CN103233191B - A kind of thermal treatment process improving wrought magnesium alloys intensity - Google Patents
A kind of thermal treatment process improving wrought magnesium alloys intensity Download PDFInfo
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- CN103233191B CN103233191B CN201310164236.4A CN201310164236A CN103233191B CN 103233191 B CN103233191 B CN 103233191B CN 201310164236 A CN201310164236 A CN 201310164236A CN 103233191 B CN103233191 B CN 103233191B
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Abstract
The invention provides a kind of thermal treatment process improving wrought magnesium alloys intensity, this technique by small deformation amount cold rolling after, then through the artificial aging of different time, to reach the object significantly improving magnesium alloy strength.Specifically comprise the following steps: 1) cold rolling at room temperature magnesium alloy, its cold rolling reduction is 5-7.5%; 2) again the magnesium alloy after cold rolling predeformation is heated to 150-200 DEG C of timeliness, soaking time is 15-100h, and last air cooling is to room temperature.This invention can significantly improve the intensity of magnesium alloy, and relative to conventional aging technique, the present invention can also significantly improve magnesium alloy timeliness speed.Processing unit used is conventional general-purpose equipment in addition, easily operates, and cost is lower, and industrial being easy to realizes.
Description
Technical field
The present invention relates to the thermal treatment process of magnesium alloy materials, particularly a kind of thermal treatment process improving wrought magnesium alloys intensity.
Background technology
In recent years, along with various industry develops rapidly efficiently, more and more higher requirement is proposed to the performance of the structured material applied in production and various component etc., be badly in need of developing various novel material, as Mg-based hydrogen storage, to meet the requirement of varying environment to various materials'use performance.Mg-based hydrogen storage is structural metallic materials the lightest at present, have that density is low, specific tenacity and specific rigidity is high, damping shock absorption is good, thermal conductivity is good, effectiveness is good, machinability is excellent, accessory size is stable, the easy advantage such as recovery, have broad application prospects in aerospace, automobile, defence and military, 3C field etc.But most of magnesium alloy has close-packed hexagonal structure, it is a kind of metallic substance being difficult to viscous deformation, press working forming property difference, and magnesium-alloy material is based on cast member, and casting of magnesium alloy forging piece exists the shortcoming such as coarse grains, poor, the easy generation defect of mechanical property, greatly limit magnesium alloy range of application.But the magnesium alloy materials prepared by plastic working techniques such as extruding, rollings and component have higher intensity, better ductility and more diversified mechanical property.Therefore the research of wrought magnesium alloys has become the important directions in world's Magnesium Industry.
Research finds, wrought magnesium alloys is carried out to the artificial aging of different time, though there is the precipitation of second-phase in ag(e)ing process, but strengthening effect is more weak, within the specific limits, increase the increasing number of second-phase with aging time, but this does not make the mechanical property of wrought magnesium alloys be significantly improved.Therefore, the mechanical property improving wrought magnesium alloys is very important.
Summary of the invention
For prior art above shortcomings, the object of this invention is to provide the thermal treatment process that a kind of basis effectively controlling alloy microstructure can give full play to material high strength potentiality.
For achieving the above object, the technical solution used in the present invention is: a kind of thermal treatment process improving wrought magnesium alloys intensity, is characterized in that: by small deformation amount cold rolling after, then through the artificial aging of different time, realize significantly improving of magnesium alloy strength, concrete technology step is:
1) cold rolling viscous deformation: it is cold rolling magnesium alloy to be carried out on milling train 1 passage, and its cold rolling reduction is 5-7.5%;
2) artificial aging: the magnesium alloy after cold rolling viscous deformation is heated to 150-200 DEG C and carries out artificial aging, soaking time is 15-100h, and last air cooling is to room temperature.
Small deformation amount in technique scheme refers to the cold rolling reduction 5-7.5% in step 1).
Further, described magnesium alloy is AZ system or Z K series magnesium alloy system.
