CN103305731A - Ultra-high-strength wrought aluminum alloy containing rare-earth yttrium - Google Patents
Ultra-high-strength wrought aluminum alloy containing rare-earth yttrium Download PDFInfo
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Abstract
The invention discloses an ultra-high strength wrought aluminum alloy containing rare-earth yttrium. The ultra-high strength wrought aluminum alloy comprises the following components in percentage by mass: 7.5-9.0% of Zn, 2.0-2.6% of Cu, 2.0-3.0% of Mg, 0.2-0.3% of Y, 0.1-0.2% of Zr and the balance of aluminum. According to the ultra-high strength wrought aluminum alloy, yttrium is added into an Al-Zn-Cu-Mg melt, then can be combined with a small amount of impurity atoms including O, H, N, S and Fe in the melt to generate tiny high-melting compounds containing yttrium, and plays a role in purifying the melt; the yttrium is segregated at a crystal boundary to inhibit elements including Zn, Mg and Cu from diffusing during solidification and causing constitutional supercooling, so that the growth of cellular crystals and arborescent crystals, the number of crystals is increased, and the size of the crystals is reduced.
Description
Technical field
The invention belongs to wrought aluminium alloy material preparation technology and Grain Refinement field, relate to a kind of ultra-high-strength aluminum alloy structured material for the manufacture of special machine equipment such as aerospace, especially a kind of superelevation severe deformation aluminium alloy that adds rare-earth yttrium.
Background technology
Along with the development of aerospace industry, aircraft of new generation is had higher requirement to material, such as lightweight, high-strength, high-ductility and corrosion-resistant etc.In order to satisfy this demand, many countries are all in the research and development of carrying out novel high-strength, tenacity aluminum alloy in the world.Wherein the Al-Zn-Mg-Cu series high-strength aluminum alloy be up to now the highest aluminum alloy materials of getable intensity, they had both had the above tensile strength of 600MPa, can keep again higher toughness and erosion resistance, and cost is lower, the mechanical property that it is good, higher specific tenacity, all significant to the over-all properties that improves aircraft and security, economy, become indispensable important lightweight structural material in the present dual-use aircraft.But from present aerospace material growth requirement, require material can under hot conditions, have stable Rigidity and strength, be called for short heat resistance.The novel material that arises at the historic moment has intermetallic compound, metal-base composites, novel Ni alloy, Ti alloy etc., but cost is higher.
The application of rare earth in aluminium alloy is unusual one of important field of research always, not only plays metamorphism in cast aluminium alloy, also to the aluminium alloy aseptic.Wherein yttrium is large than the solubleness of other alloying element in aluminium alloy, becomes gradually one of rare earth element of materialogy Experts ' Attention.Al-Zn-Mg-Cu is associated metal in the high-strength and high ductility wrought aluminium alloy, alloying element mainly contains Zn, Cu, Mg etc., alloying element content nearly 15%, the solidified structure interalloy is many mutually, interaction is complicated, and bring into play the characteristic of aluminum alloy high-strength high-ductility, need the defects count in the strict control alloy structure, require high to melt purification.
Summary of the invention
The object of the present invention is to provide a kind of superelevation severe deformation aluminium alloy that adds rare-earth yttrium, this alloy joins rare earth element yttrium in the Al-Zn-Mg-Cu line aluminium alloy, thereby improve the alloy heat resistance by process control, improve the heat resistance of Al-Zn-Mg-Cu series high-strength aluminum alloy, satisfied the aerospace of present develop rapidly and the requirement of special machine equipment.
The objective of the invention is to be achieved through the following technical solutions:
A kind of superelevation severe deformation aluminium alloy that adds rare-earth yttrium, the mass percent of its component concentration is: Zn:7.5～9.0%, Cu:2.0～2.6%, Mg:2.0～3.0%, Y:0.2～0.3%; Zr:0.1～0.2%, surplus are aluminium.
And, described Fe :≤0.05%, Si :≤0.05%.
