CN103911569A - Method for weakening anisotropy of wrought magnesium alloy product - Google Patents
Method for weakening anisotropy of wrought magnesium alloy product Download PDFInfo
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Abstract
The invention relates to a method for weakening anisotropy of a wrought magnesium alloy product. The method includes: (1) conducting homogenization treatment on a magnesium alloy ingot; (2) subjecting the magnesium alloy ingot to multidirectional forging, taking a cuboid magnesium alloy blank with a square bottom surface, and ensuring the ratio of the height to the bottom edge less than 2; for a cylinder magnesium alloy ingot, firstly forging it into a cuboid so as to accord with the provisions of the cuboid magnesium alloy blank; marking side A, side B, and side C on the cuboid magnesium alloy blank, keeping the side A perpendicular to a longest side, and determining the side B and the side C arbitrarily; keeping the side A horizontal during first pass upsetting, keeping the side B horizontal during second pass upsetting, and keeping the side C horizontal during third pass upsetting, repeating the operation to 6-12 passes, and controlling the reduction per pass delta h at 10%h-40%h, with the h being the height of the magnesium alloy blank before forging per pass; and (3) conducting subsequent pressure processing on the multi-directionally forged magnesium alloy ingot. The method provided by the invention can effectively weaken the anisotropy of wrought magnesium alloy's mechanical properties.
Description
Technical field
The present invention relates to one and can effectively weaken the anisotropic method of wrought magnesium alloys product.
Background technology
Adopt " reference frame " to describe macroscopical polycrystalline material, it is a rectangular coordinate system, is made up of three orthogonal coordinate axis x, y, z; Adopt " crystal coordinates system " to describe single crystal, its coordinate axis is made up of [100], [010] and [001].When [100] of single crystal, [010] and [001] parallel with the x, y and z axes of " reference frame " and in the same way time, people claim this single crystal to have " initial orientation " respectively.Orientation has been described a crystal grain (single crystal) from " initial orientation " is with respect to the rotary state of " reference frame ", the arrangement mode of " the crystal coordinates axle " that orientation has also been expressed a crystal grain in " reference frame ".Concentrate while being distributed near a certain or some position of orientation when the orientation of many crystal grain, this material has had texture.
The magnesium alloy ingot of preparing with the common process such as swage or sand mold casting; its inner crystal grain is conventionally without obvious texture; but in the plastic histories such as forging subsequently, extruding, rolling, drawing, can and twinly crystal grain be rotated form deformation texture due to slippage.Its reason is: according to Von Mises criterion, multicrystal viscous deformation needs five independently slip systems, having in the magnesium alloy of Patterns for Close-Packed Hexagonal Crystal structure, <c+a> slippage can provide five independent slip systems (strain along c-axis can only be provided by twin and <c+a> slippage), and basal plane <a> slippage only can provide two, but, in magnesium alloy, the critical resolved shear stress of <c+a> slippage is approximately 2.5 times of basal plane <a> slippage, therefore the shared proportion of magnesium alloy basal plane <a> slippage in plastic history is considerably beyond conical surface <c+a> slippage, so under the effect of external pressurized stress field, basal plane <a> slippage rotates deformed grains, and make gradually (0001) basal plane perpendicular to stress direction, this just causes the tissue after viscous deformation to occur strong basal plane texture.
