thickness
Also it is 200mm.Multidirectional circulation forging is carried out at room temperature, and strain rate 10mm/min a, loop direction is combined as：ND-RD-
45TD-TD-45TD’.First along ND Direction distortions 15%, then along RD Direction distortions 5%, then along 45TD Direction distortions 5%, then
Along TD Direction distortions 10%, finally along 45TD ' Direction distortions 5%, a circulation is completed.One deformation combination can add up deformation 40%.
This technique is recycled 5 times, and it is 200% to add up deflection.The heat treatment of medium temperature short time, annealing temperature are carried out to deformed sample
For 200 DEG C, annealing time is 30 minutes, and the recrystallization equiaxed grain structure that crystallite dimension is 600-800nm can be obtained after annealing.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, should all belong to the covering scope of the present invention.
Claims (4)
- A kind of 1. magnesium alloy grains method, it is characterised in that：Specifically include following steps：（1）According to GB/T5154-2003 standard productions process, after semi-continuous casting, between 350 DEG C -450 DEG C carry out hot rolling open Base processing, then in 400 DEG C of annealing smoothings；（2）Positive eight prisms plate is designed on hot rolling cogging plate, and 5 different deformation directions are set, if the rolling of plate Normal direction is ND, and rolling to the transverse direction for RD, plate for plate is TD, and the direction with the horizontal angle at 45 ° of plate is 45TD, horizontal with plate It is 45TD ' to another direction at angle at 45 °；（3）Machining deformation makes positive eight prisms plate, and sets the loop direction of deformation, 5 deformation directions, one circulation group Close：ND- RD-45TD-TD-45TD’；First along ND Direction distortions, produce substantial amounts of first compression twin and second-compressed is twin It is brilliant so that the lamellar orientation that first compression twin occurs in crystal grain deviates 56 ° of ND directions, and the lamella that second-compressed twin occurs takes To 38 ° of ND directions are deviateed, twin crystal grain does not occur and is also retained in ND directions for part；Then along RD Direction distortions so that ND side To portion crystal occur that stretching is twin to go to RD directions, and the primary and secondary compression twin produced with last time deformation is mutually handed over Fork, primary segmentation original grain；Again along 45TD Direction distortions so that the portion crystal generation stretching in ND directions is twin to go to 45TD Direction so that primary and secondary compression twin occurs for the crystal grain in RD directions, and newly generated twin is mutual again with original twin Cross-partition crystal grain thinning；Then along TD Direction distortions so that the crystal grain in ND directions and RD directions occurs stretching twin and goes to TD Direction so that primary and secondary compression twin occurs for the crystal grain in 45TD directions, and stretching twin and compression twin interact again Split crystal grain；Finally along 45TD ' Direction distortions so that the crystal grain in ND and 45TD directions occurs stretching twin and goes to 45TD ' directions, So that primary and secondary compression twin occurs for the crystal grain in RD and TD directions, compression twin and stretch twin that the different distortion stage produces Crystalline substance intersects, and splits crystal grain thinning, completes a circulation；（4）Repeat step（3）In circulation 5 ~ 20 times；（5）Through step（4）Multiple circulation multidirectional deformation sample, when cumulative deformation reaches 200%-300%, then moved back Fire, obtains uniformly tiny recrystal grain；The recrystallization crystal particle dimension obtained after annealing is 700nm.
- 2. magnesium alloy grains method according to claim 1, it is characterised in that：Step（3）In mode of texturing be At room temperature using Uniaxial Compression or unidirectional forging.
