CN104498848B - Processing method of magnesium alloy bar material - Google Patents
Processing method of magnesium alloy bar material Download PDFInfo
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- CN104498848B CN104498848B CN201510029162.2A CN201510029162A CN104498848B CN 104498848 B CN104498848 B CN 104498848B CN 201510029162 A CN201510029162 A CN 201510029162A CN 104498848 B CN104498848 B CN 104498848B
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- magnesium alloy
- alloy rod
- bar material
- processing method
- alloy bar
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Abstract
The invention provides a processing method of a magnesium alloy bar material. The processing method of the magnesium alloy bar material includes steps: 1) processing a blank piece of the magnesium alloy bar material; 2) performing preset surface layer shear strain variable torsion on the blank piece of the magnesium alloy bar material at preset torsion temperature and preset torsion speed, and enabling the blank piece of the magnesium alloy bar material to plastically deform so as to obtain the magnesium alloy bar material. The processing method of the magnesium alloy bar material performs torsion deformation on the blank piece of the magnesium alloy bar material, changes original texture, grain size and dislocation structure of the blank piece of the magnesium alloy bar material by regulating and controlling a torsion mode, presetting the torsion temperature, presetting a surface layer shear strain variable and presetting the torsion speed, and thereby effectively improves stretching stress or compression strength of the magnesium alloy bar material, reduces plastic anisotropy, and then improves mechanical properties of the magnesium alloy bar material.
Description
Technical field
The present invention relates to technical field of nonferrous metal processing, more particularly, it relates to a kind of processing side of magnesium alloy rod
Method.
Background technology
Metal bar is a kind of widely used section bar.The current main system by way of casting and extruding of magnesium alloy rod
It is standby.Cast magnesium alloy coarse grains and mechanical property is poor.Comparatively speaking, the crystal grain of extruded Magnesium Alloy bar is tiny and has
Higher intensity and plasticity.However, extrusion process can make magnesium alloy produce stronger deformation texture, so as to cause magnesium alloy extrusion
Bar has larger plastic anisotropy, have impact on the mechanical property of magnesium alloy rod.
In sum, the mechanical property of magnesium alloy rod how is improved, is that current those skilled in the art are urgently to be resolved hurrily
Technical problem.
The content of the invention
In view of this, it is an object of the invention to provide a kind of processing method of magnesium alloy rod, to improve magnesium alloy bar
The mechanical property of material.
In order to achieve the above object, the present invention provides following technical scheme：
A kind of processing method of magnesium alloy rod, including step：
1) processing magnesium alloy Bar material blank part；
2) default top layer is carried out to the magnesium alloy rod blank under temperature and default reverse speed in default torsion
The torsion of shear strain amount so as to produce torsional duetility deformation, obtain magnesium alloy rod.
Preferably, in the processing method of above-mentioned magnesium alloy rod, the step 2) also include step 3 afterwards)：
The magnesium alloy rod is made annealing treatment.
Preferably, in the processing method of above-mentioned magnesium alloy rod, the step 3) it is specially：The magnesium alloy rod is added
Heat is incubated 0.5h-3h to 200 DEG C -500 DEG C of temperature.
Preferably, in the processing method of above-mentioned magnesium alloy rod, the step 2) described in preset reverse speed be 1rpm-
10rpm；The default torsion temperature is 25 DEG C -400 DEG C.
Preferably, in the processing method of above-mentioned magnesium alloy rod, the step 1) process the magnesium especially by casting
Alloy bar material blank, and the step 2) described in preset reverse temperature be 200 DEG C -400 DEG C, the default top layer shear strain
Measure as 0.01-2.00.
Preferably, in the processing method of above-mentioned magnesium alloy rod, the step 1) in for casting the magnesium alloy bar
Add solid solution element in the raw material of material blank.
Preferably, in the processing method of above-mentioned magnesium alloy rod, the solid solution element is rare earth metal.