Magnesium alloy is in extrusion process, and (0001) basal plane can be parallel with the direction of extrusion (ED) with <10-10> crystal orientation; In the operation of rolling, (0001) basal plane can be parallel to and rolls plate surface, and <10-10> crystal orientation can be parallel to rolls to (RD).The generation of above-mentioned deformation texture can cause mechanical property to occur anisotropy.Because the symmetry of Patterns for Close-Packed Hexagonal Crystal structure is lower than cubic crystal structure, therefore, compared with wrought aluminium alloy, the Mechanical Property Anisotropy of wrought magnesium alloys is more serious, and this becomes the principal element of the magnesium alloy large-sized squeeze wood of restriction and rolled plate development.Have bibliographical information: for AZ81 magnesium alloy extrusion, the tensile yield strength of its ED apparently higher than TD(perpendicular to the direction of extrusion); For AZ31 magnesium alloy rolling plates, RD(roll to) tensile yield strength lower than TD(perpendicular to rolling direction).It is worth mentioning that, add the magnesium alloy of rare earth element, because <c+a> slippage is easily activated, so final deformation texture intensity a little less than, this may come from rare earth element and changed the stacking fault energy of system.Under normal circumstances, improve texturing temperature and accelerate rate of deformation and can weaken texture, thereby weaken Mechanical Property Anisotropy, this be because, along with the raising of texturing temperature, particularly more than 225 ℃ time, except basal plane <a> slippage and the conical surface twin, the potential slip system of cylinder and the conical surface is activated, and the difference of the critical resolved shear stress of each slip system reduces, the deformability of magnesium alloy significantly promotes, and the intensity of texture weakens thereupon.Improve Deformation velocity and can cause temperature rise on the one hand, on the other hand, when temperature is higher, the reply that the Plastic Deformation Mechanism of polycrystalline magnesium alloy comprises dislocation glide, intercrystalline slip, crystal boundary and intracrystalline and dynamic recrystallization, these processes are all subject to speed control, and therefore Deformation velocity can produce material impact to these processes.According to bibliographical information, (0001) basal plane texture of AZ81 magnesium alloy weakens along with the increase of Deformation velocity.
Multiway forging technique belongs to large plastometric set, can prepare ultrafine-grained (UFG) microstructure, and the essence of this technique is: from different directions magnesium alloy blank is carried out to jumping-up and pulling repeatedly.Can select isothermal multiway forging for the magnesium alloy materials that plasticity is poor, that is: after every a time distortion, all melt down annealing, object is to subdue unrelieved stress and by Static Recrystallization crystal grain thinning, improve plasticity, but control soaking time well, prevent serious grain growth; For the good alloy of plasticity, can adopt cooling multiway forging, that is: reduce the number of times of annealing between passage.In multiway forging cogging process, because plus load direction changes, material internal forms orientation deformation bands different, interlaced with each other, and deformation bands intersection piling up of dislocations is serious, is conducive to cause dynamic recrystallization.After multiway forging, failing to act and thinking in the same way of the various defects in ingot casting and grain-size significantly weakened, dynamic recrystallization crystal grain thinning very effectively repeatedly, and in addition, multiway forging technique can not cause new deformation texture.Have bibliographical information, as cast condition AZ80 alloy is after the multiway forging of 7 passages, and average grain size is reduced to 1 ~ 2 μ m by 126 μ m, and yield strength rises to 259MPa by 128MPa, and unit elongation rises to 7% by 3%.The present invention is intended to multiway forging technique to be used as cogging means, serves the viscous deformation such as follow-up extruding and rolling, weakens deformation texture and weakens anisotropic object thereby realize.Because grain refining has increased the surface-area of crystal boundary, thereby make " intercrystalline slip deformation mechanism " in total deformation, account for enough large deal, except basal slip and twin, distortion has been coordinated in the slippage of a large amount of crystal boundaries, thereby makes texture attenuation.Therefore, multiway forging can not only effectively weaken " Mechanical Property Anisotropy " of wrought magnesium alloys as cogging means, can also effectively suppress macroscopical distortion that in deformation process, appearance cannot be corrected (as: bending, wave, lateral bending and the torsion etc. of distortion material), thereby improve conforming product rate.
Summary of the invention
The object of the present invention is to provide a kind of method that can effectively weaken wrought magnesium alloys Mechanical Property Anisotropy.
