CN105039881B - A kind of magnesium alloy sheet forming property ameliorative way based on twinning deformation - Google Patents
A kind of magnesium alloy sheet forming property ameliorative way based on twinning deformation Download PDFInfo
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Abstract
The present invention provides a kind of magnesium alloy sheet forming property ameliorative way based on twinning deformation, belongs to non-ferrous metal plastic working field.Magnesium alloy sheet forming property ameliorative way of the invention based on twinning deformation activation stretching Mechanism of Deformation Twin, changes the basal plane texture of thin plate, and then improve the forming property of sheet material by applying compression in plane to magnesium alloy sheet.This method comprises the following steps：1) Compressional buckling mould prepares in plane strain mould or anti-plane；2) compression in the plane of magnesium alloy sheet is carried out using above-mentioned mould；3) sheet material Jing Guo predeformation is made annealing treatment, strain hardening effect is eliminated, so as to obtain the magnesium alloy sheet that forming property is improved.The magnesium alloy sheet basal plane texture treated by the method provided by the present invention is significantly changed, and forming property significantly improves, so as to provide Reliable guarantee for the follow-up deep processing of magnesium alloy sheet.
Description
Technical field
The present invention relates to non-ferrous metal plastic working field, more particularly to magnesium alloy sheet forming property ameliorative way.
Background technology
Magnesium alloy has the characteristics that specific strength is high, capability of electromagnetic shielding is good, damping characteristics are excellent, in automobile, aviation
The fields such as space flight, national defence, electronic communication have huge application potential.Most of magnesium alloys are close-packed hexagonal structure (HCP), room
The independent slip-system (twin system) easily started under temperature is less, is limited to basal slip system and stretches twin system, is a kind of room temperature modeling
The poor material of property.In addition, the magnesium alloy plate prepared by the technique such as rolling often has stronger basal plane texture, and basal plane
Texture is unfavorable for starting for basal slip system during deformation after unloading (such as Pressing Deformation), so as to reduce further magnesium alloy
The room temperature forming property of sheet material.The method that scholars propose a variety of decrease basal plane texture, such as multi-pass bend and waited logical
Road rolls, but these methods are mainly based upon dislocation movement by slip, and generally requiring multi-pass process and moderate finite deformation amount could be
Weaken the basal plane texture of magnesium alloy plate to a certain extent.
Stretch it is twin be magnesium alloy a kind of important Plastic Deformation Mechanism.When stretching twin be activated, the C axles of crystal grain will
86 ° of rotation, this just changed dramatically in crystal grain orientation.Therefore, the twinning deformation regulation and control magnesium alloy plate of magnesium alloy can be utilized
Texture.But twin is a kind of polarity deformation mechanism, i.e., only can be just activated under specific stress or strain regime, such as
Stretch it is twin only crystal grain C direction of principal axis by tension or occur stretcher strain when can just occur.For magnesium alloy sheet,
It is twin, it is necessary to planar implement compression to activate stretching.However, plane internal pressure stress easily causes thin plate bending to lose
Surely, compression in plane can not be realized, this cause people have ignored in the past time utilize twinning deformation regulation and control magnesium
Latten texture method.
The content of the invention
Present invention aim to address in existing magnesium alloy sheet forming property ameliorative way, because being based on sliding deformation machine
System and need to implement complicated large deformation, and the problem of forming property improvement is extremely limited.
To realize that the technical scheme that the object of the invention uses is a kind of such, magnesium alloy sheet based on twinning deformation
Forming property ameliorative way, comprises the following steps：
1) a set of plane strain mould is selected；
2) at least one piece of magnesium alloy sheet is obtained；
3) magnesium alloy sheet described in step 2) is placed in plane strain mould；When magnesium alloy sheet is more than one piece, this
A little thin plates are superimposed together.
Compressed in carry out plane to magnesium alloy sheet, bring it about twinning deformation；
4) magnesium alloy sheet (sheet material after precompressed compression deformation) handled by step 3) is made annealing treatment.
Specifically the step of is：
S1) collect and either process a set of Plane Strain Compression mould or a set of can prevent compressive instability in sheet plane
Mould；
S2 the bulk sample for being dimensioned for the mould in step S1, block sample) are cut from magnesium alloy sheet to be processed
Four sides of product are respectively parallel to plate rolling direction (RD to) and laterally (TD to)；
S3 the mould in step S1) is utilized to implement compression in a certain amount of plane to the bulk sample in step S2；
S4) sheet material after precompressed compression deformation in step S3 is made annealing treatment, strain hardening effect is eliminated, so as to obtain
The light sheet products that basal plane texture attenuation, Plastic Forming performance are improved.