Preferably, in the processing method of above-mentioned magnesium alloy rod, the step 1) it is specially：
Magnesium alloy blank is cast out first, it is then molding by extrusion that the magnesium alloy blank is squeezed into into bar shape
Shape；
And the step 2) described in preset that to reverse temperature be 25 DEG C -200 DEG C, the default top layer shear strain amount is
0.01-0.50。
It can be seen from above-mentioned technical scheme that, the processing method of the magnesium alloy rod that the present invention is provided processes first magnesium conjunction
Golden Bar material blank part；Then preset table is carried out to magnesium alloy rod blank at default torsion temperature and default reverse speed
The torsion of layer shear strain amount so as to produce torsional duetility deformation, obtain magnesium alloy rod.
The present invention, by regulating and controlling torsional mode, presets and reverses temperature to carrying out torsional deflection using magnesium alloy rod blank
Degree, default top layer shear strain amount and reverse speed, under the effect of shearing stress in torsion power, make initially knitting for magnesium alloy rod blank
Structure, crystallite dimension and dislocation structure change, and so as to be effectively improved the stretching/compressing intensity of magnesium alloy rod, reduce plasticity
Anisotropy, and then improve the mechanical property of magnesium alloy rod.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is the schematic flow sheet of the processing method of the magnesium alloy rod that an embodiment of the present invention is provided；
Fig. 2 is the schematic flow sheet of the processing method of the magnesium alloy rod that another kind embodiment of the invention is provided；
Fig. 3 is microstructure and texture development schematic diagram during the magnesium alloy rod torsional deflection that the present invention is provided；
Fig. 4 is that the tensile stress strain curve that magnesium alloy rod provided in an embodiment of the present invention is reversed after differently strained amount shows
It is intended to；
Fig. 5 is that the compression stress strain curve that magnesium alloy rod provided in an embodiment of the present invention is reversed after differently strained amount is shown
It is intended to.
Specific embodiment
A kind of processing method of magnesium alloy rod is embodiments provided, the mechanical property of magnesium alloy rod is improve
Energy.
To make purpose, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention, rather than the embodiment of whole.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Accompanying drawing 1-5 is refer to, the processing method of magnesium alloy rod provided in an embodiment of the present invention includes step：
S1, processing magnesium alloy Bar material blank part；
Specifically, the present invention can be prepared by directly casting, extrusion molding or other processing modes such as mechanical means
Magnesium alloy rod blank.
S2, above-mentioned magnesium alloy rod is placed on torsion equipment, default profit under temperature and default reverse speed is reversed
The torsion of default top layer shear strain amount is carried out to magnesium alloy rod blank with torsion equipment so as to produce torsional duetility deformation,
Obtain magnesium alloy rod.
The present invention, by regulating and controlling torsional mode, presets and reverses temperature to carrying out torsional deflection using magnesium alloy rod blank
Degree, default top layer shear strain amount and reverse speed, under the effect of shearing stress in torsion power, make initially knitting for magnesium alloy rod blank
Structure, crystallite dimension and dislocation structure change, and so as to be effectively improved the stretching/compressing intensity of magnesium alloy rod, reduce plasticity
Anisotropy, and then improve the mechanical property of magnesium alloy rod.
Additionally, the processing method of above-mentioned processing magnesium alloy bar also has efficiency high, equipment simple and low cost excellent
Point.
Further to improve plasticity during magnesium alloy rod Compression and Expansion, the magnesium alloy rod that above-described embodiment is provided plus
In work method, step S3 is also included after step S2：Magnesium alloy rod is made annealing treatment.That is, the present invention is to magnesium
Alloy bar material blank is carried out after torsional duetility deformation, and also magnesium alloy rod is made annealing treatment, and can remove residual stress
With elimination tissue defects, improve the material ductility and toughness of magnesium alloy rod.It will be appreciated by persons skilled in the art that on
Stating processing method can not also be made annealing treatment.
