CN104561705A - Spray-formed 7xxx series aluminum alloy containing rare earth element Er and preparation method thereof - Google Patents
Spray-formed 7xxx series aluminum alloy containing rare earth element Er and preparation method thereof Download PDFInfo
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- CN104561705A CN104561705A CN201510085603.0A CN201510085603A CN104561705A CN 104561705 A CN104561705 A CN 104561705A CN 201510085603 A CN201510085603 A CN 201510085603A CN 104561705 A CN104561705 A CN 104561705A
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Abstract
The invention discloses a spray-formed 7xxx series aluminum alloy containing a rare earth element Er and a preparation method thereof. The spray-formed 7xxx series aluminum alloy containing the rare earth element Er comprises the following specific components in percent by weight: 0.3-0.8% of Er, 3.0-12.0% of Zn, 1.0-4.0% of Mg, 1.5-3.5% of Cu and the balanced of Al. The preparation method comprises the following steps: preparing all elements according to the proportion of the design components of the alloy, melting, casting to prefabricate ingots, re-melting, refining, spraying forming, performing hot extrusion to prepare aluminum alloy tube materials or bar materials, and performing solid solution and aging treatment to obtain aluminum alloy products with excellent strength and elongation. According to the prepared high-strength spray-formed 7xxx series aluminum alloy, due to the added rare earth element Er, on one hand, a melt body is purified, and impurities of solid solution of the alloy are reduced, so that the structure is optimized; on the other hand, grains can be refined, strengthening phases are separated out, the strength of the alloy is improved, the tensile strength of the alloy is 680MPa, and the elongation can be up to 15%.
Description
Technical field
The present invention relates to the manufacturing technology field of high performance aluminium materials, be specifically related to a kind of reaction-injection moulding 7xxx line aluminium alloy containing rare earth element er and preparation method thereof.
Background technology
7xxx line aluminium alloy is for background is developed and the class high-strength/tenacity aluminum alloy material grown up with aerospace material, there is very high tensile strength, higher toughness and erosion resistance can be kept again, all play an important role at aerospace, communications and transportation and other industrial sectors always.Improve zinc element content in 7xxx line aluminium alloy, effectively can improve the over-all properties of material, but then serious component segregation and hot tearing are easily occurred according to Foundry Production for large size 7xxx system aluminium conjunction ingot blank, therefore advanced spray forming technology can be adopted.
Spray forming technology is a kind of new material preparation technology after traditional fusion casting and powder metallurgic method, metal liquid stream is atomized into fine drop with high-pressure inert gas by it, and make it along the axis direction high-speed flight of nozzle, before these drops solidify not yet completely, the receiving body being deposited to definite shape is shaped.By the shape of reasonable design receiving body with control its mode of motion, just directly can prepare from liquid metal and there is rapid solidification structure feature, crystal grain is tiny, uniform composition, alloying element degree of supersaturation are high, overall fine and close difform deposit preform.
Have developed multiple reaction-injection moulding 7xxx line aluminium alloy, but still can not meet the use needs of complex conditions high-performance aluminium alloy, still need to improve its performance further, developing more high performance 7xxx system reaction-injection moulding aluminium alloy has realistic meaning very much.
Summary of the invention
The object of the invention is the use properties for improving 7xxx system reaction-injection moulding aluminium alloy further, find the rare earth element that a kind of price is relatively cheap, join in alloy with suitable amount, improve the weave construction of alloy, thus while consideration economy, performance is better improved.
To achieve these goals, the present invention by the following technical solutions: a kind of reaction-injection moulding 7xxx line aluminium alloy containing rare earth element er, comprises following component: Er 0.3% ~ 0.8% by mass percentage, Zn 3.0% ~ 12.0%, Mg 1.0% ~ 4.0%, Cu 1.5% ~ 3.5%, Al surplus.
Described 7xxx line aluminium alloy control impurity Si is less than 0.1%, Fe and is less than 0.1%, and other impurity is less than 0.3%, and single impurity is less than 0.05%.
