CN105220040A - A kind of Al-Zn-Mg alloy and preparation method thereof and application - Google Patents
A kind of Al-Zn-Mg alloy and preparation method thereof and application Download PDFInfo
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Abstract
The invention discloses a kind of Al-Zn-Mg alloy and preparation method thereof and application, this alloy comprises following component by mass percentage: Zn is 6.0 ~ 6.5%, Mg is 1.1 ~ 1.4%, Si≤0.10%, Fe≤0.10%, Cu≤0.12%, Mn≤0.15%, Cr≤0.15%, Ti≤0.10%, other total impurities < 0.15%, surplus is Al; Wherein the mass ratio of Zn and Mg is: Zn/Mg=4.3 ~ 5.9.Alloy of the present invention has higher-strength, lower quenching sensitive and formability, there is excellent anodic oxidation performance simultaneously, be applicable to the aluminium sheet and/or the aluminum pipe that manufacture portable electric appts shell or skeleton construction, be also applicable to the pipe rod type material manufacturing high strength and/or high brightness product.
Description
Technical field
The present invention relates to aluminum alloy materials and manufacture field thereof, refer in particular to a kind of Al-Zn-Mg alloy and preparation method thereof and application.
Background technology
Aluminium alloy has that light specific gravity, intensity are high, perfect heat-dissipating, easily processing, anodic oxidation decorative effect are excellent, and the various features such as recyclable recycling are widely used in the manufacture of all kinds of commodity.In recent years, consumer electronics market presents explosive growth, market emerges the electronic product of various structure and decoration, aluminium alloy structure wherein and decorate the symbol of high-end product especially.Along with continuous progress and the renewal of consumption idea, human consumer is more firm towards structure to the demand of portable electric appts (as notebook computer, panel computer, smart mobile phone, portable power source etc.), quality is lighter, thinner, brighter, the more wear-resisting future development of outward appearance.6063 and 6061 aluminium alloys have excellent anodic oxidation effect and medium tenacity mechanical property, are the excellent material manufacturing portable electric appts shell and frame structure.
Although 6063 and 6061 alloy anodic oxidation effect are excellent, intensity (hardness) is medium, and wear resistance is general, easy to wear in routine use, pressurized is yielding, and after using for some time, product appearance can sharply wear, and can not meet consumer demand under the new situation.As everyone knows, 7000 is that alloy belongs to high-strength alloy, and anodic oxidation effect is poor, and oxidized surface glossiness is low, and very easily produces linear speckle (fibrous crystal tissue profile).Therefore improve the over-all properties of aluminum alloy materials, meet wearing quality and the technical indicator such as ornamental all has larger economic worth and realistic meaning to portable electric appts and even whole consumer electronics market simultaneously.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art and shortcoming, provide a kind of Al-Zn-Mg alloy and preparation method thereof and application, this alloy has higher-strength, lower quenching sensitive and formability, has excellent anodic oxidation performance simultaneously.
For achieving the above object, technical scheme provided by the present invention is as follows:
A kind of Al-Zn-Mg alloy, this alloy comprises following component by mass percentage: Zn is 6.0 ~ 6.5%, Mg is 1.1 ~ 1.4%, Si≤0.10%, Fe≤0.10%, Cu≤0.12%, Mn≤0.15%, Cr≤0.15%, Ti≤0.10%, other total impurities < 0.15%, surplus is Al; Wherein the mass ratio of Zn and Mg is: Zn/Mg=4.3 ~ 5.9.
Originally " Al-Zn-Mg " alloying constituent is when designing, as the term suggests effective ingredient is: Al-Zn-Mg.Improve alloy strength basis takes into full account heat processing and forming time workpiece generate the recrystallized structure being conducive to anodic oxidation effect.In Al-Zn-Mg alloy, Zn and Mg element is the main alloy element forming strengthening phase, can form η (MgZn when both exist simultaneously
2) and T (A1
2mg
2zn
3) etc. ageing strengthening phase, alloy is along with the increase of Zn, Mg content, and its tensile strength increases thereupon.This alloy is mass ratio design (preferred Zn/Mg=5.0 ~ 5.5) of 4.3 ~ 5.9 by Zn/Mg, and object makes Zn and Mg make full use of, and forms MgZn
2(η) precipitation strength phase.η precipitated phase, because of solid solubility temperature low (about 420 DEG C), so solution heat treatment is simple, can carry out solution heat treatment on line.And the quench sensitivity of this alloy is low, can be undertaken quenching by slower rate of cooling (as air-cooled, water smoke cooling etc.) and not sacrifice mechanical property, so can ensure dimensional precision and the mechanical property of the finished product.