Preferably, step S3 is specially：Magnesium alloy rod is heated to into 200 DEG C -500 DEG C of temperature, and is incubated 0.5h-3h.
That is, the annealing conditions of magnesium alloy rod are：0.5h-3h is incubated at 200 DEG C less than -500 DEG C, magnesium alloy rod can be made
There is preferable plasticity during Compression and Expansion.Certainly, according to different demands, above-mentioned heating-up temperature and temperature retention time can also be
Other values, the present invention is not specifically limited to this.
In order to ensure magnesium alloy rod occurs plastic deformation and is unlikely to disrumpent feelings, the default torsion of above-mentioned steps S2 that twists
Rotary speed is 1rpm-10rpm (abbreviation of revolutions per minute, turn per point)；It is default reverse temperature be 25 DEG C-
400℃.The present embodiment is set as spinning rate at a slow speed, and stress concentration can be made fully to be released, and prevents because of reverse speed
It is too fast, magnesium alloy rod edge occur stress concentration crack twist it is disrumpent feelings, so as to improve the conjunction of magnesium alloy rod
Lattice rate.According to various sizes of magnesium alloy rod, above-mentioned default reverse speed can also be other values, and such as 11rpm, the present invention is right
This is not specifically limited.
As shown in figure 1, in a kind of specific embodiment of the invention, step S1 processes magnesium alloy rod especially by casting
It is 200 DEG C -400 DEG C to preset in blank, and step S2 and reverse temperature, and it is 0.01-2.00 to preset top layer shear strain amount γ.It is above-mentioned
In the range of top layer shear strain amount γ be able to ensure that magnesium alloy rod occur plastic deformation, while guaranteeing magnesium during torsional deflection
Alloy bar material does not occur disrumpent feelings.
Specifically, when magnesium alloy rod (trade mark is AZ31) of a diameter of 6mm of parallel-segment is processed, by casting state magnesium alloy
Bar is placed on torsion testing machine, and with reverse speed as 4rpm at 300 DEG C, reversing generation sample top layer shear strain amount γ is
The torsional duetility deformation of 0.03-1.5.As a result show, with the increase of torsional deflection amount, the quantity of tiny recrystal grain increases
Plus.It can be seen that, the crystallite dimension of casting state magnesium alloy rod can effectively be refined by Heat torsion technique, so as to improve magnesium alloy bar
The mechanical property of material.
Preferably, in the processing method of the magnesium alloy rod that above-described embodiment is provided, closing for casting magnesium in step S1
Add solid solution element in the raw material of golden Bar material blank part.
The present embodiment passes through the new commercial solution strengthening of addition solid solution element exploitation and precipitation strength magnesium alloy, further
Improve the obdurability and anisotropy of magnesium alloy rod.Interchangeable, the present invention can not also add solid in cast raw material
Molten raw material, the torsional duetility deformation for only relying on step S2 reaches mechanical property requirements.
Above-mentioned solid solution element is rare earth metal.It is, during cast magnesium alloy Bar material blank, it is former in magnesium alloy
The Re (abbreviation of Rare earth, rare earth element) added in material, can produce larger solid solution and precipitating reinforcing effect, improve
The obdurability and anisotropy of magnesium alloy rod.Interchangeable, above-mentioned solid solution element can also be zirconium, cast out ZK60 (Mg-
6Zn-0.6Zr) --- magnesium zinc zircaloy, compact grained tissue can be obtained；Can also be aluminum, cast out AZ91 --- magnalium is closed
Gold, to reach the same obdurability for improving magnesium alloy rod and anisotropic effect, the present embodiment is no longer repeated one by one.
As shown in Fig. 2 in present invention another kind specific embodiment, step S1' is specially：Magnesium alloy hair is cast out first
Blank, it is then molding by extrusion that magnesium alloy blank is squeezed into into bar shape；And it is 25 that torsion temperature is preset in step S2'
DEG C -200 DEG C, it is 0.01-0.50 to preset top layer shear strain amount γ.In the torsion reality of the default torsion temperature range of the present embodiment
Test, torsion can select directly annealing after terminating, improve the elongation percentage of magnesium alloy rod.