Containing a preparation method for the reaction-injection moulding 7xxx line aluminium alloy of rare earth element er, comprise the following steps:
(1) fine aluminium melted completely and be incubated 700 ~ 800 DEG C, and adding dry halogenide covering, then adding Er, Cu, Zn, Mg, obtaining aluminum alloy melt;
(2) by above-mentioned aluminum alloy melt after degasification, the obtained prefabricated ingot of aluminium alloy;
(3) by after prefabricated for above-mentioned aluminium alloy ingot fusing, through tundish, thrust-augmenting nozzle, eject atomizing gas by gas-atomizing nozzle and reaction-injection moulding is carried out to the aluminum alloy melt flowed out through thrust-augmenting nozzle, deposit in take-up reel, atomizing gas is chosen as nitrogen, pressure 0.5 ~ 1.0 MPa, alloy melt temperature 750 DEG C ~ 900 DEG C, the temperature of tundish, thrust-augmenting nozzle 750 DEG C ~ 900 DEG C, take-up reel adopts mechanism control system to ensure and the distance of gas-atomizing nozzle is 400 ~ 600 mm; Improved by hot extrusion deformation and spray aluminium alloy density, then carry out conventional Homogenization Treatments and fixation rates.
Described element Er, Cu, Zn, Mg add with the form of aluminium-erbium, Solder for Al-Cu Joint Welding, zinc ingot metal and magnesium ingot.
The solid solubility temperature of described fixation rates is 460 ~ 470 DEG C, and solution time is 0.5 ~ 1 hour, and aging temp is 120 ~ 150 DEG C, and aging time is 16 ~ 24 hours.
Spray deposition processing is adopted to increase substantially the dissolving of Zn in aluminum substrate and can gain in strength, simultaneously can obvious refining alloy crystal grain, be conducive to the raising of alloy over-all properties.Rare earth erbium solubleness in the alloy also increases, but still very little, and therefore solution strengthening effect is atomic.Rare earth element er turns into similar to Sc at aluminium alloy interalloy, and relative low price, be a kind of important microalloy element.Rare earth Er easily and the element such as Al form intermetallic compound, this compound has inhibition to grain growth, the dendrite interval of aluminium alloy can be effectively reduced, crystal grain thinning tissue, compound can also be formed with various impurity element, eliminate the impact of detrimental impurity, its intermetallic compound Al formed
3er is on good terms as second increases the obdurability of aluminium alloy, puies forward heavy alloyed mechanical property and thermostability etc.Wherein a small amount of Er purifies melt by separating out from aluminium with the form of compound with the impurity in aluminium alloy, and the main and aluminium of superfluous Er forms Al
3er phase, puies forward heavy alloyed intensity and thermostability, and thus Er is fit closely rare earth metal addition.
Cleaning molten means are adopted in the cast sections preparing the prefabricated ingot of aluminium alloy, rare earth element er is added in alloy melt, melt can be purified, decrease pin hole rate, the whole preparation process of optimized alloy, make each alloying element separate out from sosoloid to greatest extent, guarantee tiny being distributed in complete aluminum substrate of second-phase dispersion, thus realize the optimization of tissue, the raising of intensity.
Concrete technology scheme of the present invention: first prepare the prefabricated ingot of aluminium alloy needed for reaction-injection moulding.Fine aluminium ingot is put into preheating 700 DEG C of induction furnaces to melt, after fine aluminium melts completely, temperature rises to 700 ~ 800 DEG C of insulations, the halide solvent adding oven dry after fine aluminium melts completely again covers, have anti-oxidation and the effect of absorption slag refining concurrently, being encased by Al-Cu master alloy aluminium foil good for proportioning directly joins in aluminium liquid, stir gently, Al-Cu master alloy is melted and fully diffusion, then will through pretreated pure zinc at about 720 DEG C, pure magnesium is successively pressed into bottom molten bath, then about 700 DEG C add Al-Er master alloy, treat to melt completely and be warming up to about 740 DEG C to melt hexachloroethane (C
2cl
6) carry out injection refining, degasification, slagging-off, covering, leave standstill 5 ~ 10min and be cast into prefabricated ingot in 700 ~ 710 DEG C.With the instrument of melt contacts all brush talcum powder dry, prevent melt air-breathing and contaminated.After prefabricated for above-mentioned aluminium alloy ingot remelting refining, through tundish, thrust-augmenting nozzle, eject atomizing gas by gas-atomizing nozzle and reaction-injection moulding is carried out to the aluminum alloy melt flowed out through thrust-augmenting nozzle, deposit in take-up reel, atomizing gas is nitrogen, pressure 0.5 ~ 1.0 MPa, alloy melt temperature 750 ~ 900 DEG C, the temperature of tundish, thrust-augmenting nozzle 750 ~ 900 DEG C, take-up reel adopts mechanism control system to ensure and the distance of gas-atomizing nozzle is 400 ~ 600 mm; Improved by hot extrusion deformation and spray aluminium alloy density, compression tool must be heated to 300 ~ 400 DEG C before extrusion.During extruding, deposit preform is heated to 45 ~ 550 DEG C, and overflow mould die holder, cylinder etc. are heated to 430 DEG C/3.5 hours, extrusion speed 3-15m/min.After hot extrusion, alloy carries out fixation rates, solid solubility temperature 460 ~ 470 DEG C, solution time 0.5 ~ 1 hour, and aging temp is 120 ~ 150 DEG C, aging time 16 ~ 24 hours, ensures MgZn
2, Al
3the second-phases such as Er in the precipitation of matrix, precipitated phase and matrix stress field less, while can effectively putting forward heavy alloyed intensity, significantly crystal grain thinning improves plasticity, thus improves the over-all properties of aluminium alloy.
