CN102304684A - Method for improving plastic deformation capacity of magnesium alloy plate - Google Patents
Method for improving plastic deformation capacity of magnesium alloy plate Download PDFInfo
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- CN102304684A CN102304684A CN 201110265665 CN201110265665A CN102304684A CN 102304684 A CN102304684 A CN 102304684A CN 201110265665 CN201110265665 CN 201110265665 CN 201110265665 A CN201110265665 A CN 201110265665A CN 102304684 A CN102304684 A CN 102304684A
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Abstract
The invention relates to a method for improving plastic deformation capacity of a magnesium alloy plate. The method comprises the following steps: carrying out high-temperature pre-annealing on the magnesium alloy plate before rolling deformation, and then carrying out high-temperature final annealing after rolling deformation, so that the basic plane structure of the magnesium alloy plate deflects and the strength of the basic plane structure is greatly reduced, thereby greatly improving the plastic deformation capacity of the magnesium alloy plate. The method is simple in process and low in cost, can be used for large-scale production, and is an economic and effective method for preparing the magnesium alloy plate; and by utilizing the method, applications of magnesium alloy in the various fields of automobile, aviation and aerospace, communication, architecture and the like can be further popularized.
Description
Technical field
The invention belongs to the non-ferrous metal manufacture field, what be specifically related to is a kind of through improving the method that texture improves the magnesium alloy plate plastic deformation ability.
Background technology
Magnesium alloy is the close-packed hexagonal structure metal, and symmetry is poor, and plastic forming ability is poor, and deformation at room temperature mainly is through basal plane a slippage, i.e. { 0002} < 11-20>slip system and the conical surface is twin realizes.The magnesium alloy plate of pair rolling prepared has strong basal plane texture, and promptly the c axle of most of crystal grain is parallel to plate face normal direction, and such grain orientation is unfavorable for follow-up further processing, has limited the room temperature crystallized ability of magnesium alloy plate.Simultaneously, the formation of texture can produce tangible anisotropy.Control texture becomes an important channel of improving the magnesium alloy plate plastic deformation ability, and the method for improving magnesium alloy plate basal plane texture at present has asymmetrical rolling, tandem rolling, unidirectional multi-pass bending etc.These complete processings are high to equipment requirements, are unfavorable for the processing of big plate, and simultaneously, the basal plane texture deflection angle of acquisition is limited, and the reduction of basal plane intensity is not obvious.
Summary of the invention
The basal plane texture that exists in the magnesium alloy plate is strong in order to solve, plastic deformation ability difference and anisotropic problem; The present invention introduces high temperature annealing eventually after being employed in rolling deformation preceding introducing high temperature preannealing and rolling deformation; Control the texture of magnesium alloy plate, thereby improve the ability of the further viscous deformation of magnesium alloy plate significantly.
Technical scheme of the present invention is: improve the method for magnesium alloy plate plastic deformation ability, following steps are arranged:
1, rolling good magnesium alloy plate is carried out preannealing in higher temperature; Annealing temperature is 400 ℃-550 ℃; Annealing time is 10 min-12 h; Make its perfect recrystallization and certain grain growth takes place; Even growing up unusually of some crystal grain of secondary recrystallization generation taken place, thereby obtain the stronger warp of basal plane texture annealed magnesium alloy plate for the first time.
2, the warp that step (1) is obtained annealed magnesium alloy plate for the first time is rolled distortion, and rolling temperature is 10-400 ℃, and roll speed is 5 m/min-60 m/min, and deflection is 5%-25%, obtains the magnesium alloy plate of rolling attitude.
3, the magnesium alloy plate 2 of the rolling attitude that step (2) is obtained carries out whole annealing in higher temperature; Annealing temperature is 400 ℃-550 ℃; Annealing time is 10 min-12 h; Make its perfect recrystallization; This moment, certain deflection can take place in the basal plane texture of magnesium alloy plate; The basal plane texture intensity weakens greatly, thereby obtains plastic deformation ability preferably through the annealed magnesium alloy plate second time.
Annealing temperature described in step (1), (3) is 500 ℃.