The present invention can carry out Equal Channel Angular Pressing and/or Asymmetric Extrusion, the above-mentioned magnesium of extrusion molding to magnesium alloy blank
Alloy bar material blank.In order to further improve the mechanical property of magnesium alloy rod, the present invention is casting out magnesium alloy blank
Afterwards, make magnesium alloy blank carry out Plastic Forming by Equal Channel Angular Pressing, be squeezed into bar shape, carry so as to produce fine grained texture
The intensity and plasticity of high magnesium alloy rod.The present invention can also carry out Asymmetric Extrusion to magnesium alloy blank, produce Ultra-fine Grained
And the extruding texture of reduction or change magnesium alloy rod, further improve magnesium alloy rod obdurability and anisotropy.
Specifically, when magnesium alloy rod (trade mark is AZ31) of a diameter of 6mm of parallel-segment is processed, step S2' is specifically grasped
As：Extruded Magnesium Alloy bar is placed on torsion testing machine, at room temperature with reverse speed as 2rpm, is reversed and is produced sample
Shear strain amount γ in top layer deforms for the torsional duetility of 0.03-0.18.After torsional duetility deformation, by step S3' to magnesium alloy bar
Material is made annealing treatment, and annealing conditions are：0.5h-3h is incubated at 200 DEG C less than -500 DEG C, the material for improving magnesium alloy rod prolongs
Malleability and toughness.
As can be seen that extrusion magnesium alloy bar is after torsional duetility deformation from the microstructure schematic diagram of accompanying drawing 3, magnesium is closed
There is significant change in golden bar microstructure, edging tissue is substantially disorderly than core structure.This is because under shearing stress effect
There is sliding and rotation in magnesium alloy crystal grain, because edge shearing stress is much larger than center portion, cause that edge dislocation density is higher, dislocation knot
Structure is more numerous and diverse, and microstructure is more disorderly.Additionally, a small amount of twin occurs in the intra-die near sample top layer, and center portion is then
Without twin.It can be seen that, the initial microstructure of torsional deflection controllable magnesium alloy rod.Such as Fig. 3, shown in the corresponding pole figure in γ=0,
The initial bar of magnesium alloy has very strong extruding texture.γ=0.03 in contrast Fig. 3, γ=0.08, corresponding to γ=0.18
Figure is as can be seen that increasing with shearing stress in torsion variable, magnesium alloy crystal orientation is distributed to be become to disperse, and initial compression texture is weak
Change.It can be seen that, the original texture of torsional deflection controllable magnesium alloy rod.
Meanwhile, the present embodiment also to reverse different shear strain amounts (γ=0, γ=0.03, γ=0.08, γ's=0.18)
Sample is stretched and compression verification, and test result is shown in accompanying drawing 4 and Fig. 5.Attached Figure 4 and 5 show that extrusion magnesium alloy bar is through turning round
After turning plastic deformation, stretching and the yield strength compressed increase, and Compression and Expansion surrender unsymmetry decreases.Can
See, turn that the stretching/compressing intensity of magnesium alloy rod can be improved by cold twisting, while its anisotropy is reduced, so as to improve
The mechanical property of magnesium alloy rod.
Each embodiment is described by the way of progressive in this specification, and what each embodiment was stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope for causing.
Claims (6)
1. a kind of processing method of magnesium alloy rod, it is characterised in that including step：
1) processing magnesium alloy Bar material blank part；
2) it is default reverse the magnesium alloy rod blank is carried out under temperature and default reverse speed that default top layer cuts should
The torsion of variable so as to produce torsional duetility deformation, obtains magnesium alloy rod, and the default reverse speed is 1rpm-10rpm,
The default torsion temperature is 25 DEG C -400 DEG C, and the default top layer shear strain amount is 0.01-2.00；
3) magnesium alloy rod is made annealing treatment.