Cu can improve the dispersity of precipitated phase in Al-Zn-Mg alloy, is conducive to putting forward heavy alloyed intensity and anodized surface glossiness, but makes load needed for alloy hot-work strengthen simultaneously, increases the quench sensitivity of alloy, is unfavorable for the use of this alloy.The content of Cu controls below 0.12% by the present invention, makes alloy have better over-all properties, but does not increase the load of processing, takes into account operation and the control of production.
Mn and Cr undergoes phase transition reaction with matrix alloy aluminium when Homogenization Treatments in the middle of alloy matrix aluminum: Al+Mn → MnAl
6with Al+Cr → CrAl
7.MnAl
6and CrAl
7be on good terms and stop the recrystallization process of aluminium alloy, improve recrystallization temperature, the crystal grain of refinement recrystallized structure, make alloy recrystallization difficulty, but quenching sensitive increases, make thermal treatment difficulty.The interpolation of Mn, Cr can make alloy high-temp intensity improve, and is unfavorable for heat processing and forming.Mn, Cr mass percent of the present invention all controls below 0.15%, mainly makes the production rate of this alloy in hot procedure accelerate and is more prone to produce the crystalline-granular texture of recrystallize, being beneficial to improve alloy anode oxidation effectiveness.And the control of amount makes the thermal treatment of this alloy become simple.The Ti of trace, can cast crystal grain by refining alloy, be conducive to improving alloy mechanical property.But more Ti makes alloy high-temp intensity increase, thermoforming performance reduces, and is unfavorable for the present invention, so the amount of Ti needs strict control.
Fe and Si is inevitable detrimental impurity in alloy, Fe can reduce the mechanical property of aluminium alloy, improves alloy recrystallization temperature, generates recrystallized structure when being unfavorable for hot-work, form Micro-v oid reduction oxidized surface glossiness containing Fe phase is easy at oxidized surface simultaneously, reduce alloy anode oxidation effectiveness.Si can reduce intensity of aluminum alloy.When Fe, Si exist, except FeAl simultaneously
3with outside Si phase, mainly with Al that is insoluble or indissoluble
7cu
2fe, Mg
2the form of the brittlement phase such as Si, AlFeMnSi and cocrystalization compound exists, and increases the hot cracking tendency of alloy.Therefore the present invention need reduce Fe, Si content as far as possible.
The preparation method of above-mentioned Al-Zn-Mg alloy, comprises the following steps:
1) aluminium, zinc, magnesium are adopted aluminium ingot, zinc ingot metal and magnesium ingot, get the raw materials ready according to the ratio of aforesaid Al-Zn-Mg alloy; Wherein aluminium ingot preferably selects Fe mass percentage to be: the aluminium ingot of Fe≤0.08%, the object that reaches Fe≤0.10% in final alloy ratio with more convenient (main consider in the process of processing because the membership that adds of the loss of aluminium or other ferrous materials makes to rise containing Fe ratio in alloy);
Because aluminium ingot, zinc ingot metal and magnesium ingot in reality are inevitably with Si, Fe, Cu, Mn, Cr, Ti and other impurity, so Si, Fe, Cu, Mn, Cr, Ti do not need to get the raw materials ready especially, but carry out upper limit control as impurity; And in actual production, the pre-a little more some surplus of aluminium ingot, zinc ingot metal and magnesium ingot also can be selected with the deal of the impurity that liquidates.