The present invention, by first carrying out the cold rolling predeformation of small deformation amount, introduces twin and dislocation in wrought magnesium alloys.Again through the artificial aging of different time, the alloying element of solid solution is separated out from matrix, form second-phase.General second-phase tends to separate out at crystal boundary, twin, dislocation homenergic higher position, so cold rolling predeformation can promote the precipitation of second-phase, second-phase can play the effect of dispersion-strengthened.And the twin produced in cold rolling predeformation process, the motion of dislocation can be hindered.On the other hand, carry out the cold rolling enhancing that result in basal plane texture to magnesium alloy, when stretching along the direction of extrusion, the angle of the normal direction of basal plane and external force axis can be made close to 90 °, and the Schmid factor is tending towards 0, at this moment needs larger external force just can make it that slippage occurs.So the enhancing of the twin of cold rolling generation and basal plane texture significantly improves the intensity of magnesium alloy.
Compared to existing technology, the present invention has following beneficial effect:
1, strengthening effect of the present invention is remarkable: the present invention utilizes predeformation to make the twin produced in magnesium alloy, hinder the motion of dislocation, facilitate the precipitation of second-phase in ag(e)ing process, moreover the enhancing of cold rolling rear basal plane texture significantly improves the intensity of high-strength wrought magnesium alloys simultaneously.The wrought magnesium alloys yield strength of passing through this thermal treatment process is the highest can improve 114MPa.
2, the present invention is simple to operate, cost is lower: the present invention utilizes conventional general-purpose equipment to realize, technological design is reasonable, flow process is short, wherein predeformation only needs 1 passage small deformation, the wrought magnesium alloys of more high strength can be obtained after artificial aging, improve production efficiency, reduce costs, be conducive to heavy industrialization application.
3, the present invention is widely applicable: the present invention is applicable to the commercial wrought magnesium alloys system of the multiple trade mark, as AZ system, ZK system, ZM series magnesium alloy etc.
Accompanying drawing explanation
Fig. 1 is AZ61 magnesium alloy extrusion plate and the stress strain curve after present invention process thermal treatment;
Fig. 2 is ZK60 magnesium alloy extrusion plate and the stress strain curve after present invention process thermal treatment;
Fig. 3 (a) is the scanning macrograph of AZ61 magnesium alloy extrusion sheet material;
Fig. 3 (b) is for after AZ61 magnesium alloy extrusion, cold rolling through 7.5%, then through 200 DEG C of timeliness 20 hours, the scanning macrograph after air cooling;
Fig. 3 (c) is for after AZ61 magnesium alloy extrusion, cold rolling through 7.5%, then through 200 DEG C of timeliness 60 hours, the scanning macrograph after air cooling;
Fig. 3 (d) is for after AZ61 magnesium alloy extrusion, cold rolling through 7.5%, then through 200 DEG C of timeliness 100 hours, the scanning macrograph after air cooling.
Embodiment
The present invention is described in further detail with embodiment with reference to the accompanying drawings.
It should be noted that these embodiments are for illustration of the present invention, instead of limitation of the present invention, to the simple modifications of thermal treatment process of the present invention under concept thereof of the present invention, all belong to the scope of protection of present invention.
embodiment 1
Improve a thermal treatment process for wrought magnesium alloys intensity, this thermal treatment process comprises the following steps:
1) raw material magnesium alloy is adopted: use common AZ61 wrought magnesium alloys ingot casting to be raw material, alloying constituent (weight percentage) is: 6.64%Al, 1.01%Zn, 0.25%Mn, and impurity element is less than 0.01%, and all the other are Mg.
2) Homogenization Treatments of magnesium alloy ingot: the Homogenization Treatments carrying out magnesium alloy ingot in heat treatment furnace, temperature 400 DEG C, time 12h.
3) plastic extruding deformation: extruded on extrusion machine by the magnesium alloy ingot after Homogenization Treatments, extrusion temperature 390 DEG C, extrusion ratio is 11.7.
Fig. 3 (a) is the scanning macrograph of AZ61 magnesium alloy extrusion sheet material, and as can be seen from the figure in AZ61 magnesium alloy extrusion sheet material, second-phase is little, and matrix is entered in solid solution substantially.AZ61 extrusion plate yield strength is at room temperature 170MPa, and tensile strength is 326MPa, and unit elongation is 20.8%.
4) cold rolling viscous deformation: AZ61 magnesium alloy extrusion sheet material is carried out the cold rolling predeformation that 1 pass deformation is 7.5% on milling train.
5) artificial aging: people's work efficiency thermal treatment when being carried out by the AZ61 magnesium alloy after cold rolling, thermal treatment temp is 200 DEG C, and soaking time is 20h, and air cooling is to room temperature.
Fig. 3 (b) is for after AZ61 magnesium alloy extrusion, cold rolling through 7.5%, then through 200 DEG C of timeliness 20h, the scanning macrograph after air cooling.As can be seen from the figure still there is twin at intracrystalline, have the trend of segregation at twin place second-phase.Through the AZ61 magnesium alloy that this technique obtains, yield strength is at room temperature 222MPa, and tensile strength is 350MPa, and unit elongation is 14.3%.
embodiment 2
Raw material magnesium alloy and Homogenization Treatments, plastic extruding deformation, cold rolling viscous deformation, artificial aging thermal treatment temp are identical with embodiment 1, and difference is, AZ61 magnesium alloy timeliness soaking time is 60h.
Fig. 3 (c) is for after AZ61 magnesium alloy extrusion, cold rolling through 7.5%, then through 200 DEG C of timeliness 60h, the scanning macrograph after air cooling.Therefrom can find out, relative Fig. 3 (b) Second Phase Precipitation is more, and it is also more obvious to go out Second Phase Precipitation at crystal boundary and twin, and volume is larger.Through the AZ61 magnesium alloy that this technique obtains, yield strength is at room temperature 231MPa, and tensile strength is 345MPa, and unit elongation is 12.7%.
embodiment 3
Raw material magnesium alloy and Homogenization Treatments, plastic extruding deformation, cold rolling viscous deformation, artificial aging thermal treatment temp are identical with embodiment 1, and difference is, AZ61 magnesium alloy timeliness soaking time is 100h.
Fig. 3 (d) is for after AZ61 magnesium alloy extrusion, cold rolling through 7.5%, then through 200 DEG C of timeliness 100h, the scanning macrograph after air cooling.As can be seen from the figure in grain boundaries and the obvious alligatoring of twin place second-phase.Through the AZ61 magnesium alloy that this technique obtains, yield strength is at room temperature 219MPa, and tensile strength is 343MPa, and unit elongation is 11.6%.
embodiment 4
The raw material magnesium alloy used as different from Example 1 is different, and raw material magnesium alloy adopts ZK60, and its thermal treatment process comprises the following steps:
1) raw material magnesium alloy is adopted: use common ZK60 high-strength wrought magnesium alloys ingot casting to be raw material, alloying constituent (weight percentage) is: 6.37%Zn, 0.53%Zr, and impurity element is less than 0.007%, and all the other are Mg.
2) Homogenization Treatments of magnesium alloy ingot: the Homogenization Treatments carrying out magnesium alloy ingot in heat treatment furnace, temperature 420 DEG C, time 12h.
3) plastic extruding deformation: extruded on extrusion machine by the magnesium alloy ingot after Homogenization Treatments, extrusion temperature 390 DEG C, extrusion ratio is 11.7.
The ZK60 magnesium alloy extrusion sheet material yield strength at room temperature obtained through extruding is 143MPa, and tensile strength is 274MPa, and unit elongation is 32.1%
4) cold rolling viscous deformation: ZK60 magnesium alloy extrusion sheet material carries out the cold rolling predeformation that 1 pass deformation is 5% on milling train.
5) artificial aging: the ZK60 magnesium alloy after cold rolling is carried out aging strengthening model, thermal treatment temp is 150 DEG C, and soaking time is 15h, and air cooling is to room temperature.