Further, compression direction can be along rolling direction, or transverse direction, or elder generation in plane described in step S3
Rolling direction is again laterally, then or first horizontal rolling direction again.
Further, compress variation is less than 6% in plane described in step S3.
Further, compression can be directed to a piece of bulk sample in plane described in step S3, can also be directed to several bulks
Sample is implemented simultaneously.
Further, the annealing region in step S4 is between 200-300 °.
Beneficial effects of the present invention：
The method provided by the invention for improving magnesium alloy sheet forming property, it make use of stretching is twin can significantly change magnesium conjunction
The grain-oriented characteristic of gold, thin plate basal plane texture is can significantly modify by implementing simple, small deformation amount compression, from
And the magnesium alloy sheet that forming property significantly improves is obtained, provide Reliable guarantee for the follow-up deep processing of magnesium alloy sheet.
Brief description of the drawings
Fig. 1 is the plane strain mould schematic diagram selected by the present invention；
Fig. 2 is the block magnesium alloy sample schematic diagram of the present invention；
Fig. 3 is compression schematic diagram in the midplane of embodiment 1, while is also first stage plane internal pressure in embodiment 2
Compression deformation schematic diagram；
Fig. 4 is compression schematic diagram in second stage plane in embodiment 2；
Fig. 5 is the microstructure comparison diagram of sheet material after original plate pre-processes with embodiment 1 and embodiment 2；
Fig. 6 is (0001) face pole figure comparison diagram of sheet material after original plate pre-processes with embodiment 1 and embodiment 2；
Fig. 7 is the cupping experimental result comparison diagram of sheet material after original plate pre-processes with embodiment 1 and embodiment 2.
Embodiment
With reference to embodiment, the invention will be further described, but should not be construed the above-mentioned subject area of the present invention only
It is limited to following embodiments.Without departing from the idea case in the present invention described above, according to ordinary skill knowledge and used
With means, various replacements and change are made, all should be included within the scope of the present invention.
Embodiment 1：
A kind of magnesium alloy sheet forming property ameliorative way based on twinning deformation, it is characterised in that comprise the following steps：
1) a set of Plane Strain Compression mould for being suitable for sheet material to be processed is either processed in collection or a set of energy prevention is thin
The mould of Compressional buckling in plate plane, as shown in Figure 1.
What deserves to be explained is Fig. 1 provides a kind of mould for realizing the object of the invention, the mould includes upper die and lower die.
The upper mould is made up of orthogonal horizontal plate and vertical plate；The vertical cross section of the upper mould is " T-shaped " plane；It is described
The upper end of lower mould is provided with rectangular channel；The side of lower mould is run through at the both ends of the rectangular channel in the horizontal direction；The upper mould it is vertical
The rectangular channel of plate and lower mould agrees with；Thin plate sample (one or more is stacked) can be fully accommodated in groove by the rectangular channel
It is interior.
2) bulk sample is cut from magnesium alloy sheet (thickness 2.2mm) to be processed；As shown in Fig. 2 the present embodiment institute
The bulk sample cut is rectangle sample, and its four side is respectively parallel to rolling direction (RD) and transverse direction (TD)；What deserves to be explained is
" selection is suitable for the mould of sheet material to be processed " described in step 1), be after the determination of sheet metal thickness size, then select it is suitable
The mould of size, ensure that sheet material can be placed in mould as shown in Figure 3, will not unstability when being compressed.
3) kollag, this reality are added on the working face (i.e. the contact surface of sample and rectangular channel) of plane strain mould
Apply example and use polytetrafluoroethylene film；Monolithic or polylith bulk sample are placed on working face.Specimen in use is three in Fig. 3 and 4
It is placed in after the overlapping of block rectangle sample in mould；
4) compression is carried out along the horizontal of sample, as shown in figure 3, compress variation is 2.5%；
5) sample after compression being made annealing treatment, annealing temperature is 260 DEG C, annealing time 1h, afterwards
The thin plate improved to forming property, that is, eliminate strain hardening effect, and acquisition basal plane texture attenuation, Plastic Forming performance improve thin
Panel products.
Identical annealing is carried out to original plate (thickness is 2.2 magnesium alloy sheet) simultaneously, to be used as follow-up reality
Control group in testing.