2) aluminium ingot is heated to 730-760 DEG C to melt, after aluminium ingot melts completely, obtains molten aluminium, then the 1st is added to molten aluminium) the step zinc ingot metal of getting the raw materials ready and magnesium ingot, carry out alloying to molten aluminium;
3) in molten aluminium, add refining agent in the ratio of 2kg/ ton molten aluminium, carry out refining, refining temperature 730-750 DEG C, refining time 30 ~ 50 minutes, while refining, in molten aluminium, pass into high-purity argon gas carry out stirring, being vented, then skim;
4) process in standing 30 ~ 50 minutes is carried out to the molten aluminium obtained;
5) cast by molten aluminium, casting temp controls at 680 ~ 700 DEG C, and casting obtains alloy circle ingot casting;
6) by the alloy of acquisition circle ingot casting heat after 450 ± 5 DEG C be incubated 4 hours, then be warming up to 510 ± 5 DEG C insulation 10 hours, be then chilled to room temperature by force with water smoke, finally obtain required Al-Zn-Mg alloy.
The 3rd) and the 4th) also comprise step A between step: sampling analysis chemical composition, if alloying constituent is not in scope according to claim 1, then by trimming, alloying constituent is controlled in scope according to claim 1, for the loss of corresponding production process.
The 4th) and the 5th) also comprise step B between step: deep purifying is carried out to molten aluminium.
Describedly deep purifying is carried out to molten aluminium refer to and carry out deep purifying by box degasifying device and double-stage filtering system, also can adopt other treating plants and program in addition.
In step 2) described in aluminium ingot is heated to 730-760 DEG C and carries out fusing and refer to, aluminium ingot is loaded in heat accumulating type flame reflective energy-saving stove and melts; In step 5) middle employing semicontinuous water cooling casting method casting acquisition alloy circle ingot casting; In step 6) in, the alloy of acquisition circle ingot casting is heated in homogenizing heat treatment furnace.
Above-mentioned Al-Zn-Mg alloy for the manufacture of the aluminium sheet of portable electric appts shell or skeleton construction and/or aluminum pipe, or for the manufacture of the pipe rod type material of high strength and/or high brightness product.
Compared with prior art, tool has the following advantages and beneficial effect in the present invention:
1, alloy of the present invention tensile strength sigma under T6 state
b>=400Mpa, yield strength σ
0.2>=360Mpa, elongation after fracture δ>=14%.Compared with 7003-T6 national standard, this alloy strength exceeds 14%, and yield strength exceeds 25%, and elongation after fracture exceeds 75%.
2, this alloy also has splendid anodic oxidation performance while possessing higher-strength, under T6 state, anodic oxidation effect and 6063 alloy phases are worked as, oxidized surface glossiness can reach more than 650GS (gloss value), exceed more than 30% than 6063 alloys under equal conditions, solve the technical barrier that 7000 are high strength alloy anodic oxidation poor performance well.
3, consider that this alloy has higher-strength, possesses excellent anodic oxidation performance simultaneously, as the application of the best, alloy of the present invention can as manufacture to higher-strength, decorative surface or the industrial aluminum alloy materials both having demand, as portable electric appts shell or skeleton construction material, car bumper material etc.
Accompanying drawing explanation
Fig. 1 is preparation technology's schema of Al-Zn-Mg alloy of the present invention.
Embodiment
Below in conjunction with multiple specific embodiment, the invention will be further described.
Embodiment 1
Starting material are as follows:
Aluminium ingot: adopt the trade mark to be the aluminium ingot of Al99.7, in aluminium ingot, the mass percent of Al is the mass percent of more than 99.70%, Fe is less than 0.08%, conformance with standard GB/T1196-2008 " remelting aluminium ingot ";
Zinc ingot metal: adopt the trade mark to be the zinc ingot metal of Zn99.95, in zinc ingot metal, the mass percent of Zn is more than 99.95%, conformance with standard GB/T470-2008 " zinc ingot metal ";
Magnesium ingot: adopt the trade mark to be the magnesium ingot of Mg9990, in magnesium ingot, the mass percent of Mg is more than 99.9%, conformance with standard GB/T3499-2003 " primary magnesium ingot ";
Refining agent: adopt the trade mark to be the granular refining agent of PROMAGRI, conformance with standard YS/T491-2005 " distortion Al and Alalloy flux ";
Refinery gas: adopt high-purity argon gas, purity and percent by volume are >=99.999%;
Melting online treatment gas: adopt high-purity argon gas, purity and percent by volume are >=99.999%.