The preparation method of above-mentioned alloy, step is as follows:
⑴ the requirement that contain the mass percent of yttrium superelevation severe deformation aluminium alloy is: Zn:7.5～9.0%, Cu:2.0～2.6%, Mg:2.0～3.0%, Y:0.2～0.3%; Zr:0.1～0.2%;
Take by weighing respectively metallic zinc, metallic copper, magnalium master alloy, aluminium yttrium master alloy, aluminium zirconium hardener, refined aluminium ingot in above ratio;
⑵ take by weighing without sodium refining slag-cleaning agent by the 0.2～0.4wt% that always feeds intake, and presses 0.5～0.8kg/m according to the bath surface area
2Take by weighing magnesium alloy covering agent;
⑶ put into the metallic zinc among step ⑴, the step ⑵, metallic copper, magnalium master alloy, aluminium yttrium master alloy, aluminium zirconium hardener, refined aluminium ingot, refining slag-cleaning agent and magnesium alloy covering agent the dry 2～3h of constant temperature preheating and drying stove of 200～300 ℃ of temperature;
⑷ put into industrial furnace with the refined aluminium among the step ⑶, and setting the industrial furnace furnace temperature is 750-850 ℃, and temperature of aluminum liquid is 700-800 ℃;
⑸ energising heating 3h～4h treats that the refined aluminium ingot in the stove all melts, and melt overheat is preheated to 200～300 ℃ metallic copper, aluminium zirconium hardener among the adding step ⑶ after 700-760 ℃;
⑹ adjust to 680 ℃ with melt temperature, adds the metallic zinc among the step ⑶, stirs aluminium liquid 1～2min;
⑺ adjust to 730～750 ℃ with melt temperature, adds the refining slag-cleaning agent among the step ⑶, and the rear static 1～2min that stirs claws dross on surface of fusant;
⑻ add the aluminium yttrium master alloy among the step ⑶, stirs 1～2min;
⑼ preheating degasification rod is set as 0.1MPa with argon flow amount, carries out degasification, degasification time 10-30min;
⑽ be down to 680 ℃ with melt temperature, with bell jar the magnalium master alloy that is preheated to 200～300 ℃ among the step ⑶ is pressed into the crucible center, and slowly revolution is mobile, then adds the aluminum magnesium alloy insulating covering agent among the step ⑶;
⑾ alloying stirs aluminium alloy after finishing gently, and the aluminium alloy temperature is adjusted to 720～730 ℃, and static insulation 4～5min pours in the AOEM mould, and die temperature remains on 150～200 ℃, must contain the superelevation severe deformation aluminium alloy of rare-earth yttrium.
Advantage of the present invention and positively effect are:
1, element zinc, magnesium, the copper interaction in aluminium alloy in this material effectively raises the tensile strength of alloy, and three kinds of constituent contents are at specific proportional range, is conducive to improve the material stress corrosion drag and to the strengthening effect of material.
2, the present invention adds 0.1～0.2% zr element first, but refinement cast structure not only, and can stop recrystallization process, the refinement recrystal grain.
3, after the present invention joins the Al-Zn-Cu-Mg melt with yttrium, the impurity atomss such as a small amount of O, H that can in melt, exist, N, S, Fe be combined generate tiny infusibility contain the yttrium simple compounds, and can contaminated melt, played the cleaning molten effect; Because large, the characteristics such as solid solubility is little, the effect of segregation of yttrium atom radius are the refinement As-cast Microstructure effectively, the matrix grain degree drops to 40～50 μ m from 60～70 μ m; In addition, yttrium has suppressed the diffusions of element in process of setting such as Zn, Mg, Cu in the grain boundaries segregation, has caused constitutional supercooling, has promoted the growth of born of the same parents' dendrite arm crystalline substance, and eutectic quantity increases size reduction.
4, the adding of rare earth element yttrium makes the tensile strength after the alloy material thermomechanical treatment bring up to 740～760Mpa by 630 original～660Mpa, and the heat resistance of material improves greatly.
5, the present invention joins rare earth element yttrium in the Al-Zn-Mg-Cu line aluminium alloy, thereby improve the alloy heat resistance by process control, improved the heat resistance of Al-Zn-Mg-Cu series high-strength aluminum alloy, the aerospace of present develop rapidly and the requirement of special machine equipment have been satisfied, rare earth resources is utilized effectively simultaneously, has given full play to the advantage of China's rare earth resources.
Description of drawings
Fig. 1 is that the present invention adds rare-earth yttrium front and back aluminum alloy materials tensile strength comparison diagram (material is T7751 thermomechanical treatment state).
Embodiment
Below in conjunction with embodiment, the present invention is further described, and following embodiment is illustrative, is not determinate, can not limit protection scope of the present invention with following embodiment.
The XH-2 type magnesium alloy smelting insulating covering agent that the HGJ-2 type that the upper marine rainbow light metal flux factory that following examples are used produces is produced without sodium refining slag-cleaning agent and Xuzhou City rising sun brightness Aluminum company limited, what other producers originated can realize the present invention without sodium refining slag-cleaning agent and magnesium alloy covering agent, also cries without the sodium slag-cleaning agent without sodium refining slag-cleaning agent.