Through the ZK60 magnesium alloy that this technique obtains, yield strength is at room temperature 249MPa, and tensile strength is 368MPa, and unit elongation is 6.6%.
embodiment 5
Raw material magnesium alloy and Homogenization Treatments, plastic extruding deformation, cold rolling viscous deformation, artificial aging thermal treatment temp are identical with embodiment 4, and difference is, ZK60 magnesium alloy timeliness soaking time is 50h.
Through the ZK60 magnesium alloy that this technique obtains, yield strength is at room temperature 257MPa, and tensile strength is 355MPa, and unit elongation is 9.8%.
Table 1 above-described embodiment wrought magnesium alloys mechanical performance compare
| Alloy | Thermal treatment process | Yield strength/MPa | Tensile strength/MPa | Unit elongation |
| As-extruded AZ61 | Nothing | 170 | 326 | 20.8% |
| Embodiment 1 (AZ61) | 7.5% cold rolling+200 DEG C × 20h timeliness | 222 | 350 | 14.3% |
| Embodiment 2 (AZ61) | 7.5% cold rolling+200 DEG C × 60h timeliness | 231 | 345 | 12.7% |
| Embodiment 3 (AZ61) | 7.5% cold rolling+200 DEG C × 100h timeliness | 219 | 343 | 11.6% |
| As-extruded ZK60 | Nothing | 143 | 274 | 32.1% |
| Embodiment 4 (ZK60) | 5% cold rolling+150 DEG C × 15h timeliness | 249 | 368 | 6.6% |
| Embodiment 5 (ZK60) | 5% cold rolling+150 DEG C × 50h timeliness | 257 | 355 | 9.8% |
As can be seen from Table 1, embodiment 1-3 of the present invention, through deflection be 7.5% cold rolling predeformation and 20h, 60h, 100h timeliness after the AZ61 magnesium alloy that obtains, room temperature lower yield strength improves 52MPa, 61MPa, 49MPa respectively, and tensile strength improves 24MPa, 19MPa, 17MPa respectively.Described embodiment 4-5, through deflection be 5% cold rolling predeformation and 15h, 50h timeliness after the ZK60 magnesium alloy that obtains, room temperature lower yield strength improves 106MPa respectively, 114MPa, and tensile strength improves 94MPa, 81MPa respectively.This be due to timeliness before cold rolling predeformation create a large amount of dislocations and twin in the magnesium alloy, can promote the precipitation of second-phase, second-phase has the effect of dispersion-strengthened; And the enhancing of cold rolling rear basal plane texture when can make stretching the Schmid factor be tending towards 0 and make intensity increase.This illustrates, thermal treatment process of the present invention, can significantly improve the intensity of wrought magnesium alloys.
embodiment 6
Improve a thermal treatment process for wrought magnesium alloys intensity, this thermal treatment process comprises the following steps:
Adopt common AZ61 magnesium alloy pressing plate material, this AZ61 magnesium alloy pressing plate material component (weight percentage) is 6.64%Al, 1.01%Zn, 0.25%Mn, and impurity element is less than 0.01%, and all the other are Mg; Yield strength is at room temperature 170MPa, and tensile strength is 326MPa, and unit elongation is 20.8%.
1) cold rolling viscous deformation: AZ61 magnesium alloy plate is carried out on milling train the cold rolling predeformation that 1 pass deformation is 7.5%.
2) artificial aging: people's work efficiency thermal treatment when being carried out by the AZ61 magnesium alloy after cold rolling, thermal treatment temp is 200 DEG C, and soaking time is 20h, and air cooling is to room temperature.Through the AZ61 magnesium alloy that this technique obtains, yield strength is at room temperature 222MPa, and tensile strength is 350MPa, and unit elongation is 14.3%.
Known by above-described embodiment, common commercial wrought magnesium alloys, by thermal treatment process of the present invention, can improve the intensity of wrought magnesium alloys significantly.Wrought magnesium alloys after thermal treatment process process of the present invention has wide range of applications, and can meet the fields such as aerospace, automobile, defence and military, 3C to the actual demand of high-quality lightweighting materials.The present invention is simple to operate, and processing unit used is conventional general-purpose equipment, and cost is lower, easy handling.