The present invention adds rare earth element er first in 7xxx system reaction-injection moulding aluminium alloy, can the tissue of optimized alloy further, and put forward heavy alloyed intensity and thermostability, thus erbium is the rare earth metal addition of fit closely reaction-injection moulding 7xxx line aluminium alloy.7xxx line aluminium alloy of the present invention adopts conventional reaction-injection moulding preparation technology, and without the need to significantly transforming existing equipment, production cost is low, high comprehensive performance.
Accompanying drawing explanation
Fig. 1 is the metallographic structure of the cast alloy of the embodiment of the present invention 1.
Fig. 2 is the As-extruded Alloy Fracture pattern of the embodiment of the present invention 1.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated.
Embodiment 1
Get commercial-purity aluminium 100 kilograms, it is containing aluminium 99.7%, iron 0.08%, silicon 0.04%; Pure magnesium 3.8 kilograms; Industrial-purity zinc 11.6 kilograms; Solder for Al-Cu Joint Welding master alloy (50%Cu) 5.8 kilograms; Aluminium-erbium master alloy (10%Er) 5.2 kilograms; Above-mentioned raw materials is dropped into melting in chamber type electric resistance furnace in batches.First ready aluminium material is put into crucible, use resistance furnace heat fused, Kcl+Nacl (1:1) solvent adding oven dry after fine aluminium melts completely again covers (having anti-oxidation and the effect of absorption slag refining concurrently).Aluminum bronze intermediate alloy is added, after aluminum bronze intermediate alloy fusing, then by bottom pure zinc, pure magnesium press-in molten bath when temperature of aluminum liquid reaches 700 DEG C.Then 700 DEG C add Al-Er master alloy, and with hexachloroethane (C
2cl
6) degasifier degasification, leave standstill 5 ~ 10min and be cast into prefabricated ingot in 700 ~ 710 DEG C.By prefabricated ingot remelting refining, temperature 850 DEG C, is then poured into tundish, thrust-augmenting nozzle, and the nitrogen (pressure 0.6 MPa) ejected by gas-atomizing nozzle carries out reaction-injection moulding to the aluminium liquid flowed out through thrust-augmenting nozzle, deposit in take-up reel, obtaining diameter is the cylindric deposit preform of 400mm.Deposit preform is squeezed into the extruded rod of 80mm, in resistance furnace, then carries out solution treatment in 460 DEG C/0.5 hour, carry out 120 DEG C/16 hours ageing treatment in aging oven, air cooling of coming out of the stove.
Embodiment 2
Commercial-purity aluminium 100 kilograms, pure magnesium 4.0 kilograms, industrial-purity zinc 12.4 kilograms; Solder for Al-Cu Joint Welding master alloy (50%Cu) 6.2 kilograms; Aluminium-erbium master alloy (12% Er) 4.6 kilograms; Raw material is dropped into melting in chamber type electric resistance furnace in batches, is cast into prefabricated ingot in 700 ~ 710 DEG C.By prefabricated ingot remelting refining, temperature 800 DEG C, then pours into tundish, thrust-augmenting nozzle, and the nitrogen (pressure 0.8 MPa) ejected by gas-atomizing nozzle carries out reaction-injection moulding to the aluminium liquid flowed out through thrust-augmenting nozzle, and obtaining diameter is the cylindric deposit preform of 400mm.Deposit preform is squeezed into the extruded rod of 100mm, in resistance furnace, then carries out solution treatment in 470 DEG C/0.5 hour, carry out 125 DEG C/16 hours ageing treatment in aging oven, air cooling of coming out of the stove.