For achieving the above object, take following technical scheme:
A kind of anisotropic method of wrought magnesium alloys product that weakens, the method comprises the steps:
(1), magnesium alloy ingot is carried out to homogenizing processing;
(2), after magnesium alloy ingot homogenizing processes, after coming out of the stove, magnesium alloy ingot carries out multiway forging immediately, is to adopt rectangular parallelepiped magnesium alloy blank for magnesium alloy ingot, bottom surface be square, guarantees that the ratio on high and base is less than 2; For right cylinder magnesium alloy ingot, the first side of beating, to meet the regulation of above-mentioned rectangular parallelepiped magnesium alloy blank; Will mark A, B, tri-faces of C for rectangular parallelepiped magnesium alloy blank, wherein, A face is vertical with longest edge, and B face and C face can be determined arbitrarily; When the first passage jumping-up, A face is positioned at up and down, when the second passage jumping-up, B face is positioned at up and down, when the 3rd passage jumping-up, C face is positioned at up and down, so circulation, it is every time forging and stamping height of magnesium alloy magnesium alloy blank before that draught per pass Δ h is controlled at 10%h-40%h(h, different passages, h can change), carry out altogether 6-12 passage;
(3), the magnesium alloy ingot blank after multiway forging is carried out to packing pressure processing.
In the anisotropic method of reduction wrought magnesium alloys product of the present invention, in described step (2), described magnesium alloy ingot blank and the temperature of flat anvil all will be controlled in the temperature range that will forge.
There are following two kinds of situations for multiway forging: a kind of situation is cooling multiway forging; Another kind of situation is isothermal multiway forging.
For cooling multiway forging, generally, once can carry out multi-pass forging and without melting down, but monitor constantly magnesium alloy ingot blank and flat anvil temperature with temperature measuring gauge; If magnesium alloy ingot blank temperature is or/and flat anvil temperature, lower than the lower limit of the temperature range of forging, is melted down temperature raising or/and flat anvil melts down heating by magnesium alloy ingot blank; If flat anvil temperature is lower than the lower limit of temperature range forging, heat exchange flat anvil more in the situation that having flat anvil for subsequent use; For isothermal multiway forging, after every time, magnesium alloy ingot blank and flat anvil all must melt down temperature raising.
In the anisotropic method of reduction wrought magnesium alloys product of the present invention; in described step (2); in the time determining the temperature range of forging; will be take alloy equilibrium phase diagram as basis; and with reference to plasticity chart, drag figure and recrystallize figure; determining of the initial forging temperature forging will guarantee that magnesium alloy ingot blank does not produce overheated and burning in heat-processed, and the final forging temperature of forging is normal substantially higher than the recrystallization temperature of magnesium alloy ingot blank.
In the anisotropic method of reduction wrought magnesium alloys product of the present invention, in described step (2), the position that described magnesium alloy ingot blank is contacted with flat anvil is lubricated.
In the anisotropic method of reduction wrought magnesium alloys product of the present invention, to the magnesium alloy ingot blank after multiway forging carry out packing pressure first being processed be described step (3) before, carry out pre-treatment forging to magnesium alloy ingot blank; For extruding, carry out round as a ball smooth with end face to magnesium alloy ingot blank according to container diameter; For rolling, magnesium alloy ingot blank is spreaded and be pulled out according to milling train specification.
The advantage of the anisotropic method of reduction wrought magnesium alloys product of the present invention is that the method can effectively weaken wrought magnesium alloys Mechanical Property Anisotropy.
Accompanying drawing explanation
Fig. 1 is multiway forging artwork.
Embodiment
The anisotropic method of reduction wrought magnesium alloys product of the present invention, comprises the steps:
Step 1, carries out homogenizing processing to ingot casting.