The present invention only with typical wrought magnesium alloys AZ61 and ZK60 for objective for implementation, but do not get rid of the magnesium alloy of the inventive method to other type there is equivalent effect.The temperature of cold rolling reduction of the present invention, timeliness, soaking time are not limited to the value of embodiment.Cold rolling reduction is according to the difference of wrought magnesium alloys system, any value of optional about 5-15%, aging temp and soaking time are also according to the difference of wrought magnesium alloys system, optional 130 ~ 200 DEG C, any value of about 10 ~ 100h, as aging temp can be 140 DEG C, 160 DEG C, 175 DEG C or 190 DEG C etc.Therefore, technique of the present invention widely applicable, is applicable to the wrought magnesium alloys system of the multiple trades mark such as AZ system, ZK system or ZM system.
Claims (2)
1. improve a thermal treatment process for wrought magnesium alloys intensity, it is characterized in that: described magnesium alloy is AZ magnesium alloy system;
By small deformation amount cold rolling after, then through the artificial aging of different time, realize significantly improving of magnesium alloy strength, concrete technology step comprises:
1) magnesium alloy ingot is adopted to be raw material;
2) Homogenization Treatments of magnesium alloy ingot: the Homogenization Treatments carrying out magnesium alloy ingot in heat treatment furnace, temperature 400 DEG C, time 12h;
3) plastic extruding deformation: extruded on extrusion machine by the magnesium alloy ingot after Homogenization Treatments, extrusion temperature 390 DEG C, extrusion ratio is 11.7
4) cold rolling viscous deformation: rolling magnesium alloy being carried out on milling train 1 passage, its rolling reduction is 5-7.5%;
5) artificial aging: the magnesium alloy after cold rolling predeformation is carried out artificial aging, artificially aged temperature is 160-190 DEG C, and soaking time is 60-100h, and air cooling is to room temperature.
2. improve a thermal treatment process for wrought magnesium alloys intensity, it is characterized in that: described magnesium alloy is ZK series magnesium alloy system;
By small deformation amount cold rolling after, then through the artificial aging of different time, realize significantly improving of magnesium alloy strength, concrete technology step comprises:
1) magnesium alloy ingot is adopted to be raw material;
2) Homogenization Treatments of magnesium alloy ingot: the Homogenization Treatments carrying out magnesium alloy ingot in heat treatment furnace, temperature 420 DEG C, time 12h;
3) plastic extruding deformation: the magnesium alloy ingot after Homogenization Treatments is extruded on extrusion machine, extrusion temperature 390 DEG C, extrusion ratio is 11.7;
4) cold rolling viscous deformation: rolling magnesium alloy being carried out on milling train 1 passage, its rolling reduction is 5-7.5%;
5) artificial aging: the magnesium alloy after cold rolling predeformation is carried out artificial aging, artificially aged temperature is 160-190 DEG C, and soaking time is 50h, and air cooling is to room temperature.
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| CN101348890A (en) * | 2008-08-13 | 2009-01-21 | 重庆大学 | Heat treatment process improving high strength wrought magnesium alloy damping performance |
| CN102127725A (en) * | 2011-02-21 | 2011-07-20 | 中南大学 | Method for preparing high-strength high-toughness magnesium alloy plate strip |
| CN102828133A (en) * | 2012-09-20 | 2012-12-19 | 中南大学 | Method for preparing ultrahigh strength high toughness magnesium alloy |
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| CN101348890A (en) * | 2008-08-13 | 2009-01-21 | 重庆大学 | Heat treatment process improving high strength wrought magnesium alloy damping performance |
| CN102127725A (en) * | 2011-02-21 | 2011-07-20 | 中南大学 | Method for preparing high-strength high-toughness magnesium alloy plate strip |
| CN102828133A (en) * | 2012-09-20 | 2012-12-19 | 中南大学 | Method for preparing ultrahigh strength high toughness magnesium alloy |
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