CN101298653A - High-strength high-toughness AZ91 magnesium alloy strip eletrotoughening process method and system - Google Patents
High-strength high-toughness AZ91 magnesium alloy strip eletrotoughening process method and system Download PDFInfo
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- CN101298653A CN101298653A CNA2008100674530A CN200810067453A CN101298653A CN 101298653 A CN101298653 A CN 101298653A CN A2008100674530 A CNA2008100674530 A CN A2008100674530A CN 200810067453 A CN200810067453 A CN 200810067453A CN 101298653 A CN101298653 A CN 101298653A
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Abstract
The invention discloses an electro-strengthening and toughening processing method of a belt material of AZ91 magnesium alloy and a system thereof. The electro-strengthening and toughening processing method comprises following steps: when the belt material of magnesium alloy is transmitted at a certain speed which is driven by a roller on an electro plastic rolling machine, high-energy impulse current that is output by an impulse power source through an electrode is input into an electriferous region section of the moving belt material of magnesium alloy, and the Joule heating effect and the non-heating effect are generated in the electriferous region section, thus causing the phase transition of internal microscopic constitution from bulky lath-shaped Beta-Mg17Al12 that are gathering and agglomerating in an initial state to Beta-Mg17Al12 particles that are evenly distributed and approximately sphere-shaped, or causing the solid solution effect that leads Beta-Mg17Al12 to be dissolved in a substrate; the processed belt material can be naturally air cooled at room temperature. The electro-strengthening and toughening processing method of the belt material of AZ91 magnesium alloy has short processing time and high production efficiency, and simultaneously avoids the high-temperature oxidation of the magnesium alloy. After the electro-strengthening and toughening processing, the microscopic constitution of the belt material of magnesium alloy can be remarkably improved, the unit extension of the microscopic constitution is increased from 11.8 percent in the initial aging state to over 20 percent, and the tensile strength of the microscopic constitution is not dramatically lowered.
Description
Technical field
The present invention relates to the patent technology of magnesium alloy strip, particularly a kind of electricity of high-strength and high ductility AZ91 magnesium alloy strip causes strength-toughening treatment process and treatment system, causes the AZ91 magnesium alloy strip that strength-toughening treatment process can obtain to have high strength and high tenacity by this electricity.
Background technology
Along with global energy dilemma and problem of environmental pollution are on the rise; in order to cut down the consumption of energy and to reduce the environmental pollution that motor vehicle exhaust causes; the lightweight of automobile has become each big automobile dealer of the world and has developed the trend of high-end and practical automobile product, and adopts magnesium alloy to replace automobile to become a kind of inevitable with the own wt that reduces automobile with aluminium alloy even ferrous materials.Particularly magnesium alloy is as the lightest engineering metal structured material, have that light specific gravity, specific tenacity and specific rigidity height, thermal conductivity are good, the electromagnetic shielding ability strong, damping vibration attenuation is good, machinability is good and advantage such as easy recovery, make it to obtain increasingly extensive attention and application, so the MAGNESIUM METAL alloy is described as the green engineering material of tool development prospect " 21 century " in communications and transportation industry, military affairs and fields such as electronics, information industry.
In recent years, the AZ91 magnesium alloy obtains development at full speed as one of most important commercial magnesium alloy and uses widely, but the overwhelming majority is the diecast magnesium alloy product, but because there is the defective that is difficult to avoid in diecast magnesium alloy itself, can not cross the requirement etc. that thin and performance is difficult to satisfy the carrying component as casting flaw (cavity, loose, crackle and be mingled with etc.), wall thickness, therefore limit diecast magnesium alloy to a great extent and further used.If the AZ91 magnesium alloy is carried out suitable distortion and subsequent heat treatment (as solid solution and timeliness), can increase substantially its intensity and toughness, and the AZ91 magnesium alloy of this more high strength, more diversified mechanical property should have market application foreground and more wide development space widely.
The tissue of general casting AZ91 magnesium alloy is by α-Mg and β-Mg
17Al
12Form wherein most β-Mg
17Al
12Be thick net distribution at crystal boundary, a spot of particulate state β-Mg
17Al
12Be distributed in intracrystalline.The research report is arranged, can make β-Mg through overaging again after the Mg-Al-Zn series magnesium alloy deformation
17Al
12Form with continuous precipitate is even, disperse is distributed in crystal boundary and intracrystalline, thereby improves its intensity and toughness.However, the AZ91 magnesium alloy still has a large amount of thick lath-shaped β-Mg through after the above-mentioned processing
17Al
12At crystal boundary, even at many regional areas a large amount of β-Mg that in flakes, unite have appearred with semi-continuous net distribution
17Al
12The group.The AZ91 magnesium alloy that has a this tissue is in follow-up distortion or bearing in the process of external load lath-shaped β-Mg that the crystal boundary place is thick
17Al
12With β-Mg in blocks
17Al
12Group place is easy to generate stress concentration, forms formation of crack and cracks, and make the too early inefficacy of material and be unfavorable for follow-up moulding, so β-Mg
17Al
12Quantity, distribution and shape characteristic had a strong impact on the mechanical property of AZ91 magnesium alloy.Clearly, if further improve toughness and its follow-up forming ability of AZ91 magnesium alloy on this basis, has only the β of improvement-Mg
17Al
12Distribution and pattern make it to develop towards the direction that helps its toughness raising, and traditional solution heat treatment technology can improve the plasticity of AZ91 magnesium alloy to a certain extent, but because a large amount of β-Mg
17Al
12Dissolve in magnesium matrix and can seriously reduce its intensity.In addition, because solute atoms velocity of diffusion in solid phase is very slow in the magnesium alloy, there is Heating temperature height (more than 410 ℃) in the solid solution treatment process of general magnesium alloy, soaking time is long (decides on the interior size in batches of stove, general a few hours) and problem such as energy consumption is big, because Heating temperature height, soaking time are long, the surface of magnesium alloy is easy to oxidation, particularly in a single day the local surfaces oxidative phenomena appears in magnesium alloy plate, band, subsequent disposal is difficult to remove zone of oxidation, has a strong impact on the quality of follow-up molding procedure and the finished product; Simultaneously under long-time high-temperature condition, crystal grain takes place the AZ91 magnesium alloy easily grows up unusually, directly causes the material internal grain-size seriously inhomogeneous, grievous injury the final mechanical property of material.Moreover, technologies such as the type of heating of also necessary strict control magnesium alloy and rate of heating, in case in case type of heating and heat-up rate selection are improper, will produce material internal temperature inequality, local burning, finally cause the inhomogeneous and unsettled consequence of mechanical property of material inside organization after the solution treatment, so influence the factor complexity of prior heat treatment process, the production cost height.Therefore how to overcome the deficiency of magnesium alloy tradition solution heat treatment technology, study a kind of novel strength-toughening treatment process that has the AZ91 magnesium alloy of high-intensity high-tenacity simultaneously concurrently and just seem particularly important.
Summary of the invention
In order to overcome the above-mentioned deficiency of magnesium alloy tradition solution heat treatment technology, the electricity that the invention provides a kind of high-strength and high ductility AZ91 magnesium alloy strip causes strength-toughening treatment process and treatment system, the microstructure that causes the magnesium alloy strip of highly malleablized processing through electricity of the present invention is significantly improved, its unit elongation increases to more than 20% from 11.8% of aging state, and tensile strength does not significantly descend, and has avoided the oxidative phenomena of band simultaneously.
High-strength and high ductility AZ91 magnesium alloy strip electricity of the present invention causes strength-toughening treatment process, may further comprise the steps:
Decoiling equipment, wrap-up, roll and supporting roll tensioning by milling train are from the AZ91 magnesium alloy strip on the decoiling equipment, make the tight Elastic Contact of described magnesium alloy strip and roll, the rotation of driving roll, roll drive magnesium alloy strip by frictional force and transmit to the wrap-up direction with 0.2-100m/min speed;
Certain distance is provided with an Electical connector before roll, the high energy pulse electric current of high energy pulse power supply output is input to the electric imposing region of the magnesium alloy strip of the motion between roll and the Electical connector by this Electical connector and roll, the high energy pulse electric current produces joule heating effect and non-thermal effect at the electric imposing region of magnesium alloy strip, makes its inner microstructure by the original thick lath-shaped β-Mg that in flakes, unites
17Al
12Be phase-changed into equally distributed torulose β-Mg
17Al
12Particle or β-Mg
17Al
12Almost by complete solid solution in matrix, and matrix grain is not almost grown up; The natural air cooling at room temperature of magnesium alloy strip after the processing need not to import any extra heat-eliminating medium and forces cooling.
Wherein, the high energy pulse current parameters that is input to the electric imposing region of described magnesium alloy strip is: frequency 150-700Hz, pulse width 20-2300 μ s, the amplitude 400A/mm of current density
2-1000A/mm
2
Cause the highly malleablized processing requirements by electricity and obtain β-Mg
17Al
12During the spherodized structure of phase, the high energy pulse current parameters is: frequency 150-450Hz, pulse width 20-2300 μ s, the amplitude 400-800A/mm of current density
2
Cause the highly malleablized processing requirements by electricity and obtain β-Mg
17Al
12During solid solution structure, the high energy pulse current parameters is: frequency 400-700Hz, pulse width 20-2300 μ s, the amplitude 500-1000A/mm of current density
2
A kind of high-strength and high ductility AZ91 magnesium alloy strip that adopts above-mentioned technology to obtain, it is characterized in that: the heterogeneous microstructure of this band is equally distributed torulose β-Mg
17Al
12Particle, unit elongation are 1.6 times of unit elongation of the band that obtains of prior heat treatment process, and the matrix grain size is not almost grown up.
The another kind of high-strength and high ductility AZ91 magnesium alloy strip that adopts above-mentioned technology to obtain is characterized in that: the β-Mg in this band
17Al
12Almost completely solid solution is in matrix, and unit elongation is 1.9 times of unit elongation of the band that obtains of prior heat treatment process, and the matrix grain size is grown up a little.
A kind of magnesium alloy strip electricity of realizing above-mentioned technology causes the highly malleablized treatment system, comprising: a milling train, this milling train have roll, decoiling equipment, wrap-up and corresponding insulation system; And a high energy pulse power supply, this high energy pulse power supply provide the magnesium alloy strip electricity is caused the pulse width that highly malleablized handles is that 20-2300 μ s, frequency are the high energy pulse electric current of 150-700Hz;
In the both sides of frame topping roll first, second supporting roll is installed, the roll and first supporting roll as electrode all and between the frame insulate simultaneously, magnesium alloy strip from decoiling equipment is reeled tight through described first supporting roll, roll, second supporting roll to wrap-up, the tight Elastic Contact of magnesium alloy strip and roll, the roll of rotation drive magnesium alloy strip by frictional force and transmit to the wrap-up direction with certain speed; First supporting roll and roll are connected the positive and negative output terminal of high energy pulse power supply respectively, the high energy pulse power supply is input to the high energy pulse electric current by this first supporting roll and roll the electric imposing region of the magnesium alloy strip of the motion between first supporting roll and the roll, the high energy pulse electric current produces joule heating effect and non-thermal effect at the electric imposing region of magnesium alloy strip, this electric imposing region is carried out spheroidizing or the solution treatment that electricity causes highly malleablized, obtain β-Mg
17Al
12The spherodized structure of phase or β-Mg
17Al
12Solid solution structure.
The traditional thermal treatment process of the present invention and AZ91 magnesium alloy is compared has following unusual effect:
1, the electricity at the AZ91 magnesium alloy causes in the highly malleablized treating processes, moment, the high energy pulse electric current was directly inputted to important joule heating effect and the non-thermal effect of generation in the magnesium material, and under the coupling of heat effect and non-thermal effect, the vibrational energy of atom is sharply increased, simultaneously this moment high-octane pulsed current input greatly promoted the diffusion of material internal atom.In addition, the AZ91 magnesium alloy through after the suitable distortion again through overaging, the continuous precipitated phase β-Mg of a large amount of thick lath-shapeds has appearred in material internal
17Al
12Therefore, in magnesium material inside microcell resistivity inequality can appear, in case moment high energy electric pulse input can cause the micro-area temperature gradient, as because of at α-Mg matrix and β-Mg
17Al
12The phase interface place, β-Mg on the crystal boundary
17Al
12The resistivity at place is big and cause this place's temperature height, thus increased the magnesium matrix regional area solid solubility and solute atoms diffusibility, quickened β-Mg
17Al
12Decomposition course, thereby realize improving β-Mg
17Al
12In α-Mg intravital pattern of base and distribution.By microstructure analysis, the AZ91 magnesium alloy materials inside after we find to handle through suitable electric pulse parameter is by the original thick lath-shaped β-Mg that in flakes, unites
17Al
12Be phase-changed into equally distributed torulose β-Mg
17Al
12Particle, and matrix grain is not almost grown up.If further increase electric pulse parameter, we find a large amount of β-Mg
17Al
12Almost all decompose in α-Mg matrix, realized the effect of solution treatment, matrix grain had slightly and grew up this moment.Therefore, electricity causes the microstructure that strength-toughening treatment process has improved the AZ91 magnesium alloy effectively, thereby has increased substantially the toughness of material.
2, the AZ91 magnesium alloy strip of prior heat treatment process, its room temperature unit elongation increases, and intensity obviously descends; Electricity causes the AZ91 magnesium alloy strip that highly malleablized is handled, and its room temperature unit elongation obviously significantly improves, and reach more than 1.6 times of AZ91 magnesium alloy strip unit elongation of prior heat treatment process, and the strength degradation amplitude is very little.
3, electricity causes in the highly malleablized treating processes, the time that handle fully any point on the AZ91 magnesium alloy strip is in 10 seconds, and the processing top temperature is 250 ℃-350 ℃, well below 410 ℃ of prior heat treatment process temperature, thus low temperature and in the short period of time AZ91 magnesium alloy strip oxidative phenomena can not take place.
4, production efficiency height of the present invention is that a kind of electricity of efficient, novel acquisition high-strength and high ductility AZ91 magnesium alloy strip causes strengthening and toughening treatment method, can be implemented in the line continuous production, and it is widely used in the highly malleablized of heat-treatable strengthened magnesium alloy strip and handles.
Description of drawings
Fig. 1 causes highly malleablized treatment system synoptic diagram for magnesium alloy strip electricity of the present invention;
Fig. 2 is again through the microstructure of overaging after the AZ91 magnesium alloy deformation;
Fig. 3 handles back β-Mg for aging state AZ91 magnesium alloy causes highly malleablized through electricity
17Al
12The microstructure of nodularization;
Fig. 4 handles back β-Mg for aging state AZ91 magnesium alloy causes highly malleablized through electricity
17Al
12The microstructure of solid solution.
Embodiment
Further specify below in conjunction with accompanying drawing.
With reference to Fig. 1, the magnesium alloy strip electricity causes the highly malleablized treatment system and comprises the Electroplastic milling train, and this milling train has roll 2, decoiling equipment 5, wrap-up 6 and corresponding insulation system etc.; Further comprise a high energy pulse power supply 4, being used to the frequency of handling usefulness is provided is 150-700Hz, and pulse width is the high energy pulse electric current of 20-2300 μ s;
First supporting roll 1, second supporting roll 3 are installed on the frame of this milling train, first supporting roll 1, second supporting roll 3 are positioned at the both sides of roll 2, the roll 2 and first supporting roll 1 as electrode all and between the frame insulate simultaneously, magnesium alloy strip 7 from decoiling equipment 5 is reeled tight through described first supporting roll 1, roll 2, second supporting roll 3 to wrap-up 6, magnesium alloy strip and roll 2 close tight Elastic Contact, the roll 2 of rotation drive magnesium alloy strip 7 by frictional force and transmit to wrap-up 6 directions with certain speed; First supporting roll 1 and roll 2 are connected the positive and negative output terminal of high energy pulse power supply 4 respectively, high energy pulse power supply 4 is input to the high energy pulse electric current by this first supporting roll 1 and roll 2 electric imposing region 7 ' of the magnesium alloy strip of the motion between first supporting roll and the roll, the high energy pulse electric current produces joule heating effect and non-thermal effect at the electric imposing region 7 ' of magnesium alloy strip, this electric imposing region is carried out electricity cause the highly malleablized processing.Magnesium alloy strip after processing naturally cooling in air at room temperature, need not to import any extra heat-eliminating medium and forces cooling by wrap-up 6 rollings through second supporting roll 3.
Wherein, be necessary for Elastic Contact closely between roll 2 and the magnesium alloy strip 7, roll does not produce tangible viscous deformation to magnesium alloy strip 7, and the movement velocity of successive band 7 is 0.2-100mpm, and this speed can be adjusted by the velocity of rotation of roll.And the velocity of rotation of roll 2 is by the frequency transformer and the motor adjustment control (not drawing among the figure) of control roll rotation.
The power of high energy pulse power supply 4 can be 15KW, output pulse frequency 150-700Hz, and pulse width is 20-2300 μ s, when electricity caused the highly malleablized processing, the amplitude of the pulse current density in the load (being the electric imposing region 7 ' of magnesium alloy strip) was controlled at 400A/mm
2-1000A/mm
2Between.
First supporting roll 1 is to be 140mm by the diameter that a pair of employing copper-graphite is made, the conductive casters that width is about roll width constitutes, conductive casters and uncoiling magnesium material form certain cornerite, good to guarantee contact, reduce contact resistance, distance between the mid point of the mid point of the two conductive casters lines of centres and roll (the being negative pole) line of centres can be adjusted in the 10-800mm scope, this distance can be according to the sectional dimension of supplied materials, the state of supplied materials and the speed of rotation of roll are done suitable adjustment, sectional dimension as supplied materials is big more, the speed of rotation of roll is big more, the corresponding lengthening of the distance between two guide wheels then, vice versa.Conductive casters also can adopt the better and attrition resistant materials of electroconductibility such as dispersion-strengthened Cu or brass to make.
In above-mentioned treatment system, drive magnesium alloy strip when the wrap-up direction is transmitted at roll, the high energy pulse electric current of high energy pulse power supply output is input to the electric imposing region of the magnesium alloy strip of motion by first supporting roll and roll, it is carried out electricity cause the highly malleablized processing, treating processes is in the air of room temperature, need not assorted what extra heat-eliminating medium material is cooled off.At magnesium alloy strip electric imposing region input high energy pulse electric current this area segments being carried out electricity, to cause the temperature that highly malleablized handles be 250 ℃-350 ℃.The electric imposing region length of described magnesium alloy strip is 10-800mm.
For the speed of rotation of concrete different cross section size, different supplied materials state, different rolls with require high energy pulse to handle after obtain different state (β-Mg
17Al
12Nodularization or fully solid solution) magnesium ribbon, the processing parameter selection principle of the high energy pulse electric current of input is:
1). by surface action formula δ=(π * μ * f/ ρ)
-1/2, wherein μ, ρ, f are respectively magnetic permeability, resistivity, frequency, and δ is the thickness that electric current infiltrates.The sectional dimension that is the magnesium material is more little, and the high energy successive pulse frequency of corresponding input can increase.
2). with require high energy electric pulse to handle after obtain β-Mg
17Al
12Spherodized structure is compared, and high energy electric pulse obtains β-Mg after handling
17Al
12The pulse-repetition of the tissue of solid solution or current density amplitude are corresponding wants big.
By a large amount of experiment confirms, require to obtain β-Mg
17Al
12During the spherodized structure of phase, the high energy pulse current parameters is: frequency 150-450Hz, pulse width 20-2300 μ s, the current density amplitude 400-800A/mm of load
2
Requirement obtains β-Mg
17Al
12During solid solution structure, the high energy pulse current parameters is: frequency 400-700Hz, pulse width 20-2300 μ s, the current density amplitude 500-1000A/mm of load
2
3). the hardness of supplied materials and the speed of rotation of roll are big more, and width, frequency or the current density amplitude of the high energy successive pulse electric current of input should just can reach due effect greatly more.
The high-strength and high ductility AZ91 magnesium alloy strip of a kind of state that technology of the present invention obtains, its heterogeneous microstructure is equally distributed torulose β-Mg
17Al
12Particle, unit elongation are 1.6 times of unit elongation of the band that obtains of prior heat treatment process.
The high-strength and high ductility AZ91 magnesium alloy strip of the another kind of state that technology of the present invention obtains, β-Mg that it is inner
17Al
12Almost completely solid solution is in matrix, and unit elongation is 1.9 times of unit elongation of the band that obtains of prior heat treatment process.
Embodiment: supplied materials is that AZ91 magnesium alloy strip after the suitably distortion is through overaging, thickness is 1.0mm, and width is 3.5mm, after this AZ91 magnesium alloy deformation again through microstructure such as Fig. 2 of overaging, this magnesium ribbon is carried out electricity cause the highly malleablized processing, and compare with prior heat treatment.