- 3. magnesium alloy grains method according to claim 1, it is characterised in that：Step（3）In rate of deformation be 1mm/min~10mm/min。
- 4. magnesium alloy grains method according to claim 1, it is characterised in that：Step（5）Middle annealing temperature is 200-250 DEG C, annealing time is 20-30 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611203889.9A CN106756682B (en) | 2016-12-23 | 2016-12-23 | A kind of magnesium alloy grains method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611203889.9A CN106756682B (en) | 2016-12-23 | 2016-12-23 | A kind of magnesium alloy grains method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106756682A CN106756682A (en) | 2017-05-31 |
| CN106756682B true CN106756682B (en) | 2018-05-04 |
Family
ID=58897867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611203889.9A Active CN106756682B (en) | 2016-12-23 | 2016-12-23 | A kind of magnesium alloy grains method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106756682B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110129695B (en) * | 2019-05-30 | 2020-07-31 | 重庆科技学院 | Method for preparing high-performance magnesium alloy plate |
| CN110172654A (en) * | 2019-05-31 | 2019-08-27 | 南京理工大学 | A method of improving magnesium alloy bending forming performance |
| CN113118233A (en) * | 2021-04-19 | 2021-07-16 | 太原理工大学 | Continuous production equipment for presetting stretching twin crystals in plate |
| CN113215506B (en) * | 2021-04-27 | 2022-07-12 | 扬州大学 | Quantitative preparation method of three-texture magnesium alloy |
| CN113881835A (en) * | 2021-10-26 | 2022-01-04 | 扬州大学 | Preparation method of magnesium alloy capable of regulating and controlling size of multiple grains |
| CN114029356B (en) * | 2021-11-09 | 2023-09-29 | 安徽工程大学 | Preparation method of superfine crystal/nanocrystalline layered microstructure stainless steel plate |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101463454B (en) * | 2009-01-16 | 2010-06-16 | 中南大学 | Method for preparing bulk nano/superfine crystal grain magnesium alloy by twinning deformation |
| CN102127724B (en) * | 2010-11-11 | 2012-06-06 | 中南大学 | Method for preparing magnesium alloy plate strip with grain size in symmetric gradient distribution along plate thickness direction |
| CN101985729B (en) * | 2010-11-18 | 2012-11-07 | 重庆大学 | Method for refining crystal grains of magnesium alloy plate |
| CN104726805B (en) * | 2015-04-07 | 2016-08-17 | 福州大学 | A kind of magnesium alloy plate manufacturing process |
-
2016
- 2016-12-23 CN CN201611203889.9A patent/CN106756682B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106756682A (en) | 2017-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106756682B (en) | A kind of magnesium alloy grains method | |
| CN106868436B (en) | Manufacturing method for producing high-temperature alloy GH4169 fine-grained bar through rapid-diameter forging combination | |
| CN109371344B (en) | Forging process of GH4169 alloy bar | |
| CN103938137A (en) | Method for changing structure uniformity of large-specification titanium alloy bar | |
| CN108057829B (en) | A kind of forging method improving titanium alloy forging stock structural homogenity | |
| CN112676503B (en) | Forging processing method for TC32 titanium alloy large-size bar | |
| CN107824731A (en) | A kind of Ti55 titanium alloy large sizes bar forging method | |
| CN112719179B (en) | Forging method of TC1 titanium alloy bar | |
| CN106944799A (en) | AQ80M magnesium alloys annular element squeezes forging rolling integrated technique | |
| CN106399886B (en) | A kind of preparation method of TC4 Fine Grain Ti Alloy thin plate | |
| CN105855345A (en) | Magnesium alloy plate two-way circulation bending composite deformation method and die device | |
| CN105234173A (en) | Rolling machining method for improving microstructure texture and mechanical property of magnesium alloy sheet strip | |
| CN110508731A (en) | A kind of forging method improving TC4 titanium alloy large-scale forging structural homogenity | |
| CN113664063A (en) | Preparation method of copper-molybdenum-copper laminated composite material | |
| CN111389916A (en) | Gradient tissue regulation and control method based on cross variable thickness rolling | |
| CN110438422B (en) | Heat treatment method for additive manufacturing of 2219 aluminum alloy | |
| CN108866401A (en) | A kind of manufacturing method of the aluminium alloy strips of automobile decoration | |
| CN111495970A (en) | Rolling method for reducing surface cracking of TC4 titanium alloy smelted in EB (electron beam) furnace | |
| CN106994583A (en) | The manufacture method of Mg alloy thin wall forging-ring | |
| CN106544608B (en) | A kind of manufacturing process of the thick fine grain magnesium alloy with high strength and ductility forging of spy | |
| CN107470357A (en) | A kind of low carbon steel rolling and control cooling means | |
| CN107497982A (en) | A kind of technique for being used to improve footpath forging forging end forging permeability | |
| CN104726805B (en) | A kind of magnesium alloy plate manufacturing process | |
| CN108906890B (en) | A kind of cold-rolling method of beta-titanium alloy thin plate | |
| CN105586553A (en) | Magnesium alloy stepped cooling multi-direction forging process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |