CN1834277A - High Zn content, superstrength and supertoughness, high destroy limit type aluminium alloy material and prepn. method - Google Patents
High Zn content, superstrength and supertoughness, high destroy limit type aluminium alloy material and prepn. method Download PDFInfo
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- CN1834277A CN1834277A CNA2005101092707A CN200510109270A CN1834277A CN 1834277 A CN1834277 A CN 1834277A CN A2005101092707 A CNA2005101092707 A CN A2005101092707A CN 200510109270 A CN200510109270 A CN 200510109270A CN 1834277 A CN1834277 A CN 1834277A
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Abstract
This invention discloses a high strength, high toughness and high damage-tolerance aluminum alloy with high zinc-content, which is composed of Zn 9-10 wt.%, Mg 2.0-2.5 wt.%, Cu 1.2-1.7 wt.%, Zr 0.2-0.5 wt.%, Fe less than 0.05 wt.%, Si less than 0.05 wt.% and Al as balance. The aluminum alloy is manufactured by: mixing the raw materials, smelting, casting into alloy ingots, melting the ingots at 780-800 deg.C, carrying out fast-solidification injection molding with inert gas as an atomization gas under 0.5-1.0 MPa. The aluminum alloy has such advantages as uniform component distribution, uniform microstructure and no segregation. After reasonable thermal treatment, the aluminum alloy has an ultimate tensile strength high than 750 MPa and an elongation rate of 8-11%. The fracture toughness and fatigue strength of the aluminum alloy are better than those of 7050T74 material. The aluminum alloy can be used as key structures in aerospace and aviation industry, nuclear industry and military industry.
Description
Technical field
Originally relate to invention and a kind of aluminium alloy, particularly intensity more than 750MPa, have high-strength and high ductility high-damage tolerant alloy material of high fracture toughness property and fatigue property and preparation method thereof simultaneously.
Background technology
Aluminium alloy has low, the easy processing of proportion, low cost and other advantages as most typical light material in the metallic substance, is a kind of dual-use material of key always.Aluminium alloy is to be only second to iron and steel, the structural metallic materials that consumption is second largest, and the high-strength and high ductility eternal developing direction that is aluminium alloy, if the aluminium alloy ultimate tensile strength reaches 800MPa, its specific tenacity value will reach 300MPacm
3/ g is (for specific tenacity value 300MPa.cm
3/ g means that Require for Steel Material intensity reaches 2350MPa, and titanium alloy reaches 1450MPa), will become one of the highest structural metallic materials of present specific tenacity.
7000 is that (AlZnMgCu system) high strength alumin ium alloy is to be background development and the class aluminum alloy materials that grows up with the aerospace material, being widely used in the manufacturing of high-strength structure part etc. in various airframes, wingbar, cabin wallboard, nuclear industry and the rocket for a long time, is indispensable important materials in the aerospace industry of countries in the world.
For a long time, adopting traditional ingot metallurgy process exploitation and producing 7000 is in the strong alloy process of superelevation, it is found that along with main alloying element (Zn, Mg, Cu) total content increases, the raising of alloying level the ageing strengthening phase volume fraction increases to some extent in the final alloy, the performance of material can obtain lifting to a certain degree.But when main alloying element (Zn, Mg, Cu) total content delimits above one, because the restriction (generally being no more than 10K/s) of traditional blank-making technology solidification cooling, can form a large amount of thick precipitated phases in the alloy, these precipitated phase is difficult to make its Hui Rong in matrix by follow-up solution treatment, not only can further not improve the volume fraction of ageing strengthening phase in the final alloy, can worsen every performance of material on the contrary.Therefore, when adopting traditional ingot metallurgy and deformation processing technique to produce 7000 line aluminium alloys, the highest 12～13wt% that is no more than of main alloying element (Zn, Mg, Cu) total content in the general control alloy, above-mentioned reason has directly caused the ultimate tensile strength (σ of this class alloy of production in the world
b) pace up and down about 500～600MPa for a long time.
Enter after the 1980s, along with rapid solidification/powder metallurgy (RS/PM, Rapidlysolidified technology/Powder metallurgy) development of technology makes that Development of New Generation rapid solidification 7XXX is that ultra-high-strength aluminum alloy becomes possibility.After adopting fast solidification technology, even break through the composition design that the boundary of main alloying element total content 12～13wt% is carried out novel alloy, because the setting rate in the base process is obviously accelerated (can reach 10
3～10
6More than the K/s), the solid solubility of base process interalloy element increases, generally can not occur a large amount of thick precipitated phases, obviously refinement of tissue simultaneously, therefore help forming in final alloy more the ageing strengthening phase and the fine grained texture of high-volume fractional, the final performance of material can increase substantially.The preparation that flash set technology is used for high strength alumin ium alloy can make the performance of material be highly improved, and ultimate tensile strength can rise to more than the 800MPa from 600MPa, makes the performance of material reach a brand-new level.
With the U.S., Germany has just utilized spray forming technology for the industrially developed country of representative in the mid-90 in 20th century, successfully strong 7000 line aluminium alloys of 800MPa intensity level rapid solidification superelevation have been prepared in exploitation---and the main alloying element total content of this alloy will be higher than various 7000 line aluminium alloys that traditional technology is produced far away, and can produce in batches, its squeeze wood main performance index can reach: yield strength is more than 750MPa, ultimate tensile strength is more than 800MPa, unit elongation 4～6%, anti-fracture toughness property is not less than 21～22MPa*m1/2, Young's modulus is not less than 72GPa, and it mainly uses the various high-strength light component that comprise in guided missile and the rocket, the bullet train hook, key components and parts in the racing car etc.
But in the strong 7000 line aluminium alloy evolutions of above-mentioned rapid solidification superelevation, also exist significantly not enough, show a little less than the optimization design work relative thin of alloying constituent, at present on the low side, fracture toughness property value of the alloy unit elongation of producing and anti-fatigue performance are poor, be difficult to satisfy high damage tolerance, high reliability, high security, the long-life requirement that proposes in a large amount of aerospace Equipment Development of new generation, the range of application of alloy is restricted.
Present patent application unit has applied for ultrahigh-intensity high-toughness aluminum alloy materials of (10～11) weight %Zn content and preparation method thereof in earlier stage, and (application number is: 03119605.5, the applying date is on March 14th, 2003) this material has obtained practical application.But as the above, in the occasion of some high-fracture toughness that require emphasis, high fatigue property, high damage tolerance performance (such as, aerospace field), the application of this type of material has been subjected to very big restriction.Just be based on above understanding and demand, present patent application unit has carried out research pointedly, and has obtained good effect, therefore applies for this patent.
In addition, industrially developed country still takes the form of KnowHow to be protected to a complete set of technology that reaction-injection moulding prepares the strong 7000 line aluminium alloy materials of superelevation at present at present, does not form any patent so far yet.
Summary of the invention
The purpose of this invention is to provide the superstrength and supertoughness, high destroy limit type aluminium alloy material of a kind of ultimate tensile strength more than 750MPa, this novel alloy improves more than 30% than traditional high-strength/tenacity aluminum alloy intensity.
Another object of the present invention provides a kind of preparation method who is applicable to the superstrength and supertoughness, high destroy limit type aluminium alloy material of manufacturing limit tensile strength more than 750MPa.
For achieving the above object, the present invention takes following technical scheme:
The superstrength and supertoughness, high destroy limit type aluminium alloy material of ultimate tensile strength of the present invention more than 750MPa by weight percentage, alloying constituent is Zn 9～10wt%, Mg 2.0～2.5wt%, Cu 1.2～1.7wt%, Zr 0.2～0.5wt%, Fe＜0.05wt%, Si＜0.05wt%, all the other are Al.This material microstructure is even, and crystal grain is tiny, does not have tangible microcosmic and macrosegregation phenomenon and takes place.By appropriate heat treatment, the main mechanical property of material reaches: σ
b=750～780Mpa, σ
0.2=720～750MPa, δ
5=8～11%, K
IC(MPa*m
1/2) 〉=31, da/dN≤6 * 10
-3Mm/cycle.
A kind of preparation method who is applicable to the superstrength and supertoughness, high destroy limit type aluminium alloy material of manufacturing limit tensile strength more than 750MPa of the present invention, this method comprises the steps:
(1) by alloying constituent, by weight percentage, this alloying constituent is Zn 9～10wt%, Mg2.0～2.5wt%, Cu 1.2～1.7wt%, Zr 0.2～0.5wt%, Fe＜0.05wt%, Si＜0.05wt%, all the other are Al, prepare burden preparation prealloy ingot;
(2) heat up after the prefabricated ingot fusing of alloy, adopt rare gas element and atomize by atomizing nozzle, atomizing nozzle is with the frequency high-speed sweep of 1～5HZ, and atomizing gas is a high purity inert gas, and atomizing pressure is 0.5～1.0Mpa;
(3) in aerosolization, with the speed high speed rotating of 60～120rpm, and the velocity pull-down of and 20～40mm/min drop-down with 30～40 ° angle is made billet to receiving trap under the traction of variable-frequency motor;
(4) carry out hot extrusion or the moulding of forge hot compression technology, be processed into required parts;
(5) these parts are carried out twin-stage solid solution and two-stage time effect, promptly make the superstrength and supertoughness, high destroy limit type aluminium alloy material of high Zn content.
Zn of the present invention, Al, Cu, Mg, Zr choose technical pure Zn, industrial pure Al, electrolysis Cu, technical pure Mg, Al-Zr master alloy.
In the step (1) of method of the present invention, the process of described preparation prealloy ingot is to be warming up to 850～900 ℃ with raw material fusing under protection of inert gas, to be mixedly is cast into the prealloy ingot after evenly.
In the step (2) of method of the present invention; described is with the prealloy ingot antivacuum reaction-injection moulding equipment of packing into the prefabricated ingot melting process of alloy; ℃ melt alloy pig induction heating to 800～850 under insulating covering agent protection; insulation 10～20min makes the alloy melt homogenizing, and adds deslagging agent and refining agent carries out the degasification deslagging refining.Employed insulating covering agent is conventional insulating covering agent.Employed antivacuum reaction-injection moulding equipment is open, and promptly the equipment such as tundish of induction heating smelting furnace, induction heating or resistive heating need not be airtight, is open, do not need vacuum system.
In the step (2) of method of the present invention, the described process that atomizes is to adopt unrestricted formula airflow atomizing nozzle to atomize.
In the step (2) of method of the present invention, described rare gas element is argon gas or nitrogen.
In the step (3) of method of the present invention, the described process of making billet is to be undertaken by the scanning, the shape and the mode of motion of receiving system of control atomizing nozzle, can prepare billet with typical rapid solidification tissue (Φ 200～300X300～1000mm).
In the step (4) of method of the present invention, be earlier billet to be stripped off the skin, the described process that billet is stripped off the skin is to adopt flaying machine processing to strip off the skin, and can be prepared into the excellent base of certain specification.And under 360～420 ℃, be incubated 2 hours, carry out the process of described hot extrusion or thermal forge-pressing-forming again.
In the step (5) of method of the present invention, the described process that parts are heat-treated is to carry out the twin-stage solution treatment, makes once and the abundant Hui Rong of secondary precipitated phase, carries out two-stage time effect again and handles.
The key of this invention is design of alloy, require each constituent content accurate, the alloying level height, main alloying element content height, emphasize that micro alloying element is assisted and strengthened, after adopting reaction-injection moulding preparation, rational thermal distortion processing and thermal treatment, realize many strengthening phases coupling and intensifying, the no second thick phase.Require low Fe, Si foreign matter content simultaneously, thereby guarantee high damage tolerance performance.
Another key factor of this invention is the reaction-injection moulding technology of preparing under this novel alloy condition, and the major technique details comprises following content:
Accurate for guaranteeing alloying constituent, select alap smelting temperature for use, in fusion process, add the insulating covering agent protection simultaneously, degasification slagging-off before the cast.
Be to guarantee carrying out continuously of preparation process, the present invention has studied a kind of highly purified SiN pottery thrust-augmenting nozzle material, and this material can anti-high temperature more than 1000 ℃, and has good erosion resistibility and the heat resistanceheat resistant performance of shaking, and can guarantee suitability for industrialized production continuously.
Receiving trap is made up of take-up reel, back shaft, rotation traction traction motor, lifting traction electric machine, transmission rig, dynamic seal system, take-up reel under the traction of rotation traction traction motor and lifting traction electric machine, can realize high speed rotating (0～120rpm) and stepless change descend (0～30mm/s).In preparation process, metal melt stream is broken into a large amount of tiny drops by the atomizing gas of high-speed flight, under the effect of gravity and atomizing gas, be accelerated flight forward, before solidifying but also do not solidify fully, atomizing droplet deposits in the take-up reel, by the speed of rotation and the lowering speed of control take-up reel, can obtain the billet of certain diameter.
In the step (4) of method of the present invention, the process of described described hot extrusion, its extrusion temperature is 380 ℃～420 ℃, be incubated 2h, and extrusion speed is 1～5m/min, and extrusion ratio reaches as high as 40: 1.
In the step (5) of method of the present invention, described with parts heat-treat comprise solution treatment and aging treatment process, the main purpose of solution treatment be make that the reaction-injection moulding preparation and the thermal distortion course of processing separate out once with the abundant Hui Rong of secondary precipitated phase.Solution treatment is the twin-stage solid solution among the present invention, and concrete system is: (440～450) ℃/1h+ (475～490) ℃/1.5h.
Carry out two-stage time effect then and handle, concrete system is: (110～120) ℃/(16～24) h+ (150～160) ℃/(6～10) h.Ultimate tensile strength through material after the ageing treatment can reach more than the 750MPa, has high plasticity and damage tolerance performance simultaneously.
Advantage of the present invention is:
This material is through accurately control alloying constituent, deformation processing, thermal treatment, and the ultimate tensile strength of material can reach more than the 750MPa, keeps higher plasticity and damage tolerance performance simultaneously.
Description of drawings
Fig. 1 is an antivacuum reaction-injection moulding device structure synoptic diagram of the present invention
Fig. 2 is a receiving trap structural representation of the present invention
Fig. 3 is an alloy block material microtexture photo of the present invention
Fig. 4 is the prepared billet photo of the present invention
Embodiment
The present invention can take following antivacuum reaction-injection moulding equipment to cooperate method of the present invention to be prepared powdered alloy.As shown in Figure 1, this antivacuum reaction-injection moulding equipment is to adopt to receive tank body 2, is provided with the tundish 4 of induction heating smelting furnace (not graphic), induction heating or resistive heating outside the top of reception tank body 2 from top to bottom successively.To the outlet of induction melting furnace, and the outlet of the tundish 4 of induction heating or resistive heating connects thrust-augmenting nozzle 5 in the import of induction heating tundish 4, and the outlet of thrust-augmenting nozzle 5 feeds and receives in the tank body 2.Around thrust-augmenting nozzle 5 tube walls, be provided with heating system (not graphic), and be provided with unrestricted formula airflow atomizing nozzle 7 in the exit of thrust-augmenting nozzle 5, the outlet section of thrust-augmenting nozzle 5 is positioned at the centre of unrestricted formula airflow atomizing nozzle, and what adopt between thrust-augmenting nozzle 5 and the unrestricted formula airflow atomizing nozzle 7 is to separate fit system.Because the alloy atomization temperature is very high, therefore in the aerosolization process, select complete unrestricted formula aerosolization nozzle for use, what adopt between thrust-augmenting nozzle and the nozzle in the course of the work is to separate fit system.Adopt this nozzle to carry out the preparation of aerosolization powdered alloy, the variety of problems of having been brought when having avoided high-meltiing alloy to atomize using to the restraint-type nozzle.Because when atomizing, atomizing gas will constantly flow into (flow is determined by nozzle parameter and atomizing pressure) therefore is provided with exhaust system in the bottom that receives tank body 2 interface from atomizing nozzle, atomizing gas is discharged receive tank body 2, and require the exhaust system airshed greater than the atomizing gas flow.
The receiving trap of preparation billet is installed in receiving tank body 2, and this receiving trap is a known equipment.As shown in Figure 3, receiving trap comprises two portions, be rotating part 21 and lifting unit 22, rotating part 21 be on received block 23, be provided with rotation traction traction motor 24, this rotation traction traction motor 24 is connected with back shaft 26 power by transmission rig, this back shaft 26 is provided with take-up reel 27; Lifting unit 22 is to be provided with lifting traction electric machine 28 on support, this lifting motor is connected with leading screw 30 power by transmission rig 29, and on support, be provided with the feed rod 31 parallel with leading screw 30, leading screw 30 becomes 30～35 angles with feed rod 31 with the vertical line of horizontal plane, received block 23 affixed stroke spares 32, stroke spare 32 is provided with nut and casinghead, nut and leading screw 30 are spirally connected, casinghead and feed rod 31 sockets in preparation process, start rotation traction traction motor 24, high speed rotating take-up reel 23, and start lifting traction electric machine 28, and leading screw 30 is rotated, nut also moves thereupon, and be that track slides on feed rod 31 with feed rod 31, with certain angle and velocity pull-down take-up reel 27, atomizing droplet is directly deposited in the take-up reel 27, obtain the billet of certain diameter.
Above-mentioned preparation facilities is in order to cooperate processing method of the present invention, to be not limited to this preparation facilities but finish method of the present invention, also can adopting the preparation facilities of alternate manner to carry out processing method of the present invention.
Embodiment 1:
Alloying constituent is Zn 10wt%, Mg 2.5wt%, Cu 1.7%, and Zr 0.5%, Fe＜0.05wt%, Si＜0.05wt%, all the other are Al, after the prefabricated ingot of alloyage, the smelting furnace of packing into is warming up to 800 ℃, insulation 30min, the slagging-off degasification, carry out the reaction-injection moulding preparation, adopt high-purity argon gas to carry out atomizing pressure 1.0Mpa.As shown in Figure 2, open rotating machine 24, lifting motor 28, with rotating speed is 60～120rpm, the high speed rotating take-up reel, the drop-down angle of take-up reel is to become 35 angles with the vertical line of horizontal plane, drop-down speed is 20～30mm/min, and drop-down take-up reel 27 directly deposits in the take-up reel 27 atomizing droplet.150 kilograms of novel alloys of disposable continuous atomizing are prepared the novel high-strength/tenacity aluminum alloy billet that weighs 100Kg, and prepared billet photo as shown in Figure 4.This deposition blank is processed into the excellent base of certain specification, at 410 ℃ of insulation 2h, carry out hot extrusion processing with 24: 1 extrusion ratios, squeeze out the pole of φ 30mm, 440 ℃/1h+480 ℃/the 1.5h solution treatment, institution of prescription adopts 120 ℃ of two-stage time effects/24h+160 ℃/8h.Ultimate tensile strength is 780MPa, and unit elongation is 11% simultaneously, K
IC=36MPa*m
1/2, this alloy is 0.1 in stress ratio, stress concentration factor is 1, specified life is 10
7Under the round-robin situation, safe range of stress can reach more than the 410MPa, brings up at 3 o'clock at stress concentration factor, and safe range of stress is higher than 130MPa; Da/dN≤6 * 10
-3Mm/cycle.As shown in Figure 3, this material microstructure is tiny, no significant defect and macrosegregation.
Form and be divided into Zn 10wt %, Mg 2.7wt%, Cu 1.7%, and Zr 0.1%, Ni 0.1% (application number is the composition of the embodiment 1 in 03119605.5 the patent application), adopt identical preparation and complete processing, just solution treatment is different with institution of prescription, adopts 435～440 ℃/1h+485～490 ℃/1.5h solution treatment, institution of prescription can adopt 120 ℃/24h of single-stage aging, ultimate tensile strength is 810MPa, and unit elongation is 10% simultaneously, K
IC=19MPa*m
1/2, this alloy is 0.1 in stress ratio, stress concentration factor is 1, specified life is 10
7Under the round-robin situation, safe range of stress is 380MPa, brings up at 3 o'clock at stress concentration factor, and safe range of stress is 100MPa, da/dN≤6 * 10
-3Mm/cycle.
It is embodiment 1 in 03119605.5 the patent application that the damage tolerance performance of the material of embodiments of the invention 1 is better than application number.
Embodiment 2:
Zn 9wt%, Mg 2.0wt%, Cu 1.3%, and Zr 0.2%, Fe＜0.05wt%, Si＜0.05wt%, all the other are after the prefabricated ingot of Al alloyage, and the smelting furnace of packing into is warming up to 800 ℃, insulation 10min, the reaction-injection moulding preparation is carried out in the slagging-off degasification, adopts high-purity argon gas to carry out, atomizing pressure 0.8MPa, and the rotating speed of the identical take-up reel of employing and embodiment 1, the angle that take-up reel is drop-down, drop-down speed, 100 kilograms of novel alloys of disposable continuous atomizing are prepared the novel high-strength/tenacity aluminum alloy billet that weighs 70Kg, this deposition blank is processed into the excellent base of certain specification, at 390 ℃ of insulation 2h, carry out hot extrusion processing with 24: 1 extrusion ratios, squeeze out the pole of Φ 25mm, 450 ℃/1h+485 ℃/the 1.5h solution treatment, institution of prescription adopts 115 ℃/16h+150 ℃/8h., ultimate tensile strength is 750MPa, unit elongation is 12% simultaneously, K
IC(MPa*m
1/2)=34, da/dN≤6 * 10
-3Mm/cycle.
Embodiment 3:
Zn 9.5wt%, Mg 2.3wt%, Cu 1.5%, and Zr 0.4%, Fe＜0.05wt%, Si＜0.05wt%, all the other are after the prefabricated ingot of Al alloyage, and the smelting furnace of packing into is warming up to 780 ℃, insulation 20min, the reaction-injection moulding preparation is carried out in the slagging-off degasification, adopts high pure nitrogen to carry out, atomizing pressure 0.8MPa, and the rotating speed of the identical take-up reel of employing and embodiment 1, the angle that take-up reel is drop-down, drop-down speed, 100 kilograms of novel alloys of disposable continuous atomizing are prepared the novel high-strength/tenacity aluminum alloy billet that weighs 70Kg, this deposition blank is processed into the excellent base of certain specification, at 400 ℃ of insulation 2h, carry out hot extrusion processing with 24: 1 extrusion ratios, squeeze out the pole of Φ 25mm, 440 ℃/1h+485 ℃/the 1.5h solution treatment, institution of prescription adopts 120 ℃/20h+160 ℃/10h., ultimate tensile strength is 760MPa, unit elongation is 11% simultaneously, K
IC(MPa*m
1/2)=34, da/dN≤6 * 10
-3Mm/cycle.
Claims (6)
1, a kind of superstrength and supertoughness, high destroy limit type aluminium alloy material of high Zn content, it is characterized in that: by weight percentage, this alloying constituent is Zn 9～10wt%, Mg 2.0～2.5wt%, Cu1.2～1.7wt%, Zr 0.2～0.5wt%, Fe＜0.05wt%, Si＜0.05wt%, all the other are Al, wherein, Fe and Si are impurity element.
2, a kind of method for preparing the superstrength and supertoughness, high destroy limit type aluminium alloy material of high Zn content, it is characterized in that: this method comprises the steps:
(1) by alloying constituent, by weight percentage, this alloying constituent is Zn 9～10wt%, Mg2.0～2.5wt%, Cu 1.2～1.7wt%, Zr 0.2～0.5wt%, Fe＜0.05wt%, Si＜0.05wt%, all the other are Al, prepare burden preparation prealloy ingot;
(2) heat up after the prefabricated ingot fusing of alloy, adopt rare gas element and atomize by atomizing nozzle, atomizing nozzle is with the frequency high-speed sweep of 1～5HZ, and atomizing gas is a rare gas element, and atomizing pressure is 0.5～1.0MPa;
(3) in aerosolization, with the speed high speed rotating of 60～120rpm, and the velocity pull-down of and 20～40mm/min drop-down with 30～40 ° angle is made billet to receiving trap under the traction of variable-frequency motor;
(4) carry out hot extrusion or the moulding of forge hot compression technology, be processed into required parts;
(5) parts are carried out twin-stage solution treatment and two-stage time effect and handle, promptly make the superstrength and supertoughness, high destroy limit type aluminium alloy material of high Zn content.
3, the method for the superstrength and supertoughness, high destroy limit type aluminium alloy material of preparation high Zn content according to claim 2, it is characterized in that: in described step (4), be earlier billet to be stripped off the skin, spray formed material is incubated 2 hours down at 380～420 ℃, carries out hot extrusion or the moulding of forge hot compression technology again.
4, the method for the superstrength and supertoughness, high destroy limit type aluminium alloy material of preparation high Zn content according to claim 3, it is characterized in that: in described step (5), the concrete system of twin-stage solution treatment is: (440～450) ℃/1h+ (475～490) ℃/1.5h.
5, according to the method for the superstrength and supertoughness, high destroy limit type aluminium alloy material of claim 3 or 4 described preparation high Zn contents, it is characterized in that: in described step (5), the concrete system that two-stage time effect is handled is: (110～120) ℃/(16～24) h+ (150～160) ℃/(6～10) h.
6, the method for the superstrength and supertoughness, high destroy limit type aluminium alloy material of preparation high Zn content according to claim 1 is characterized in that: the rare gas element that is adopted in step (2) is argon gas or nitrogen.
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| CN1204281C (en) * | 2002-03-05 | 2005-06-01 | 北京航空材料研究院 | High purity high strength aluminium alloy |
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2005
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