2. the processing method of magnesium alloy rod as claimed in claim 1, it is characterised in that the step 3) it is specially：By institute
State magnesium alloy rod and be heated to 200 DEG C -500 DEG C of temperature, and be incubated 0.5h-3h.
3. the processing method of magnesium alloy rod as claimed in claim 1, it is characterised in that the step 1) especially by casting
Process the magnesium alloy rod blank, and the step 2) described in preset reverse temperature be 200 DEG C -400 DEG C.
4. the processing method of magnesium alloy rod as claimed in claim 3, it is characterised in that the step 1) in for casting
Add solid solution element in the raw material of the magnesium alloy rod blank.
5. the processing method of magnesium alloy rod as claimed in claim 4, it is characterised in that the solid solution element is rare earth gold
Category.
6. the processing method of magnesium alloy rod as claimed in claim 1, it is characterised in that the step 1) it is specially：
Magnesium alloy blank is cast out first, it is then molding by extrusion that the magnesium alloy blank is squeezed into into bar shape；
And the step 2) described in preset reverse temperature be 25 DEG C -200 DEG C, the default top layer shear strain amount be 0.01-
0.50。
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| CN201510029162.2A CN104498848B (en) | 2015-01-21 | 2015-01-21 | Processing method of magnesium alloy bar material |
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| CN109609899B (en) * | 2019-01-09 | 2021-03-02 | 西南大学 | Surface modification method of magnesium alloy |
| CN110665984B (en) * | 2019-10-12 | 2021-03-12 | 中北大学 | Extrusion forming method of magnesium alloy bar without anisotropy |
| CN111229856B (en) * | 2019-12-31 | 2022-03-08 | 南京理工大学 | Continuous twisting and drawing device and method for preparing isomeric magnesium alloy bar |
| CN111519147B (en) * | 2020-03-18 | 2022-03-11 | 赣州有色冶金研究所有限公司 | Tantalum target material with preferred orientation and preparation method thereof |
| CN111763896B (en) * | 2020-06-15 | 2021-09-03 | 北京航空航天大学 | Method for regulating and controlling mechanical property of magnesium alloy by utilizing crystal boundary stability |
| CN112030086B (en) * | 2020-08-26 | 2021-08-31 | 中南大学 | Method for improving fatigue resistance of cast magnesium alloy |
| CN112742888A (en) * | 2020-12-17 | 2021-05-04 | 西南大学 | Composite bar and preparation method thereof |
| CN114369772B (en) * | 2021-12-08 | 2022-09-16 | 西南交通大学 | Preparation method of gradient metal material with high elongation |
| CN114182084A (en) * | 2021-12-10 | 2022-03-15 | 西安交通大学 | Method for eliminating anisotropy of pressure processing metal pipe |
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| JP2010121165A (en) * | 2008-11-19 | 2010-06-03 | Mitsubishi Alum Co Ltd | Magnesium alloy sheet and method for producing the same |
| CN101492797B (en) * | 2009-01-16 | 2010-08-11 | 重庆大学 | Method for improving shaping property of magnesium alloy strip |
| KR101139879B1 (en) * | 2009-07-17 | 2012-05-02 | 포항공과대학교 산학협력단 | Method for manufacturing wrought magnesium alloy having improved low-cycle fatigue life using pre-straining |
| CN103014571B (en) * | 2012-12-27 | 2015-03-04 | 重庆大学 | Method for increasing plastic deformation capability of magnesium alloy plate strip |
| CN103215531A (en) * | 2013-04-25 | 2013-07-24 | 东南大学 | Preparation method of nanocrystalline magnesium alloy by continuous and severe plastic deformation |
| CN103540881B (en) * | 2013-11-08 | 2015-07-01 | 中南大学 | Processing method for improving drawing and pressing asymmetry of magnesium alloy |
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