Annealing time described in step (1), (3) is 10 min-3h.
According to arts demand, repeatedly repeat the operation of above-mentioned steps (1)-(3), the basal plane texture of the magnesium alloy that can further weaken obtains the better magnesium alloy plate of plasticity.The every repetition once can make texture further improve, and plastic deformation ability is from being further enhanced.
The present invention is through high temperature preannealing before the rolling deformation and the annealing eventually of the high temperature behind the rolling deformation; The size and the distribution of orientations of crystal grain in the adjustment magnesium alloy plate; So that the basal plane texture of magnesium alloy plate deflects; The basal plane texture intensity weakens greatly, thereby improves the plastic deformation ability of magnesium alloy plate significantly.
The present invention is very suitable for scale operation, the magnesium alloy plate that utilizes the present invention to prepare, and the combination with better grain-size and orientation has intensity and plasticity preferably simultaneously, and production efficiency is high, simple to operate, can make production cost reduce by 20% ~ 30%.The major cause that produces this effect is: the present invention adopts the high temperature preannealing of rolling deformation front and back and the processing mode of this easy realization of the whole annealing of high temperature; Utilize the characteristics of magnesium alloy deformation self; Through static recrystallize and secondary recrystallization; Adjust the size and the orientation of crystal grain, reach the purpose that adjustment texture improves plastic deformation ability.
Because there is stronger basal plane texture in magnesium alloy plate; Have than random grains and be orientated more low-angle boundary; The crystal grain that has other non-basal plane texture orientations in the sheet material will be surrounded by high-angle boundary; Have higher energy and transport property; Order about down at pyritous, preferentially grow up, thereby increased the content of the crystal grain of other non-basal plane texture orientations; Weakened the content of the crystal grain of basal plane texture orientation, made the deflection of the basal plane texture generation certain angle among the utmost point figure and the reduction of intensity.
Conventional magnesium alloy annealing region is chosen at 200 ~ 400 ℃ usually; The annealing temperature that surpasses 400 ℃ makes magnesium alloy plate generation secondary recrystallization easily; Crystal grain is grown up unusually; And the performance that is unfavorable for sheet material (mainly is meant mechanical property; Like intensity, plasticity etc.); And the present invention uses the high temperature anneal temperature near the magnesium alloy fusing point; Utilize secondary recrystallization to make grain growth; High temperature annealing eventually through rolling deformation and follow-up short period of time has improved sheet material texture (like basal plane texture, cylinder texture, conical surface texture etc.).
Description of drawings
To combine accompanying drawing that specific examples of the present invention is carried out detailed description below, wherein:
Fig. 1 is the process flow sheet of preparation magnesium alloy plate;
Fig. 2 is the initial state macroscopic view texture through the casting plate of XRD technical measurement;
Fig. 3 is casting plate through the XRD technical measurement macroscopical texture after through 500 ℃ of preannealing 1 h;
Fig. 4 is the macroscopical texture of casting plate process one-pass roller distortion 15% back behind 500 ℃ of whole annealing 20 min through the XRD technical measurement;
Fig. 5 is hot-rolled sheet through the XRD technical measurement macroscopical texture after through 500 ℃ of preannealing 1 h;
Fig. 6 is the macroscopical texture of hot-rolled sheet process one-pass roller distortion 15% back behind 500 ℃ of whole annealing 20min through the XRD technical measurement.