Embodiment 3
Commercial-purity aluminium 100 kilograms, pure magnesium 3.5 kilograms, industrial-purity zinc 10.6 kilograms; Solder for Al-Cu Joint Welding master alloy (50%Cu) 5.4 kilograms; Aluminium-erbium master alloy (10% Er) 4.8 kilograms; Above raw material is dropped into melting in chamber type electric resistance furnace in batches, is cast into prefabricated ingot in 700 ~ 710 DEG C.By prefabricated ingot remelting refining, temperature 850 DEG C, then poured into tundish, thrust-augmenting nozzle, the nitrogen (pressure 0.6 MPa) ejected by gas-atomizing nozzle carries out reaction-injection moulding to the aluminium liquid flowed out through thrust-augmenting nozzle, and obtaining diameter is the cylindric deposit preform of 400mm.Deposit preform is squeezed into the extruded rod of 80mm, in resistance furnace, then carries out solution treatment in 465 DEG C/0.5 hour, carry out 120 DEG C/20 hours ageing treatment in aging oven, air cooling of coming out of the stove.
Embodiment 4
Commercial-purity aluminium 100 kilograms, pure magnesium 3.5 kilograms, industrial-purity zinc 11.6 kilograms; Solder for Al-Cu Joint Welding master alloy (50%Cu) 5.5 kilograms; Aluminium-erbium master alloy (10% Er) 5.1 kilograms; Above raw material is dropped into melting in chamber type electric resistance furnace in batches, is cast into prefabricated ingot in 700 ~ 710 DEG C.By prefabricated ingot remelting refining, temperature 800 DEG C, then poured into tundish, thrust-augmenting nozzle, the nitrogen (pressure 0.8 MPa) ejected by gas-atomizing nozzle carries out reaction-injection moulding to the aluminium liquid flowed out through thrust-augmenting nozzle, and obtaining diameter is the cylindric deposit preform of 400mm.Deposit preform is squeezed into the extruded rod of 100mm, in resistance furnace, then carries out solution treatment in 460 DEG C/0.5 hour, carry out 125 DEG C/16 hours ageing treatment in aging oven, air cooling of coming out of the stove.
Embodiment 5
Commercial-purity aluminium 100 kilograms, pure magnesium 3.6 kilograms, industrial-purity zinc 12.2 kilograms; Solder for Al-Cu Joint Welding master alloy (50%Si) 5.3 kilograms; Aluminium-erbium master alloy (12% Er) 4.8 kilograms; Above raw material is dropped into melting in chamber type electric resistance furnace in batches, is cast into prefabricated ingot in 700 ~ 710 DEG C.By prefabricated ingot remelting refining, temperature 850 DEG C, then poured into tundish, thrust-augmenting nozzle, the nitrogen (pressure 0.6 MPa) ejected by gas-atomizing nozzle carries out reaction-injection moulding to the aluminium liquid flowed out through thrust-augmenting nozzle, and obtaining diameter is the cylindric deposit preform of 400mm.Deposit preform is squeezed into the extruded rod of 80mm, in resistance furnace, then carries out solution treatment in 470 DEG C/0.5 hour, carry out 120 DEG C/20 hours ageing treatment in aging oven, air cooling of coming out of the stove.
The Main Mechanical result of above-described embodiment is as table 1.
The Main Mechanical data of table 1 embodiment of the present invention
Above-described embodiment is exemplary illustration principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (5)
1., containing a reaction-injection moulding 7xxx line aluminium alloy for rare earth element er, it is characterized in that comprising following component by mass percentage: Er 0.3% ~ 0.8%, Zn 3.0% ~ 12.0%, Mg 1.0% ~ 4.0%, Cu 1.5% ~ 3.5%, Al surplus.
2. 7xxx line aluminium alloy according to claim 1, is characterized in that: described 7xxx line aluminium alloy control impurity Si is less than 0.1%, Fe and is less than 0.1%, and other impurity is less than 0.3%, and single impurity is less than 0.05%.
3. the preparation method of 7xxx line aluminium alloy according to claim 1 or 2, is characterized in that comprising the following steps:
(1) fine aluminium melted completely and be incubated 700 ~ 800 DEG C, and adding dry halogenide covering, then adding Er, Cu, Zn, Mg, obtaining aluminum alloy melt;
(2) by above-mentioned aluminum alloy melt after degasification, the obtained prefabricated ingot of aluminium alloy;
(3) by after prefabricated for above-mentioned aluminium alloy ingot fusing, through tundish, thrust-augmenting nozzle, eject atomizing gas by gas-atomizing nozzle and reaction-injection moulding is carried out to the aluminum alloy melt flowed out through thrust-augmenting nozzle, deposit in take-up reel, atomizing gas is chosen as nitrogen, pressure 0.5 ~ 1.0 MPa, alloy melt temperature 750 DEG C ~ 900 DEG C, the temperature of tundish, thrust-augmenting nozzle 750 DEG C ~ 900 DEG C, take-up reel adopts mechanism control system to ensure and the distance of gas-atomizing nozzle is 400 ~ 600 mm; Improved by hot extrusion deformation and spray aluminium alloy density, then carry out conventional Homogenization Treatments and fixation rates.