Put in order by above-mentioned raw materials in heat accumulating type flame reflective energy-saving stove and carry out intensification smelting, fuel adopts Sweet natural gas, and as shown in Figure 1, concrete steps are as follows in technical process:
1) according to portable electric appts or middle frame structure to the requirement of material property: tensile strength sigma
b>=400Mpa, yield strength σ
0.2>=360Mpa, elongation after fracture δ>=12%, anodized surface glossiness>=400GS.During design of alloy, requiring to improve outside alloy strength, when also taking into full account heat processing and forming, workpiece generates the recrystallized structure being conducive to anodic oxidation effect, finally determine each Ingredient percent, in table 1, the scope of each moiety is: Zn6.0 ~ 6.5%, Mg1.1 ~ 1.4%, Si≤0.10%, Fe≤0.10%, Cu≤0.12%, Mn≤0.15%, Cr≤0.15%, Ti≤0.10%, other total impurities < 0.15%, surplus is Al, wherein the mass ratio of Zn and Mg: Zn/Mg=4.3 ~ 5.9.
2) starting material prepare: aluminium, zinc, magnesium adopt aluminium ingot, zinc ingot metal and magnesium ingot, and wherein each composition is Zn6.45%, Mg1.36%, Fe≤0.10% by mass percentage, Mn≤0.15%, Cr≤0.15%, Cu≤0.12%, Ti≤0.10%, Si≤0.10%, surplus is Al; The content of Zn, Mg is than being Zn/Mg=4.7.
3) shove charge: the aluminium ingot in above-mentioned raw materials is loaded heat accumulating type flame reflective energy-saving stove.
4) to heat fusing: in-furnace temperature is controlled at 760 DEG C, make aluminium ingot be melted into molten aluminium completely.
5) alloying: add above-mentioned zinc ingot metal, magnesium ingot and other components in molten aluminium, and stirring makes it melt, carry out preliminary alloying to melt, wherein the mass ratio of aluminium ingot and zinc ingot metal controls to be 14.5: 1, and the add-on of magnesium ingot is 2.2% of quality of ingot aluminum.Here the ratio of aluminium ingot and zinc ingot metal, magnesium ingot are all larger than actual proportioning with the ratio of aluminium ingot, mainly consider loss in actual production and facilitate the fine setting of follow-up process.
6) refining: in step 5) add refining agent in the molten aluminium that obtains, consumption is 2kg/ ton molten aluminium, refining temperature is 750 DEG C, refining time is 30 minutes, if needed, a certain amount of zinc ingot metal is added or the alloying constituent of magnesium ingot to molten aluminium is finely tuned in refining process, to make up production loss, while refining, in molten aluminium, pass into high-purity argon gas by furnace bottom gas permeable brick carry out stirring, being vented, then skim, argon pressure controls at 0.05 ~ 0.1MPa, and flow control is at 12L/ minute.
7) alloy component analysis: to step 6) melt that obtains after refining carries out alloying element analysis, if alloying constituent is not in step 2) described in scope in, then by trimming, alloying constituent is controlled in step 2) described in scope in.This step is preferred steps.
8) process is left standstill: molten aluminium is left standstill 30 minutes.
9) online box degasification: adopt external box of furnace formula degasifying device to carry out dehydrogenation, molten aluminium hydrogen content controls below 0.12ml/100g.Al aluminium.
10) online double-stage filtering: adopt double-stage filtering system, specifically adopts two piece of 70 order foamed ceramic panel to filter.
11) cast: adopt semicontinuous water cooling casting method to cast and obtain alloy circle ingot casting, casting temp controls at 700 DEG C.
12) Homogenization Treatments: adopt two-step homogenization technique, 450 ± 5 DEG C of insulations after 4 hours, is warming up to 510 ± 5 DEG C of insulations 10 hours, is then quickly cooled to room temperature with water smoke, finally obtains required Al-Zn-Mg alloy, be specially aluminium alloy round cast ingot.
Embodiment 2
When getting the raw materials ready, aluminium, zinc, magnesium adopt aluminium ingot, zinc ingot metal and magnesium ingot, and wherein each composition is Zn6.42%, Mg1.16%, Fe≤0.10%, Mn≤0.15%, Cr≤0.15%, Cu≤0.12%, Ti≤0.10%, Si≤0.10% by mass percentage, and surplus is Al; Wherein, the content of Zn, Mg is than being Zn/Mg=5.5.Aluminium alloy round cast ingot is obtained according to the explained hereafter identical with embodiment 1, wherein, the temperature of heat accumulating type flame reflective energy-saving stove controls at 730 DEG C, the mass ratio of aluminium ingot and zinc ingot metal controls to be 16: 1, the add-on of magnesium ingot is 2.0% of quality of ingot aluminum, and refining temperature is 730 DEG C, and refining time is 50 minutes, molten aluminium time of repose is 50 minutes, and casting temp controls at 680 DEG C.
Embodiment 3
When getting the raw materials ready, aluminium, zinc, magnesium adopt aluminium ingot, zinc ingot metal and magnesium ingot, and wherein each composition is Zn6.43%, Mg1.26%, Fe≤0.10%, Mn≤0.15%, Cr≤0.15%, Cu≤0.12%, Ti≤0.10%, Si≤0.10% by mass percentage, and surplus is Al; Wherein, the content of Zn, Mg is than being Zn/Mg=5.1.Aluminium alloy round cast ingot is obtained according to the explained hereafter identical with embodiment 1.
Embodiment 4
When getting the raw materials ready, aluminium, zinc, magnesium adopt aluminium ingot, zinc ingot metal and magnesium ingot, and wherein each composition is Zn6.31%, Mg1.17%, Fe≤0.10% by mass percentage, Mn≤0.15%, Cr≤0.15%, Cu≤0.12%, Ti≤0.10%, Si≤0.10%, surplus is that Al gets the raw materials ready; Wherein, the content of Zn, Mg is than being Zn/Mg=5.4.Aluminium alloy round cast ingot is obtained according to the explained hereafter identical with embodiment 1.
Embodiment 5
When getting the raw materials ready, aluminium, zinc, magnesium adopt aluminium ingot, zinc ingot metal and magnesium ingot, and wherein each composition is Zn6.34%, Mg1.29%, Fe≤0.10% by mass percentage, Mn≤0.15%, Cr≤0.15%, Cu≤0.12%, Ti≤0.10%, Si≤0.10%, surplus is that Al gets the raw materials ready; Wherein, the content of Zn, Mg is than being Zn/Mg=4.9.Aluminium alloy round cast ingot is obtained according to the explained hereafter identical with embodiment 1.
Embodiment 6
When getting the raw materials ready, aluminium, zinc, magnesium adopt aluminium ingot, zinc ingot metal and magnesium ingot, and wherein each composition is Zn6.35%, Mg1.37%, Fe≤0.10% by mass percentage, Mn≤0.15%, Cr≤0.15%, Cu≤0.12%, Ti≤0.10%, Si≤0.10%, surplus is that Al gets the raw materials ready; Wherein, the content of Zn, Mg is than being Zn/Mg=4.6.Aluminium alloy round cast ingot is obtained according to the explained hereafter identical with embodiment 1.
Embodiment 7
When getting the raw materials ready, aluminium, zinc, magnesium adopt aluminium ingot, zinc ingot metal and magnesium ingot, and wherein each composition is Zn6.1%, Mg1.34%, Fe≤0.10% by mass percentage, Mn≤0.15%, Cr≤0.15%, Cu≤0.12%, Ti≤0.10%, Si≤0.10%, surplus is that Al gets the raw materials ready; Wherein, the content of Zn, Mg is than being Zn/Mg=4.6.Aluminium alloy round cast ingot is obtained according to the explained hereafter identical with embodiment 1.
Embodiment 8
When getting the raw materials ready, aluminium, zinc, magnesium adopt aluminium ingot, zinc ingot metal and magnesium ingot, and wherein each composition is Zn6.17%, Mg1.14%, Fe≤0.10% by mass percentage, Mn≤0.15%, Cr≤0.15%, Cu≤0.12%, Ti≤0.10%, Si≤0.10%, surplus is that Al gets the raw materials ready; Wherein, the content of Zn, Mg is than being Zn/Mg=5.4.Aluminium alloy round cast ingot is obtained according to the explained hereafter identical with embodiment 1.
Embodiment 9
When getting the raw materials ready, aluminium, zinc, magnesium adopt aluminium ingot, zinc ingot metal and magnesium ingot, and wherein each composition is Zn6.0%, Mg1.39%, Fe≤0.10%, Mn≤0.15%, Cr≤0.15%, Cu≤0.12%, Ti≤0.10%, Si≤0.10% by mass percentage, and surplus is Al; Wherein, the content of Zn, Mg is than being Zn/Mg=4.3.Aluminium alloy round cast ingot is obtained according to the explained hereafter step identical with embodiment 1, wherein, manufacturing parameter is adjusted to: the temperature of heat accumulating type flame reflective energy-saving stove controls at 750 DEG C, the mass ratio of aluminium ingot and zinc ingot metal controls to be 16: 1, the add-on of magnesium ingot is 2.0% of quality of ingot aluminum, and refining temperature is 740 DEG C, and refining time is 40 minutes, molten aluminium time of repose is 45 minutes, and casting temp controls at 685 DEG C.
Embodiment 10
When getting the raw materials ready, aluminium, zinc, magnesium adopt aluminium ingot, zinc ingot metal and magnesium ingot, and wherein each composition is Zn6.5%, Mg1.10%, Fe≤0.10%, Mn≤0.15%, Cr≤0.15%, Cu≤0.12%, Ti≤0.10%, Si≤0.10% by mass percentage, and surplus is Al; Wherein, the content of Zn, Mg is than being Zn/Mg=5.9.Aluminium alloy round cast ingot is obtained according to the explained hereafter step identical with embodiment 1, wherein, manufacturing parameter is adjusted to: the temperature of heat accumulating type flame reflective energy-saving stove controls at 745 DEG C, the mass ratio of aluminium ingot and zinc ingot metal controls to be 16: 1, the add-on of magnesium ingot is 2.0% of quality of ingot aluminum, and refining temperature is 735 DEG C, and refining time is 38 minutes, molten aluminium time of repose is 35 minutes, and casting temp controls at 690 DEG C.
Embodiment 11
When getting the raw materials ready, aluminium, zinc, magnesium adopt aluminium ingot, zinc ingot metal and magnesium ingot, and wherein each composition is Zn6.5%, Mg1.3%, Fe≤0.10%, Mn≤0.15%, Cr≤0.15%, Cu≤0.12%, Ti≤0.10%, Si≤0.10% by mass percentage, and surplus is Al; Wherein, the content of Zn, Mg is than being Zn/Mg=5.0.Produce according to the processing step identical with embodiment 1 and obtain aluminium alloy round cast ingot, wherein, manufacturing parameter adopts: the temperature of heat accumulating type flame reflective energy-saving stove controls at 755 DEG C, the mass ratio of aluminium ingot and zinc ingot metal controls to be 16: 1, the add-on of magnesium ingot is 2.0% of quality of ingot aluminum, and refining temperature is 740 DEG C, and refining time is 40 minutes, molten aluminium time of repose is 35 minutes, and casting temp controls at 685 DEG C.
Embodiment 12
When getting the raw materials ready, aluminium, zinc, magnesium adopt aluminium ingot, zinc ingot metal and magnesium ingot, and wherein each composition is Zn6.16%, Mg1.4%, Fe≤0.10%, Mn≤0.15%, Cr≤0.15%, Cu≤0.12%, Ti≤0.10%, Si≤0.10% by mass percentage, and surplus is Al; Wherein, the content of Zn, Mg is than being Zn/Mg=4.4.Aluminium alloy round cast ingot is obtained according to the explained hereafter step identical with embodiment 1, wherein, manufacturing parameter adopts: the temperature of heat accumulating type flame reflective energy-saving stove controls at 740 DEG C, the mass ratio of aluminium ingot and zinc ingot metal controls to be 16: 1, the add-on of magnesium ingot is 2.0% of quality of ingot aluminum, and refining temperature is 730 DEG C, and refining time is 45 minutes, molten aluminium time of repose is 45 minutes, and casting temp controls at 700 DEG C.
Result of implementation
Aluminium alloy round cast ingot sawing obtained for embodiment 1 ~ 8 is become short material, with technique: extrusion temperature 480 DEG C, extrusion ratio 42, extrusion speed (master cylinder rate of advance) 8.0mm/s, press quenching rate of cooling is 40 DEG C/s, and aging temp is 150 DEG C, aging time 21 hours; Making sectional dimension is: the extrusion plate of wide 90mm × thick 9mm, and as-heat-treated condition is T6.According to GB/T228.1-2010 " metal material stretching test part 1: room temperature test method ", Mechanics Performance Testing is carried out to sheet material, test result is in table 2, standard GB/T/T6892-2006 " general industry Al and Alalloy extruded section " gives the mechanical property standard of comparative alloy 7003-T6, in table 2.Contrast with 7003-T6 national standard, this alloy strength exceeds 14% than it, and yield strength exceeds 25%, and elongation after fracture exceeds 75%, and comprehensive mechanical property is apparently higher than the national standard of 7003 alloys.
The aluminum alloy plate materials of above-mentioned obtained T6 state is made the sample of wide 90mm × thick 9mm × long 150mm by sawing, mechanical polishing, degreasing, alkaline etching, chemical rightenning, anodic oxidation true qualities are carried out successively to sample, then carry out oxidized surface glossiness test (60 ° of angle direction tests) according to GB/T20503-2006 " mensuration 20 ° of Al and Alalloy anodic oxidation anode oxide film specular reflectance and mirror surface luster, 45 °, 60 °, 85 ° angle directions ", test result is in table 3.Under equal conditions, compare the oxidation effectiveness of 6063-T6,7003-T6 and alloy T6 state of the present invention, alloy gloss value of the present invention is the highest, anodic oxidation effect and 6063 suitable.
The each constituent mass per-cent of table 1 aluminium alloy
Table 2 mechanical experimental results
Table 3 anodic oxidation effect test result
The examples of implementation of the above are only the preferred embodiment of the present invention, not limit practical range of the present invention with this, therefore the change that all shapes according to the present invention, principle are done, all should be encompassed in protection scope of the present invention.
Claims (9)
1. an Al-Zn-Mg alloy, it is characterized in that: this alloy comprises following component by mass percentage: Zn is 6.0 ~ 6.5%, Mg is 1.1 ~ 1.4%, Si≤0.10%, Fe≤0.10%, Cu≤0.12%, Mn≤0.15%, Cr≤0.15%, Ti≤0.10%, other total impurities < 0.15%, surplus is Al; Wherein the mass ratio of Zn and Mg is: Zn/Mg=4.3 ~ 5.9.
2. Al-Zn-Mg alloy according to claim 1, is characterized in that: the mass ratio of described Zn and Mg is: Zn/Mg=5.0 ~ 5.5.
3. a preparation method for Al-Zn-Mg alloy described in claim 1, is characterized in that: comprise the following steps:
1) get the raw materials ready according to mass percent according to claim 1, wherein aluminium, zinc, magnesium adopt aluminium ingot, zinc ingot metal and magnesium ingot;
2) aluminium ingot is heated to 730-760 DEG C to melt, after aluminium ingot melts completely, obtains molten aluminium, then the 1st is added to molten aluminium) zinc ingot metal, magnesium ingot that step is got the raw materials ready, carry out alloying to molten aluminium;
3) in molten aluminium, add refining agent in the ratio of 2kg/ ton molten aluminium, carry out refining, refining temperature 730-750 DEG C, refining time 30 ~ 50 minutes, while refining, in molten aluminium, pass into high-purity argon gas carry out stirring, being vented, then skim;
4) process in standing 30 ~ 50 minutes is carried out to the molten aluminium obtained;
5) cast by molten aluminium, casting temp controls at 680 ~ 700 DEG C, and casting obtains alloy circle ingot casting;
6) by the alloy of acquisition circle ingot casting heat after 450 ± 5 DEG C be incubated 4 hours, then be warming up to 510 ± 5 DEG C insulation 10 hours, be then chilled to room temperature by force with water smoke, finally obtain required Al-Zn-Mg alloy.
4. the preparation method of a kind of Al-Zn-Mg alloy according to claim 3, it is characterized in that: the 3rd) and the 4th) also comprise step A between step: sampling analysis chemical composition, if alloying constituent is not in scope according to claim 1, then by trimming, alloying constituent is controlled in scope according to claim 1.
5. the preparation method of a kind of Al-Zn-Mg alloy according to claim 3, is characterized in that, the 4th) and the 5th) also comprise step B between step: deep purifying is carried out to molten aluminium.
6. the preparation method of a kind of Al-Zn-Mg alloy according to claim 5, is characterized in that: describedly carry out deep purifying to molten aluminium and refer to and carry out deep purifying by box degasifying device and double-stage filtering system.
7. the preparation method of a kind of Al-Zn-Mg alloy according to claim 3, is characterized in that: in step 2) described in aluminium ingot is heated to 730-760 DEG C and carries out fusing and refer to, aluminium ingot is loaded in heat accumulating type flame reflective energy-saving stove and melts; In step 5) middle employing semicontinuous water cooling casting method casting acquisition alloy circle ingot casting; In step 6) in, the alloy of acquisition circle ingot casting is heated in homogenizing heat treatment furnace.
8. an application for Al-Zn-Mg alloy described in claim 1, is characterized in that: for the manufacture of aluminium sheet and/or the aluminum pipe of portable electric appts shell or skeleton construction.
9. an application for Al-Zn-Mg alloy described in claim 1, is characterized in that: for the manufacture of the pipe rod type material of high strength and/or high brightness product.
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| CN106244875B (en) * | 2016-09-08 | 2018-12-11 | 四川福蓉科技股份公司 | 7 line aluminium alloys of one kind and preparation method thereof |
| CN106834834B (en) * | 2017-02-27 | 2018-10-16 | 东莞市铝美铝型材有限公司 | A kind of use for electronic products high-strength aluminum alloy and preparation method thereof |
| CN106834834A (en) * | 2017-02-27 | 2017-06-13 | 东莞市铝美铝型材有限公司 | A kind of use for electronic products high-strength aluminum alloy and preparation method thereof |
| CN106939387A (en) * | 2017-02-27 | 2017-07-11 | 广东兴发铝业有限公司 | A kind of car insurance bar aluminium alloy and preparation method thereof |
| CN107619976A (en) * | 2017-08-09 | 2018-01-23 | 中车青岛四方机车车辆股份有限公司 | A kind of Al Zn Mg alloys and preparation method thereof |
| CN107447142A (en) * | 2017-08-10 | 2017-12-08 | 广东和胜工业铝材股份有限公司 | High tough high Alcoa of a kind of automobile using and preparation method thereof |
| CN107447142B (en) * | 2017-08-10 | 2019-01-11 | 广东和胜工业铝材股份有限公司 | Tough high Alcoa of a kind of automobile height and preparation method thereof |
| CN107675047A (en) * | 2017-10-12 | 2018-02-09 | 广东和胜工业铝材股份有限公司 | Al Mg Si Cu alloys and preparation method thereof |
| CN107675047B (en) * | 2017-10-12 | 2019-07-02 | 广东和胜工业铝材股份有限公司 | Al-Mg-Si-Cu alloy and preparation method thereof |
| CN109295363A (en) * | 2018-12-14 | 2019-02-01 | 四川福蓉科技股份公司 | 7 line aluminium alloys of one kind and preparation method thereof |
| CN110699575A (en) * | 2019-09-27 | 2020-01-17 | 黄山市龙跃铜业有限公司 | High-strength and high-toughness aluminum alloy and preparation method thereof |
| CN111826561A (en) * | 2019-12-31 | 2020-10-27 | 广东和胜工业铝材股份有限公司 | Al-Zn-Mg-Cu alloy and preparation process thereof |
| WO2023142730A1 (en) * | 2022-01-30 | 2023-08-03 | 荣耀终端有限公司 | Middle frame, middle frame machining method and electronic device |
| CN116732395A (en) * | 2023-06-19 | 2023-09-12 | 西南铝业（集团）有限责任公司 | Al-Zn-Cu-Mg aluminum alloy bar and preparation method thereof |
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