Embodiment
Referring to Fig. 1:
Embodiment 1
Thickness is the AZ31 roll-casting of magnesium alloy plate of 0.84mm, and it is organized as the recrystallize equi-axed crystal, and metaloscope shows that grain-size is 10 μ m, and its macroscopical texture utmost point figure sees accompanying drawing 2, is basal plane texture, and maximum intensity is 8.379; It is carried out the high temperature preannealing; Annealing temperature is 500 ℃; Annealing time is 1 h; Obtain the magnesium alloy plate that grain-size is 20 μ m; It is organized as the recrystallize equi-axed crystal, and the secondary recrystallization that crystal grain is grown up does not unusually take place, and its macroscopical texture utmost point figure sees accompanying drawing 3; Still be basal plane texture, maximum intensity is 10.625; The c axle that shows the magnesium alloy plate crystal grain behind the high temperature preannealing concentrates on more and is parallel on the plate face normal direction.Then this magnesium alloy plate is preheated to 300 ℃ and is rolled, roll speed is 30 m/min, and deflection is about 15%; Should carry out high temperature annealing eventually by rolling attitude magnesium alloy plate; Annealing temperature is 500 ℃; Annealing time is 20 min; Obtain the magnesium alloy plate that grain-size is 20 μ m, it is organized as the recrystallize equi-axed crystal, and the secondary recrystallization that crystal grain is grown up does not unusually take place; Its macroscopical texture utmost point figure sees accompanying drawing 4; (0002) deflection of basal plane texture about 40 °, its maximum intensity is 4.683, shows that diffusion has obviously taken place towards periphery in the distribution of crystal grain c axle; Through after this art breading, deflection has taken place basal plane texture and utmost point density intensity reduces.Improve the anisotropy of magnesium alloy plate, thereby improved the ability of magnesium alloy plate viscous deformation significantly.
Embodiment 2
Thickness is the AZ31 magnesium alloy hot-rolled sheet of 0.84mm, and it is organized as the recrystallize equi-axed crystal, and metaloscope shows that grain-size is 10 μ m; It is carried out the high temperature preannealing; Annealing temperature is 500 ℃; Annealing time is 2 h; Secondary recrystallization has taken place; The grain size range of growing up unusually is 100 ~ 250 μ m; The little crystal grain average grain size that does not take place to grow up unusually is 30 μ m, and its macroscopical texture utmost point figure sees accompanying drawing 5, and basal plane texture maximum intensity is 23.361; Then this magnesium alloy plate is preheated to 300 ℃ and is rolled, roll speed is 10-60 m/min, and deflection is 10%; Should carry out high temperature annealing eventually by rolling attitude magnesium alloy plate; Annealing temperature is 500 ℃; Annealing time is 20 min; Obtain the magnesium alloy plate that grain-size is 36 μ m; The big crystal grain of discrete is arranged, do not have tangible secondary recrystallization, its macroscopical texture utmost point figure sees accompanying drawing 6; Its basal plane texture is scattered towards periphery, and maximum intensity is 4.56; Through after this art breading, basal plane texture density intensity reduces greatly.Repeat aforesaid method, the basal plane texture intensity is weakened, thereby further improve the ability of magnesium alloy plate viscous deformation.
Embodiment 3
With thickness is that the AZ31 roll-casting of magnesium alloy plate of 1.0mm carries out the high temperature preannealing, and annealing temperature is 450 ℃, and annealing time is 3h, and secondary recrystallization has taken place; Then this magnesium alloy plate is preheated to 200 ℃ and is rolled, roll speed is 10m/min, and deflection is about 5%; Should carry out high temperature annealing eventually by rolling attitude magnesium alloy plate, annealing temperature is 450 ℃, and annealing time is 30 min, and through after this art breading, the basal plane texture density intensity of gained magnesium alloy plate reduces greatly.Repeat aforesaid method, the basal plane texture intensity is weakened, thereby further improve the ability of magnesium alloy plate viscous deformation.
Embodiment 4
Thickness is that the AZ31 magnesium alloy hot-rolled sheet of 1.0mm carries out the high temperature preannealing, and annealing temperature is 550 ℃, and annealing time is 50 min; Secondary recrystallization has taken place; Then this magnesium alloy plate is preheated to 400 ℃ and is rolled, roll speed is 60 m/min, and deflection is about 25%; Should carry out high temperature annealing eventually by rolling attitude magnesium alloy plate, annealing temperature is 550 ℃, and annealing time is 10 min, obtains the magnesium alloy plate that grain-size is 25 μ m, and through after this art breading, basal plane texture density intensity reduces greatly.Repeat aforesaid method, the basal plane texture intensity is weakened, thereby further improve the ability of magnesium alloy plate viscous deformation.