Embodiment 2：
The basic step of the present embodiment is simply compressed from both direction, comprised the following steps with embodiment 1：
1) a set of plane strain mould is selected；As shown in figure 1, the Plane Strain Compression mould includes upper die and lower die.
The upper mould is made up of orthogonal horizontal plate and vertical plate；The vertical cross section of the upper mould is " T-shaped " plane；It is described
The upper end of lower mould is provided with rectangular channel；The side of lower mould is run through at the both ends of the rectangular channel in the horizontal direction；The upper mould it is vertical
The rectangular channel of plate and lower mould agrees with.
2) bulk sample is cut from magnesium alloy sheet (thickness 2.2mm same as Example 1) to be processed；Such as Fig. 2
Shown, the bulk sample that the present embodiment is cut is rectangle sample, and its four side is respectively parallel to rolling direction (RD) and transverse direction
(TD)；
3) kollag, such as polytetrafluoroethylene film are added on the working face of plane strain mould；By monolithic or more
Block bulk sample is placed on working face, and specimen in use is the combination of three pieces of rectangle samples in the present embodiment；
4) first stage compression is carried out along the horizontal of sample, as shown in figure 3, compress variation is 2.5%；
5) sample after first stage compression is taken out, placed into after being rotated by 90 ° in plane strain mould, along sample
Rolling direction carry out second stage compression, as shown in figure 4, compress variation be 2%；
6) sample after two benches precompressed compression deformation is made annealing treatment, 260 DEG C of annealing temperature, annealing time is
1h, the thin plate of forming property improvement is obtained afterwards, that is, eliminate strain hardening effect, obtain basal plane texture attenuation, plastic formability
The light sheet products that can be improved.
Experimental result：
Magnesium alloy sheet sample to the original plate in above-described embodiment 1 and embodiment 2 and by pretreatment is carried out
Microstructure characterizes, as a result as shown in Figure 5.From figure 5 it can be seen that by pretreatment in above-described embodiment 1 and embodiment 2
The crystallite dimension of magnesium alloy sheet sample will be significantly greater than original plate crystallite dimension, and this is due to that length is recrystallized in annealing process
Big result.It also can be observed to stretch feather organization on a small quantity in the microstructure of TD compressed sheets from figure, this just illustrates pre-
It is really twin there occurs stretching in compression process.And twin group can not be found in figure in the microstructure of TD＆RD compressed sheets
Knit, because by two stage compression, the deflection of accumulation is big, and there occurs perfect recrystallization in annealing process.
Magnesium alloy sheet to the original plate (control group) in above-described embodiment 1 and embodiment 2 and by pretreatment
Sample carries out texture test, as a result as shown in Figure 6.It can be found that being deformed in embodiment 1 by stage precommpression from Fig. 6
Sample in portion crystal C axles ({ 0001 } direction) toward lateral deflection, and the sample in embodiment 2 Jing Guo two benches compression
For the C axles of a part of crystal grain toward lateral deflection, the C axles for separately having portion crystal are inclined to rolling direction in product.The deflection angle of above-mentioned C axles
All meet the anglec of rotation of crystal grain when stretching twin activation, there occurs twin change for magnesium alloy sheet during illustrating precompression treatment
Shape.Contrast original plate and pass through precompressed sheet material pole figure, it can be found that precompressed compression deformation changed dramatically in magnesium alloy thin
The basal plane texture of plate.
The other magnesium alloy to the original plate (control group) in embodiment 1 and embodiment 2 and by pretreatment respectively
Thin plate sample carries out room temperature Erichsen test, as a result as shown in Figure 7.It can be found that sheet material by precompression treatment from figure
Erichsen number is apparently higher than original plate, and the sample Erichsen number wherein in embodiment 1 by stage precommpression deformation is compared with original plate
Material improves 34%, and improves 50% compared with original plate by the sheet material Erichsen number of two benches precompression treatment in embodiment 2.
From above-mentioned texture test result and Erichsen number test result it can be found that being treated by the method provided by the present invention
Magnesium alloy sheet basal plane texture significantly changed, forming property significantly improves, so as to follow-up for magnesium alloy sheet
Deep processing provides Reliable guarantee.