Step 2, ingot casting carries out multiway forging immediately after coming out of the stove, adopt rectangular parallelepiped magnesium alloy blank, and bottom surface is preferably square, guarantees that the ratio on high and base is less than 2; For right cylinder ingot casting, the first side of beating before multiway forging.The specific embodiment of multiway forging is shown in Fig. 1.First on initial square billet, A, B, tri-faces of C have been marked with asphalt blocks, also need if desired to mark the vertical heart point (center of rounded bottom surface) of right cylinder ingot casting, make A face and longest edge (high to) vertical, B and C face can determine arbitrarily, and after this A, B and C face do not rechange.As shown in Figure 1, first carry out the first passage jumping-up, when the first passage jumping-up, A face is positioned at up and down, after jumping-up, overturn again, carry out second time jumping-up after upset, the second passage B face is positioned at up and down, after jumping-up, overturn again, after upset, carry out the 3rd passage jumping-up, the 3rd passage C face is positioned at up and down, so circulation.It is every time forging and stamping height of magnesium alloy magnesium alloy blank before that draught per pass Δ h is controlled at 40%h(h, different passages, h can change) left and right, according to practice, when road number of times reaches 6-12 time, the volume fraction of the fine grained region of being caused by dynamic recrystallization will level off to maximum value, that is: continue to increase and forge passage, and fine grained region volume fraction no longer increases (or increasing extremely slow).The temperature of ingot blank and flat anvil will guarantee in suitable temperature range, will be take alloy equilibrium phase diagram as basis in the time determining forging range, and with reference to plasticity chart, drag figure and recrystallize figure, determining of initial forging temperature will guarantee that magnesium alloy blank does not produce overheated and burning in heat-processed, and final forging temperature is often a little more than its recrystallization temperature, the too low meeting of final forging temperature causes resistance to deformation to increase and work hardening, thereby causes cracking.For cooling multiway forging, once can carry out multi-pass forging and without melting down, but monitor constantly ingot blank and flat anvil temperature with temperature measuring gauge, if flat anvil temperature is lower than the lower limit of temperature range, ingot blank is melted down to temperature raising, if flat anvil temperature, lower than temperature range lower limit, is melted down heating by flat anvil, heat exchange flat anvil more in the situation that having flat anvil for subsequent use; For isothermal multiway forging, after every time, ingot blank and flat anvil all must melt down temperature raising.In forging process, sufficient lubrication is wanted at the position that ingot blank contacts with flat anvil.For coordinating deformation after unloading, after multiway forging, to carry out pre-treatment forging to ingot blank, for extruding, carry out round as a ball and end face to ingot blank according to container diameter smooth, for rolling, spread and pull out according to milling train specification.
Step 3, carries out packing pressure processing to the ingot blank after multiway forging.In order to weaken " Mechanical Property Anisotropy ", need suitably improve texturing temperature and accelerate Deformation velocity.
Embodiment 1:
The early stage method that adopts ingot casting directly to push, is processed into by the AZ80 magnesium alloy ingot of Φ 470mm × 1400mm (railway carriage after semicontinuous casting technique preparation) bar that sectional dimension is 230mm × 140mm.Detailed process is as follows:
(1) ingot casting is carried out to homogenizing processing (410 ℃/24h);
(2) ingot casting enters container immediately after coming out of the stove, and container diameter of phi 650mm(extrusion ratio is 10.3), 360 ℃ of container temperature.Before extruding, first use blind mould by ingot casting jumping-up.When formal extruding, extrusion speed is 30 mm/min, and the type of cooling is online spray quench.
(3) after bar sawing, carry out peak ageing treatment (170 ℃/24h).
(4) measure longitudinally (being parallel to the direction of extrusion), horizontal (being parallel to 230mm direction), the high room temperature tensile performance to (being parallel to 140mm direction).For each direction, respectively get three tension specimens from epidermis and heart portion, then get the mean value of six data.The bar obtaining for " the direct extrusion process of ingot casting ", its longitudinally, laterally and high to mechanical property in table 1.Can find, there is strong anisotropy in extruded bars, although longitudinally performance meets service requirements, longitudinal and high to not up to standard.
In order to weaken the anisotropy of extruded bars, the later stage adopts " multiway forging cogging+extruding " technique.Wherein, homogenizing, extruding and aging technique are all consistent with direct extrusion.Multiway forging technique is:
Forge and carry out 410 ℃ ~ 330 ℃ temperature ranges.After homogenizing is processed, first the side of beating, before beating side, mark and found heart point (center of circle of the upper and lower rounded face of starting ingot) with asphalt blocks, the size of beating behind side is about 550mm × 550mm × 800mm, the central point of guaranteeing 550mm × 550mm face is vertical heart point, beat Fang Houyong and again mark vertical heart point, and one group of parallel surface of 550mm × 550mm is labeled as to A, other two groups of parallel surfaces are labeled as respectively B and C(note: in multiway forging process, will constantly confirm and again mark vertical heart point, guaranteeing that round as a ball rear vertical heart point can reset into the center of upper and lower section).The first passage jumping-up is placed in A face up and down, the second passage is placed in B face up and down, the 3rd passage is placed in C face up and down, so circulation, carries out 6 passages altogether, and the draught of each passage is that 40%h(h is every time forging and stamping height of magnesium alloy magnesium alloy blank before, different passages, h can change), for extenuating harmful unrelieved stress that large plastometric set brings and promoting plasticity, after first, fourth passage, ingot blank is melted down to insulation 30 minutes.After multiway forging finishes, square billet is round as a ball, must guarantee initially to stand heart point still at the center of upper and lower circular end surface.Before every a time jumping-up, be lubricated ingot blank and flat anvil contact surface, and thermometric is carried out in ingot casting surface and flat anvil heart portion, guarantee that temperature is greater than 330 ℃.Ingot casting after round as a ball enters container immediately, before extruding, still carries out jumping-up with blind mould.