4. preparation method according to claim 3, is characterized in that: described element Er, Cu, Zn, Mg add with the form of aluminium-erbium, Solder for Al-Cu Joint Welding, zinc ingot metal and magnesium ingot.
5. preparation method according to claim 3, is characterized in that: the solid solubility temperature of described fixation rates is 460 ~ 470 DEG C, and solution time is 0.5 ~ 1 hour, and aging temp is 120 ~ 150 DEG C, and aging time is 16 ~ 24 hours.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104975205A (en) * | 2015-06-02 | 2015-10-14 | 金海新源电气江苏有限公司 | Treatment process of aluminum alloy section for photovoltaic assembly support |
| CN107502797A (en) * | 2017-10-24 | 2017-12-22 | 辽宁忠大铝业有限公司 | A kind of heat-resistant rare earth aluminium alloy of intensity stabilization and preparation method thereof |
| CN108300915A (en) * | 2018-01-24 | 2018-07-20 | 中南大学 | A kind of Al-Zn-Mg-Cu systems aerolite and preparation method thereof |
| CN109609818A (en) * | 2018-10-11 | 2019-04-12 | 江苏豪然喷射成形合金有限公司 | A kind of preparation method of high bullet-proof aluminum alloy plate materials |
| CN109652670A (en) * | 2019-02-26 | 2019-04-19 | 中南大学 | A kind of preparation method of Spray-formed Aluminum Alloy |
| CN111286649A (en) * | 2020-03-25 | 2020-06-16 | 广东省工业分析检测中心 | High-strength heat-resistant lead-free-cutting aluminum alloy and preparation method thereof |
| CN112831735A (en) * | 2020-12-30 | 2021-05-25 | 江苏理工学院 | Preparation method of high-strength aluminum alloy wire/strip |
| CN114686735A (en) * | 2022-03-11 | 2022-07-01 | 山东南山铝业股份有限公司 | Wrought aluminum alloy with gradient structure and preparation method thereof |
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2015
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| LIU YING-YING ET AL.: "Effect of heat treatment on microstructures and mechanical properties of Al-6Zn-2Mg-1.5Cu-0.4Er alloy", 《J. CENT. SOUTH UNIV. TECHNOL.》 * |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104975205A (en) * | 2015-06-02 | 2015-10-14 | 金海新源电气江苏有限公司 | Treatment process of aluminum alloy section for photovoltaic assembly support |
| CN107502797A (en) * | 2017-10-24 | 2017-12-22 | 辽宁忠大铝业有限公司 | A kind of heat-resistant rare earth aluminium alloy of intensity stabilization and preparation method thereof |
| CN108300915A (en) * | 2018-01-24 | 2018-07-20 | 中南大学 | A kind of Al-Zn-Mg-Cu systems aerolite and preparation method thereof |
| CN109609818A (en) * | 2018-10-11 | 2019-04-12 | 江苏豪然喷射成形合金有限公司 | A kind of preparation method of high bullet-proof aluminum alloy plate materials |
| CN109652670A (en) * | 2019-02-26 | 2019-04-19 | 中南大学 | A kind of preparation method of Spray-formed Aluminum Alloy |
| CN111286649A (en) * | 2020-03-25 | 2020-06-16 | 广东省工业分析检测中心 | High-strength heat-resistant lead-free-cutting aluminum alloy and preparation method thereof |
| CN111286649B (en) * | 2020-03-25 | 2021-09-03 | 广东省科学院工业分析检测中心 | High-strength heat-resistant lead-free-cutting aluminum alloy and preparation method thereof |
| CN112831735A (en) * | 2020-12-30 | 2021-05-25 | 江苏理工学院 | Preparation method of high-strength aluminum alloy wire/strip |
| CN112831735B (en) * | 2020-12-30 | 2022-07-08 | 江苏理工学院 | Preparation method of high-strength aluminum alloy wire/strip |
| CN114686735A (en) * | 2022-03-11 | 2022-07-01 | 山东南山铝业股份有限公司 | Wrought aluminum alloy with gradient structure and preparation method thereof |
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