Claims (3)
1. method of improving the magnesium alloy plate viscous deformation is characterized in that having the following steps:
(1) rolling good magnesium alloy plate is carried out preannealing 450 ℃-550 ℃ temperature, annealing time is 10 min-12 h, obtains the stronger warp of basal plane texture annealed magnesium alloy plate for the first time;
(2) step (1) is obtained through the temperature rolling deformation of annealed magnesium alloy plate for the first time at 10-400 ℃, roll speed is 5 m/min-60 m/min, deflection is 5%-25%, obtains the magnesium alloy plate of rolling attitude;
(3) magnesium alloy plate of the rolling attitude that step (2) is obtained carries out whole annealing 450 ℃-550 ℃ temperature, and annealing time is 10 min-12 h, obtains plastic deformation ability preferably through the annealed magnesium alloy plate second time.
2. the method for improving the magnesium alloy plate viscous deformation according to claim 1 is characterized in that: the annealing temperature described in step (1), (3) is 500 ℃.
3. the method for improving the magnesium alloy plate viscous deformation according to claim 1 is characterized in that: the annealing time described in step (1), (3) is 10 min-3h.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109433822A (en) * | 2018-10-26 | 2019-03-08 | 同济大学 | A kind of Rolling compund method of magnalium clad plate |
| CN111272789A (en) * | 2020-03-01 | 2020-06-12 | 北京工业大学 | Method for judging plastic deformation capability of rare earth tungsten electrode material |
| CN111647832A (en) * | 2020-06-15 | 2020-09-11 | 宿迁市河海大学研究院 | Method for circularly rolling and annealing pure magnesium plate |
| CN113235027A (en) * | 2021-05-21 | 2021-08-10 | 重庆理工大学 | Deformed magnesium alloy plate with good matching of strength and plasticity and preparation method thereof |
Citations (3)
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| JP2010070821A (en) * | 2008-09-19 | 2010-04-02 | Osaka Prefecture Univ | Magnesium alloy sheet having excellent room temperature formability and method for treating magnesium alloy sheet |
| CN101857933A (en) * | 2009-04-10 | 2010-10-13 | 中国科学院金属研究所 | Hot rolling process of high-plasticity and low-anisotropy magnesium alloy and sheet thereof |
| CN101984128A (en) * | 2010-12-07 | 2011-03-09 | 西南铝业（集团）有限责任公司 | Magnesium alloy sheet cold rolling method |
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2011
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010070821A (en) * | 2008-09-19 | 2010-04-02 | Osaka Prefecture Univ | Magnesium alloy sheet having excellent room temperature formability and method for treating magnesium alloy sheet |
| CN101857933A (en) * | 2009-04-10 | 2010-10-13 | 中国科学院金属研究所 | Hot rolling process of high-plasticity and low-anisotropy magnesium alloy and sheet thereof |
| CN101984128A (en) * | 2010-12-07 | 2011-03-09 | 西南铝业（集团）有限责任公司 | Magnesium alloy sheet cold rolling method |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109433822A (en) * | 2018-10-26 | 2019-03-08 | 同济大学 | A kind of Rolling compund method of magnalium clad plate |
| CN109433822B (en) * | 2018-10-26 | 2020-05-08 | 同济大学 | Rolling compounding method of aluminum-magnesium interlayer composite plate |
| CN111272789A (en) * | 2020-03-01 | 2020-06-12 | 北京工业大学 | Method for judging plastic deformation capability of rare earth tungsten electrode material |
| CN111647832A (en) * | 2020-06-15 | 2020-09-11 | 宿迁市河海大学研究院 | Method for circularly rolling and annealing pure magnesium plate |
| CN113235027A (en) * | 2021-05-21 | 2021-08-10 | 重庆理工大学 | Deformed magnesium alloy plate with good matching of strength and plasticity and preparation method thereof |
| CN113235027B (en) * | 2021-05-21 | 2021-12-10 | 重庆理工大学 | Deformed magnesium alloy plate with good matching of strength and plasticity and preparation method thereof |
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Application publication date: 20120104 |