With reference to Fig. 1, successive AZ91 magnesium alloy strip 7 is by decoiling equipment 5, wrap-up 6 control tension force are also pressed among the figure direction shown in the arrow and are transmitted with speed 4mpm under the drive of the roll 2 of rotation, only be Elastic Contact closely between roll 2 and the band, roll does not produce tangible viscous deformation to the magnesium alloy band, high energy pulse power supply 4 just, the negative pole electric imposing region 7 ' of the magnesium ribbon from first supporting roll 1 and roll 2 (distance at positive and negative electrode center is 400mm) access motion is respectively handled, the high energy pulse electric current produces joule heating effect and non-thermal effect at the electric imposing region 7 ' of magnesium alloy strip, and adjusting parameter carries out spheroidizing and the solution treatment that electricity causes highly malleablized to it respectively; Magnesium alloy strip after the processing directly enters wrap-up 6 and reels after the airborne cooling of room temperature.
Cause highly malleablized processing back β-Mg in order to obtain electricity
17Al
12The spherodized structure of phase is chosen pulse parameter and is: frequency 350Hz, pulse width 80 μ s, current density 600A/mm
2Aging state AZ91 magnesium alloy causes highly malleablized through electricity and handles back β-Mg
17Al
12The microstructure of nodularization is seen Fig. 3.
And cause highly malleablized processing back β-Mg in order to obtain electricity
17Al
12Solid solution structure, choose pulse parameter and be: frequency is 450Hz, pulse width 80 μ s, current density is 800A/mm
2Aging state AZ91 magnesium alloy causes highly malleablized through electricity and handles back β-Mg
17Al
12The microstructure of solid solution is seen Fig. 4.
For conveniently comparing, the prior heat treatment process condition is: Heating temperature is 410 ℃, and soaking time is 1 hour, and heat-up rate is 15 ℃/min.
Above-mentioned AZ91 magnesium alloy strip is handled forward and backward mechanical property experimental data such as table 1 through different process.
Table 1
Experiment finds, causes highly malleablized through electricity and handles AZ91 magnesium alloy strip inside, back by the original thick lath-shaped β-Mg that in flakes, unites
17Al
12Be phase-changed into equally distributed torulose β-Mg
17Al
12Particle or β-Mg
17Al
12Almost completely solid solution is in matrix, and that matrix grain is grown up is not obvious.And the β-Mg of the AZ91 magnesium alloy strip inside after the process prior heat treatment process
17Al
12Though solid solution is in matrix substantially mutually, matrix grain takes place to grow up unusually, and grain-size is very inhomogeneous.
The clear AZ91 magnesium alloy strip with the preceding aging state that is untreated of the Experiments of Machanics data sheet of table 1 is compared, and the unit elongation of the magnesium alloy strip that prior heat treatment process obtains is improved to some extent, but tensile strength obviously descends; And electricity causes the β-Mg that obtains after highly malleablized is handled
17Al
12The unit elongation of spherodized structure increases substantially, and the tensile strength fall is very little simultaneously; Electricity causes the β-Mg that obtains after highly malleablized is handled
17Al
12The unit elongation increase rate maximum of solid solution structure, but tensile strength descends a little; Therefore, causing highly malleablized through electricity, to handle the AZ91 magnesium alloy strip obtain be a kind of magnesium alloy materials of high-intensity high-tenacity.
Claims (10)
1, a kind of high-strength and high ductility AZ91 magnesium alloy strip electricity causes strength-toughening treatment process, it is characterized in that may further comprise the steps:
Decoiling equipment, wrap-up, roll and supporting roll tensioning by milling train are from the AZ91 magnesium alloy strip on the decoiling equipment, make the tight Elastic Contact of described magnesium alloy strip and roll, the rotation of driving roll, roll drive magnesium alloy strip by frictional force and transmit to the wrap-up direction with 0.2-100m/min speed;
Certain distance is provided with an Electical connector before roll, the high energy pulse electric current of high energy pulse power supply output is input to the electric imposing region of the magnesium alloy strip of the motion between roll and the Electical connector by this Electical connector and roll, the high energy pulse electric current produces joule heating effect and non-thermal effect at the electric imposing region of magnesium alloy strip, makes its inner microstructure by the original thick lath-shaped β-Mg that in flakes, unites
17Al
12Be phase-changed into equally distributed torulose β-Mg
17Al
12Particle or β-Mg
17Al
12Almost by complete solid solution in matrix; The natural air cooling at room temperature of magnesium alloy strip after the processing;
Wherein, the high energy pulse current parameters that is input to the electric imposing region of described magnesium alloy strip is: frequency 150-700Hz, pulse width 20-2300 μ s, the amplitude 400A/mm of current density
2-1000A/mm
2
2. high-strength and high ductility AZ91 magnesium alloy strip electricity as claimed in claim 1 causes strength-toughening treatment process, it is characterized in that: require to cause the highly malleablized processing requirements by electricity and obtain β-Mg
17Al
12During the spherodized structure of phase, the high energy pulse current parameters is: frequency 150-450Hz, pulse width 20-2300 μ s, the amplitude 400-800A/mm of current density
2
3. high-strength and high ductility AZ91 magnesium alloy strip electricity as claimed in claim 1 causes strength-toughening treatment process, it is characterized in that: require to cause the highly malleablized processing requirements by electricity and obtain β-Mg
17Al
12During solid solution structure, the high energy pulse current parameters is: frequency 400-700Hz, pulse width 20-2300 μ s, the amplitude 500-1000A/mm of current density
2
4. the high-strength and high ductility AZ91 magnesium alloy strip electricity as claim 1 or 2 or 3 causes strength-toughening treatment process, it is characterized in that: at magnesium alloy strip electric imposing region input high energy pulse electric current this area segments being carried out electricity, to cause the temperature that highly malleablized handles be 250 ℃-350 ℃.