Embodiment 1:
A kind of superelevation severe deformation aluminium alloy that adds rare-earth yttrium, the requirement of mass percent is: Zn:8%, Cu:2.2%, Mg:2.3%, Y:0.23%; Zr:0.16%, Fe :≤0.05%, Si :≤0.05%, surplus is aluminium.
Take by weighing respectively metallic zinc, metallic copper, magnalium master alloy (AlMg50), aluminium yttrium master alloy (AlY5), aluminium zirconium hardener (AlZr10), refined aluminium ingot (purity is greater than 99.95%) in above ratio;
Concrete preparation process is as follows:
⑴ always feed intake and be 50Kg, takes by weighing metallic zinc 4kg, metallic copper 1.1kg, magnalium master alloy (AlMg50) 2.3kg, aluminium yttrium master alloy (AlY5) 2.3kg, aluminium zirconium hardener (AlZr10) 0.8, refined aluminium ingot 39.5kg;
⑵ take by weighing the HGJ-2 type of the upper marine rainbow light metal flux factory of 0.15kg production without sodium refining slag-cleaning agent, takes by weighing the XH-2 type magnesium alloy covering agent that 0.12kg Xuzhou City rising sun brightness Aluminum company limited produces;
⑶ put into the metallic zinc among step ⑴, the step ⑵, metallic copper, magnalium master alloy, aluminium yttrium master alloy, aluminium zirconium hardener, refined aluminium ingot, refining slag-cleaning agent and aluminum magnesium alloy insulating covering agent respectively the dry 3h of constant temperature preheating and drying stove of 240 ℃ of temperature;
⑷ put into CX-GR-150 type industrial furnace with the refined aluminium ingot among the step ⑶, and setting the industrial furnace furnace temperature is 800 ℃, and temperature of aluminum liquid is 750 ℃;
⑸ energising heating 3.5h treats that the refined aluminium ingot in the stove all melts, and behind the melt overheat to 740 ℃, adds among the step ⑶ and is preheated to 240 ℃ metallic copper, aluminium zirconium hardener;
⑹ adjust to 680 ℃ with melt temperature, adds the metallic zinc among the step ⑶, sinks by the deadweight of spelter, stirs aluminium liquid 1min;
⑺ adjust to 730 ℃ with melt temperature, add among the step ⑶ without sodium refining slag-cleaning agent, stir rear static 2min, claw dross on surface of fusant;
⑻ add the aluminium yttrium master alloy among the step ⑶, stirs 2min;
⑼ preheating degasification rod is set as 0.1MPa with argon flow amount, carries out degasification, and the degasification time is 12min;
⑽ be down to 680 ℃ with melt temperature, with bell jar the magnalium master alloy that is preheated to 240 ℃ among the step ⑶ is pressed into the crucible center, and slowly revolution is mobile, then adds the aluminum magnesium alloy insulating covering agent among the step ⑶;
⑾ alloying stirs aluminium alloy after finishing gently, and the aluminium alloy temperature is adjusted to 725 ℃, and static insulation 5min pours in the AOEM mould, and die temperature remains on 150～200 ℃.
The ingot casting of cast is after the T7751 thermomechanical treatment, and tensile strength is 749Mpa, yield strength 7410Mpa, unit elongation 12.5%.
Embodiment 2:
A kind of superelevation severe deformation aluminium alloy that adds rare-earth yttrium, the requirement of mass percent is: Zn:8.8%, Cu:2.5%, Mg:2.8%, Y:0.26%; Zr:0.15%, Fe :≤0.05%, Si :≤0.05%, amount is aluminium.
With regard to the present embodiment, if there is the occurrence of elemental range preferably to provide.