Bar prepared by " multiway forging+extruding " technique, it is longitudinal and transverse, height in table 1, can find that Mechanical Property Anisotropy significantly weakens to performance, has laterally met service requirements with high to performance.
Longitudinal and transverse, the high mechanical property of table 1. " directly extruding " and " multiway forging+extruding " AZ80 bar
Embodiment 2:
1000mm × 730mm × 165mm AZ31 slab ingot is processed into the slab that thickness is 60mm by the common hot rolling method of early stage employing.Detailed process is as follows:
(1) slab ingot is carried out to homogenizing thermal treatment (420 ℃/24h), the air cooling of coming out of the stove.
(2) slab ingot carry out milling face, milling depth 10mm.
(3) slab ingot heats again, 450 ℃/6h.
(4) slab ingot is transferred to immediately after coming out of the stove on duo mill and is carried out hot rolling, 450 ℃ of start rolling temperatures, 300 ℃ of finishing temperatures.Through six passages, thickness is pressed down to 60mm by 145mm, reduction in pass is between 10% ~ 20%, and the draught of six passages is followed successively by 10%, 13%, 15%, 18%, 15% and 9%, and hot rolling finishes to carry out air-cooled to slab afterwards.
(5) slab is carried out to finishing.On roller leveler, align, then carry out trimming.
(6) the room temperature tensile performance of survey RD and TD direction.RD mechanical property is: tensile strength 230MPa, yield strength 184MPa, unit elongation 12%; TD mechanical property is: tensile strength 305MPa, yield strength 235MPa, unit elongation 19%.Hence one can see that, and common hot rolling AZ31 slab has serious anisotropy, and RD yield strength is not up to standard.
Consider subsequently, before hot rolling, ingot casting is carried out to multiway forging cogging, adopt Φ 550mm × 600mm semicontinuous casting AZ31 billet, its specific embodiment is:
(1) billet is carried out to sufficient homogenizing processing, 420 ℃/24h.
(2) billet carries out multiway forging immediately after coming out of the stove, and the temperature range of forging is 420 ℃ ~ 350 ℃.First by the billet side of beating, before the side of beating, with the vertical heart point of asphalt blocks mark, the size behind the side of beating is about 450mm × 450mm × 700mm, guarantee that the vertical heart point of billet is positioned at 450mm × 450mm Mian center.On square billet, mark A, B and C with asphalt blocks, allow 450mm × 450mm face be A face, other two groups of parallel surfaces are respectively B and C face.In forging process, to constantly confirm vertical heart point, repeatedly mark.When the first passage jumping-up, A face is positioned at up and down, the second passage B face is positioned at up and down, the 3rd passage C face is positioned at up and down, so circulation, carries out six passages, altogether for subduing unrelieved stress, after the first passage jumping-up, melt down 30 minutes (420 ℃) of insulation, the draught of every a time is that 40%h(h is every time forging and stamping height of magnesium alloy magnesium alloy blank before, different passages, h can change).After multiway forging finishes, melt down 40 minutes (420 ℃) of insulation.The laggard line width of coming out of the stove is opened up and pulling, final forging board size is 1000mm × 730mm × 195mm, guarantee that vertical heart point is positioned at 730mm × 195mm Mian center of slab, for preventing grain growth, spread and after pulling finishes, immediately slab is placed in to the hot water tank that water temperature is greater than 80 ℃ and quenches.Multiway forging and spreading in pulling process, the temperature that constantly follow the tracks of magnesium alloy blank and flat anvil with temperature measuring gauge, once temperature lower than 350 ℃, ingot casting melts down (soaking time is no more than 1 hour) or changes flat anvil.