5. the high-strength and high ductility AZ91 magnesium alloy strip electricity as claim 1 or 2 or 3 causes strength-toughening treatment process, and it is characterized in that: the electric imposing region length of described magnesium alloy strip is 10-800mm.
6. the high-strength and high ductility AZ91 magnesium alloy strip electricity as claim 1 or 2 or 3 causes strength-toughening treatment process, it is characterized in that: described Electical connector is two conducting metal wheels, distance between the mid point of two conducting metal wheel lines of centres and the mid point of the roll line of centres is 10-800mm, and described conducting metal is taken turns positive pole, the negative pole that is connected the high energy pulse power supply with roll respectively.
7, the high-strength and high ductility AZ91 magnesium alloy strip that adopts claim 1 or 2 described technologies to obtain, it is characterized in that: the heterogeneous microstructure of this band is equally distributed torulose β-Mg
17Al
12Particle, its unit elongation are 1.6 times of unit elongation of the band that obtains of prior heat treatment process.
8, the high-strength and high ductility AZ91 magnesium alloy strip that adopts claim 1 or 3 described technologies to obtain is characterized in that: the β-Mg in this band
17Al
12Almost completely solid solution is in matrix, and its unit elongation is 1.9 times of unit elongation of the band that obtains of prior heat treatment process.
9, a kind of magnesium alloy strip electricity of realization claim 1 or 2 or 3 described technologies causes the highly malleablized treatment system, comprises milling train, and this milling train has roll, decoiling equipment, wrap-up and corresponding insulation system; It is characterized in that:
Further comprise a high energy pulse power supply, be used to provide that the magnesium alloy strip electricity is caused the pulse width that highly malleablized handles is that 20-2300 μ s, frequency are the high energy pulse electric current of 150-700Hz;
In the both sides of frame topping roll first, second supporting roll is installed, the roll and first supporting roll as electrode all and between the frame insulate simultaneously, magnesium alloy strip from decoiling equipment is reeled tight through described first supporting roll, roll, second supporting roll to wrap-up, the tight Elastic Contact of magnesium alloy strip and roll, the roll of rotation drive magnesium alloy strip by frictional force and transmit to the wrap-up direction with certain speed; First supporting roll and roll are connected the positive and negative output terminal of described high energy pulse power supply respectively, the high energy pulse power supply is input to the high energy pulse electric current by this first supporting roll and roll the electric imposing region of the magnesium alloy strip of the motion between first supporting roll and the roll, the high energy pulse electric current produces joule heating effect and non-thermal effect at the electric imposing region of magnesium alloy strip, and this electric imposing region is carried out spheroidizing or the solution treatment that electricity causes highly malleablized.
10. magnesium alloy strip electricity as claimed in claim 9 causes the highly malleablized treatment system, it is characterized in that: described first supporting roll is two conducting metal wheels, and the distance between the mid point of two conducting metal wheel lines of centres and the mid point of the roll line of centres is 10-800mm.
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| CN102059250A (en) * | 2010-11-09 | 2011-05-18 | 燕山大学 | Electro-plastic two-roll mill of low-temperature liquid nitrogen cooling medium |
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