Claims (2)
1. a kind of magnesium alloy sheet forming property ameliorative way based on twinning deformation, it is characterised in that comprise the following steps：
1) a set of Plane Strain Compression mould for being suitable for sheet material to be processed is either processed in collection or a set of thin plate that can prevent is put down
The mould of Compressional buckling in face；
The mould includes upper die and lower die；
The upper mould is made up of orthogonal horizontal plate and vertical plate；The vertical cross section of the upper mould is " T-shaped " plane；
The upper end of the lower mould is provided with rectangular channel；The side of lower mould is run through at the both ends of the rectangular channel in the horizontal direction；
The rectangular channel of the vertical plate of the upper mould and lower mould agrees with；The thin plate that the rectangular channel can stack one or more
Sample is fully accommodated in groove；
2) bulk sample is cut from magnesium alloy sheet to be processed；
The bulk sample cut is rectangle sample, and its four side is respectively parallel to rolling direction and transverse direction；
After the determination of sheet metal thickness size, then the mould of suitable dimension is selected, ensure that sheet material can be placed in mould, when being compressed
Will not unstability；
3) kollag is added on the working face of plane strain mould；Monolithic or polylith bulk sample are placed on working face
On；
4) compression is carried out along the horizontal of sample, the compress variation is 1%-5.5%；
5) sample after compression is made annealing treatment, annealing temperature is 200-300 DEG C, obtains the thin of forming property improvement
Plate, that is, strain hardening effect is eliminated, obtain basal plane texture attenuation, the light sheet products that Plastic Forming performance improves.
2. a kind of magnesium alloy sheet forming property ameliorative way based on twinning deformation, it is characterised in that comprise the following steps：
1) a set of plane strain mould is selected；The Plane Strain Compression mould includes upper die and lower die；
The upper mould is made up of orthogonal horizontal plate and vertical plate；The vertical cross section of the upper mould is " T-shaped " plane；
The upper end of the lower mould is provided with rectangular channel；The side of lower mould is run through at the both ends of the rectangular channel in the horizontal direction；On described
The rectangular channel of the vertical plate of mould and lower mould agrees with；
2) bulk sample is cut from magnesium alloy sheet to be processed；The bulk sample is rectangle sample, and its four side is put down respectively
Row is in rolling direction and transverse direction；
3) kollag is added on the working face of plane strain mould, monolithic or polylith bulk sample is placed on working face
On；
4) first carry out compression along the horizontal of sample, then carry out compression along the rolling direction of sample；The plane implemented
Interior compress variation scope is 1%-5.5%；
5) sample after two benches precompressed compression deformation is made annealing treatment, 200-300 DEG C of annealing temperature, obtains formability
The thin plate that can improve, that is, eliminate strain hardening effect, obtains basal plane texture attenuation, the light sheet products that Plastic Forming performance improves.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110129694A (en) * | 2019-05-30 | 2019-08-16 | 西南大学 | A method of improving magnesium alloy plate intensity and forming property |
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| CN106637010A (en) * | 2017-01-12 | 2017-05-10 | 西南大学 | Method for changing orientation of precipitated phase in magnesium alloy |
| CN108265248B (en) * | 2018-01-18 | 2019-12-13 | 重庆大学 | Method and device for improving sheet forming performance through bidirectional compression |
| 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 |
| CN109182859B (en) * | 2018-08-20 | 2020-11-17 | 重庆科技学院 | Method for preparing high-formability magnesium alloy plate through composite deformation |
| CN109261741A (en) * | 2018-10-11 | 2019-01-25 | 重庆科技学院 | A method of regulation Texture |
| 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 |
| CN115055803A (en) * | 2022-05-27 | 2022-09-16 | 广东省科学院中乌焊接研究所 | Method for improving mechanical property and structure thermal stability of magnesium alloy friction stir welding joint |
| CN115927984A (en) * | 2022-11-28 | 2023-04-07 | 云南大学 | Method for improving room-temperature bending forming performance of magnesium alloy |
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| CN104131143B (en) * | 2013-09-11 | 2016-11-09 | 沈阳航空航天大学 | A kind of method preparing magnesium alloy ultrathin band |
| CN103911571B (en) * | 2014-04-03 | 2017-01-18 | 重庆市科学技术研究院 | Method for improving plasticity of magnesium alloy sheets |
| CN104480330B (en) * | 2014-12-11 | 2017-04-26 | 江阴宝易德医疗科技有限公司 | Ultrafine twin-crystal deformed magnesium alloy profile as well as preparation method and application of ultrafine twin-crystal deformed magnesium alloy profile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110129694A (en) * | 2019-05-30 | 2019-08-16 | 西南大学 | A method of improving magnesium alloy plate intensity and forming property |
| CN110129694B (en) * | 2019-05-30 | 2020-08-14 | 西南大学 | Method for improving strength and forming performance of magnesium alloy plate |
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