(3) carry out " milling face-heating-hot rolling-finishing " to forging plate, detailed process is identical with early stage common hot rolling.
(4) the room temperature tensile performance of survey RD and TD direction.RD mechanical property is: tensile strength 285MPa, yield strength 223MPa, unit elongation 14%; TD mechanical property is: tensile strength 308MPa, yield strength 241MPa, unit elongation 18%.The RD yield strength of the 60mm slab of processing through " multiway forging cogging+common hot rolling " has met service requirements, and this has benefited from anisotropic reduction.
Claims (5)
1. weaken the anisotropic method of wrought magnesium alloys product, it is characterized in that, the method comprises the steps:
(1), magnesium alloy ingot is carried out to homogenizing processing;
(2), after magnesium alloy ingot homogenizing processes, after coming out of the stove, magnesium alloy ingot carries out multiway forging immediately, is to adopt rectangular parallelepiped magnesium alloy magnesium alloy blank for magnesium alloy ingot, bottom surface be square, guarantees that the ratio on high and base is less than 2; For right cylinder magnesium alloy ingot, the first side of beating, to meet the regulation of above-mentioned rectangular parallelepiped magnesium alloy magnesium alloy blank; Will mark A, B, tri-faces of C for rectangular parallelepiped magnesium alloy blank, wherein, A face is vertical with longest edge, and B face and C face can be determined arbitrarily; When the first passage jumping-up, A face is positioned at up and down, and when the second passage jumping-up, B face is positioned at up and down, and when the 3rd passage jumping-up, C face is positioned at up and down, so circulation, draught per pass Δ h is controlled at 10%h-40%h, wherein, h is every time forging and stamping height of magnesium alloy blank before, carries out altogether 6-12 passage;
(3), the magnesium alloy ingot blank after multiway forging is carried out to packing pressure processing.
2. the anisotropic method of reduction wrought magnesium alloys product according to claim 1, is characterized in that, in described step (2), described magnesium alloy ingot blank and the temperature of flat anvil all will be controlled in the temperature range that will forge.
3. the anisotropic method of reduction wrought magnesium alloys product according to claim 1 and 2; it is characterized in that; in described step (2); in the time determining the temperature range of forging; will be take alloy equilibrium phase diagram as basis; and with reference to plasticity chart, drag figure and recrystallize figure, determining of the initial forging temperature of forging will guarantee that magnesium alloy ingot blank does not produce overheated and burning in heat-processed, and the final forging temperature of forging is normal substantially higher than the recrystallization temperature of magnesium alloy ingot blank.
4. the anisotropic method of reduction wrought magnesium alloys product according to claim 1, is characterized in that, in described step (2), the position that described magnesium alloy ingot blank is contacted with flat anvil is lubricated.
5. the anisotropic method of reduction wrought magnesium alloys product according to claim 1, is characterized in that, to the magnesium alloy ingot blank after multiway forging carry out packing pressure first being processed be described step (3) before, carry out pre-treatment forging to magnesium alloy ingot blank; For extruding, carry out round as a ball smooth with end face to magnesium alloy ingot blank according to container diameter; For rolling, magnesium alloy ingot blank is spreaded and be pulled out according to milling train specification.