⑴ always feed intake and be 50kg, takes by weighing metallic zinc 4.4kg, metallic copper 1.25kg, magnalium master alloy (AlMg50) 2.8kg, aluminium yttrium master alloy (AlY5) 2.6kg, aluminium zirconium hardener (AlZr10) 0.75kg, refined aluminium ingot 38.2kg;
⑵ take by weighing the HGJ-2 type of the upper marine rainbow light metal flux factory of 0.17kg production without sodium refining slag-cleaning agent, takes by weighing the XH-2 type magnesium alloy smelting insulating covering agent that 0.14kg Xuzhou City rising sun brightness Aluminum company limited produces;
⑶ put into the metallic zinc among step ⑴, the step ⑵, metallic copper, magnalium master alloy, aluminium yttrium master alloy, aluminium zirconium hardener, refined aluminium ingot, refining slag-cleaning agent and magnesium alloy covering agent the dry 2h of constant temperature preheating and drying stove of 280 ℃ of temperature;
⑷ put into CX-GR-150 type industrial furnace with the refined aluminium ingot among the step ⑶, and setting the industrial furnace furnace temperature is 800 ℃, and temperature of aluminum liquid is 750 ℃;
⑸ energising heating 4h treats that the refined aluminium ingot in the stove all melts, and behind the melt overheat to 740 ℃, adds in the step (3) and is preheated to 280 ℃ metallic copper, aluminium zirconium hardener;
⑹ adjust to 680 ℃ with melt temperature, adds the metallic zinc among the step ⑶, sinks by the deadweight of spelter, stirs aluminium liquid 2min;
⑺ adjust to 745 ℃ with melt temperature, adds the refining slag-cleaning agent among the step ⑶, stirs rear static 1.5min, claws dross on surface of fusant;
⑻ add the aluminium yttrium master alloy among the step ⑶, stirs 1min;
⑼ preheating degasification rod is set as 0.1MPa with argon flow amount, carries out degasification, and the degasification time is 14 minutes;
⑽ be down to 680 ℃ with melt temperature, with bell jar the magnalium master alloy that is preheated to 280 ℃ among the step ⑶ is pressed into the crucible center, and slowly revolution is mobile, then adds the aluminum magnesium alloy insulating covering agent among the step ⑶;
⑾ alloying stirs aluminium alloy after finishing gently, and the aluminium alloy temperature is adjusted to 726 ℃, and static insulation 4min pours in the AOEM mould, and die temperature remains on 150～200 ℃.
The ingot casting of cast is after the T7751 thermomechanical treatment, and tensile strength is 758Mpa, yield strength 746Mpa, unit elongation 14.3%.
Claims (2)
1. superelevation severe deformation aluminium alloy that adds rare-earth yttrium, it is characterized in that: the mass percent of its component concentration is: Zn:7.5～9.0%, Cu:2.0～2.6%, Mg:2.0～3.0%, Y:0.2～0.3%; Zr:0.1～0.2%, surplus are aluminium.
2. the superelevation severe deformation aluminium alloy of interpolation rare-earth yttrium according to claim 1 is characterized in that: described Fe :≤0.05%, Si :≤0.05%.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108300912A (en) * | 2018-02-08 | 2018-07-20 | 盐城市鑫洋电热材料有限公司 | A kind of high resistance conducting alloy |
| CN110669967A (en) * | 2019-09-23 | 2020-01-10 | 山东南山铝业股份有限公司 | Rapid-extrusion high-strength wrought aluminum alloy and preparation method thereof |
| CN111057920A (en) * | 2020-01-07 | 2020-04-24 | 西南交通大学 | Ultrahigh-strength aluminum alloy and preparation method thereof |
| CN111101033A (en) * | 2019-12-20 | 2020-05-05 | 山东南山铝业股份有限公司 | Low-alloying aluminum alloy and multistage heat treatment strengthening process thereof |
| CN114480933A (en) * | 2022-01-25 | 2022-05-13 | 郑州轻研合金科技有限公司 | Ultra-high-strength aluminum alloy and preparation method and application thereof |
| CN115216674A (en) * | 2022-07-11 | 2022-10-21 | 上海交通大学 | 7000 series aluminum alloy sheet for automobile and preparation method thereof |
-
2013
- 2013-05-16 CN CN 201310180712 patent/CN103305731A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108300912A (en) * | 2018-02-08 | 2018-07-20 | 盐城市鑫洋电热材料有限公司 | A kind of high resistance conducting alloy |
| CN110669967A (en) * | 2019-09-23 | 2020-01-10 | 山东南山铝业股份有限公司 | Rapid-extrusion high-strength wrought aluminum alloy and preparation method thereof |
| CN111101033A (en) * | 2019-12-20 | 2020-05-05 | 山东南山铝业股份有限公司 | Low-alloying aluminum alloy and multistage heat treatment strengthening process thereof |
| CN111057920A (en) * | 2020-01-07 | 2020-04-24 | 西南交通大学 | Ultrahigh-strength aluminum alloy and preparation method thereof |
| CN111057920B (en) * | 2020-01-07 | 2022-05-06 | 西南交通大学 | Ultrahigh-strength aluminum alloy and preparation method thereof |
| CN114480933A (en) * | 2022-01-25 | 2022-05-13 | 郑州轻研合金科技有限公司 | Ultra-high-strength aluminum alloy and preparation method and application thereof |
| CN115216674A (en) * | 2022-07-11 | 2022-10-21 | 上海交通大学 | 7000 series aluminum alloy sheet for automobile and preparation method thereof |
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Application publication date: 20130918 |