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| CN105483580A (en) * | 2014-09-15 | 2016-04-13 | 中国科学院金属研究所 | AZ61 magnesium alloy with weak-basal/non-basal texture and low anisotropy, and preparation method of AZ61 magnesium alloy |
| CN105483580B (en) * | 2014-09-15 | 2018-02-13 | 中国科学院金属研究所 | A kind of weak/non-basal plane texture, less anisotropy AZ61 magnesium alloys and preparation method thereof |
| CN105274457A (en) * | 2015-10-23 | 2016-01-27 | 成都天智轻量化科技有限公司 | 3D super-plasticizing treatment method and superplasticity precision shaping method for magnesium alloy |
| CN106391961A (en) * | 2016-11-29 | 2017-02-15 | 沈阳黎明航空发动机(集团)有限责任公司 | Free forging method of TA12A square forged piece |
| CN106391961B (en) * | 2016-11-29 | 2019-09-24 | 中国航发沈阳黎明航空发动机有限责任公司 | A kind of open die forging method of TA12A square forging |
| CN107009094A (en) * | 2017-03-23 | 2017-08-04 | 中南大学 | The integrated preparation technology of the strong high temperature resistant magnesium alloy shell part forging rolling of major diameter superelevation |
| CN107130197A (en) * | 2017-05-25 | 2017-09-05 | 西安航空学院 | A kind of deformation heat treatment method of Ultra-fine Grained AZ80 magnesium alloys |
| CN107649628A (en) * | 2017-09-19 | 2018-02-02 | 陕西华镁特材科技有限公司 | A kind of processing method of ZK61 high-strength magnesium alloys forging |
| CN107649628B (en) * | 2017-09-19 | 2018-08-31 | 陕西华镁特材科技有限公司 | A kind of processing method of ZK61 high-strength magnesium alloys forging |
| CN108246945A (en) * | 2017-12-13 | 2018-07-06 | 陕西宏远航空锻造有限责任公司 | A kind of forging method for improving heat-resisting steel forgings impact property |
| CN108715983A (en) * | 2018-05-25 | 2018-10-30 | 湖南工学院 | A kind of less anisotropy ZK21 wrought magnesium alloys block materials preparation method |
| CN108642417A (en) * | 2018-05-25 | 2018-10-12 | 湖南工学院 | A kind of Ultra-fine Grained Mg-3Al-1Zn alloy short flow processes |
| CN108642415A (en) * | 2018-05-25 | 2018-10-12 | 湖南工学院 | A kind of bimodal tissue ZK21 magnesium alloy preparation methods that crystal grain distribution is controllable |
| CN108754365A (en) * | 2018-05-25 | 2018-11-06 | 湖南工学院 | A kind of high density twin structure ZK21 magnesium alloy block materials preparation methods |
| CN108396214A (en) * | 2018-05-25 | 2018-08-14 | 湖南工学院 | A kind of bimodal tissue Mg-6Zn-0.45Zr alloy preparation methods |
| CN111893409B (en) * | 2020-08-05 | 2021-08-03 | 中南大学 | High-energy-absorption superfine crystal magnesium alloy and preparation method thereof |
| CN111893409A (en) * | 2020-08-05 | 2020-11-06 | 中南大学 | High-energy-absorption superfine crystal magnesium alloy and preparation method thereof |
| CN114505428A (en) * | 2020-11-17 | 2022-05-17 | 中国科学院金属研究所 | Forging process of near-isotropic, high-strength and high-plasticity Mg-Gd-Y-Zr alloy material |
| CN112792271A (en) * | 2020-12-22 | 2021-05-14 | 西南铝业（集团）有限责任公司 | 7050 alloy forging production process |
| CN113843387A (en) * | 2021-09-26 | 2021-12-28 | 中南大学 | High-strength heat-resistant magnesium alloy large forging and preparation method thereof |
| CN113843387B (en) * | 2021-09-26 | 2022-06-28 | 中南大学 | High-strength heat-resistant magnesium alloy large forging and preparation method thereof |
| CN114178454A (en) * | 2021-11-15 | 2022-03-15 | 有研工程技术研究院有限公司 | Preparation method of magnesium-lithium alloy hollow component with complex section |
| CN114178454B (en) * | 2021-11-15 | 2024-06-07 | 有研工程技术研究院有限公司 | Preparation method of magnesium-lithium alloy hollow member with complex section |
| CN114147157A (en) * | 2021-12-20 | 2022-03-08 | 江阴市龙玉锻压有限公司 | Turning forging process of large cake forging |
| CN114700386A (en) * | 2022-03-25 | 2022-07-05 | 重庆大学 | Method for simultaneously improving strength and plasticity of pure magnesium plate |
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Application publication date: 20140709 |