CN101967589A - Medium-strength high-toughness aluminum lithium alloy and preparation method thereof - Google Patents

Medium-strength high-toughness aluminum lithium alloy and preparation method thereof Download PDF

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CN101967589A
CN101967589A CN 201010520989 CN201010520989A CN101967589A CN 101967589 A CN101967589 A CN 101967589A CN 201010520989 CN201010520989 CN 201010520989 CN 201010520989 A CN201010520989 A CN 201010520989A CN 101967589 A CN101967589 A CN 101967589A
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alloy
percent
ductility
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CN101967589B (en
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冯朝辉
陆政
孙刚
张显峰
谢优化
卢健
王胜强
龚澎
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BEIJING INSTITUTE OF AERONAUTICAL MATERIALS CHINA AVIATION INDUSTRY GROUP Corp
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Abstract

The invention discloses a medium-strength high-toughness aluminum lithium alloy and a preparation method thereof. The aluminum lithium alloy comprises the following components in percentage by weight: 2.2 to 3.2 percent of Cu, 1.1 to 2.0 percent of Li, 0.10 to 0.70 percent of Mn, 0.05 to 1.0 percent of Zn, 0.05 to 0.16 percent of Zr, 0.10 to 0.80 percent of Mg, 0.2 to 0.6 percent of Ag, less than or equal to 0.10 percent of Si, less than or equal to 0.10 percent of Fe, less than or equal to 0.12 percent of Ti, less than or equal to 0.15 percent of other impurities (less than or equal to 0.05 percent of single impurity), and the balance of Al, wherein 1 to 5 alloy elements of Mn, Zn, Mg, Ag and Zr can be selectively added. The preparation method comprises the following steps of: melting the raw material, performing furnace refining, standing, and casting into alloy ingots with the needed specification. The alloy ingots are preferably homogenized, can be processed and molded through hot extrusion, hot rolling or hot extrusion, and can be used for processing parts after heat treatment of preferable technology. The novel medium-strength high-toughness aluminum lithium alloy material has the advantages of uniform microscopic structure, stable performance, suitability for manufacturing thick plates and extruded sections, the ultimate tensile strength of over 440MPa, the elongation rate of over 6 percent and the KIc of over 36MPam1/2.

Description

Strong high-ductility Al-Li alloy and preparation method thereof in a kind of
Technical field
The present invention be a kind of in strong high-ductility Al-Li alloy and preparation method thereof, belong to the metal material engineering field.
Background technology
In recent years, raising along with metallurgy of aluminium equipment technology and metallurgy basic technology level, Al-Li alloy has experienced three generations's development, and the metallurgical principle of design of Al-Li alloy develops into: moderate intensity, lower slightly density, less anisotropy, and give full play to its rigidity and anti-damage advantage.On producing, pursue lower technology cost, show as its production technique more near common aluminum alloy.
Along with aircraft industry, the particularly intensified competition of large-sized civil aircraft industry, aircraft manufacturing companies such as Boeing, Air Passenger, Pang Badi and Chinese Shang Fei design the economy and the high life of aircraft operation as its core technology one after another.Structure loss of weight and to select the material of anti-the damage for use be the important means that realizes this core technology, advanced Al-Li alloy can satisfy above two requirements simultaneously, the present invention can be used to substitute the 2124-T851 slab and uses aboard, but loss of weight 10～15% is estimated work-ing life and can be improved more than 4 times.Have broad application prospects in fields such as aerospace, nuclear industry, communications and transportation, sports goods, weapons.
In recent years, the America and Europe has carried out three generations's high-performance aluminum lithium alloy research, and some is arranged near the level of suitability for industrialized production.On behalf of alloy, it 2297 alloys (Al-2.8Cu-1.5Li-0.30Mn-0.12Zr), 2397 alloys (Al-2.8Cu-1.4Li-0.30Mn-0.12Zr-0.10Zn), 2099/2199 alloy (Al-2.7Cu-1.8Li-0.7Zn-0.30Mg-0.30Mn-0.12Zr) and 2196 alloys (Al-2.65Cu-1.6Li-0.55Mg-0.4Ag-0.12Zr) are arranged.
The production tradition of Al-Li alloy is by former Soviet Union technology and American-European technology, former Soviet Union process using vacuum melting technology, development and production Al-Mg-Li system and Al-Mg-Li-Sc be Al-Li alloy, and on multiple model, use; American-European countries more develops the gas refinement technology, and alloy system is main with Al-Cu-Li, studies show that, different refining techniquess is equivalent under the technology controlling and process preferably.
Summary of the invention
The present invention design at above-mentioned prior art situation just provide a kind of in strong high-ductility Al-Li alloy and preparation method thereof, its objective is?
The objective of the invention is to be achieved through the following technical solutions:
Technical solution of the present invention proposed a kind of in strong high-ductility Al-Li alloy, it is characterized in that: the chemical ingredients of alloy and weight percent are: Cu 2.2～3.2%, Li 1.1～2.0%, Si≤0.10%, Fe≤0.10%, Ti≤0.12%, other impurity is single≤and 0.05%, total amount≤0.15%, surplus are Al.
Also add 1～5 kind among Mn, Zn, Mg, Ag and the Zr in the chemical ingredients of this alloy, the weight percent of adding is: Mn 0.10～0.70%, and Zn 0.05～1.0%, and Zr 0.05～0.16%, Mg≤0.10%～0.80%, Ag0.2～0.6%.
The intensity of aluminum bronze lithium alloy depends primarily on the alloying element total amount of Li+Cu, plasticity depends on the solid solution degree, with lithium equivalent (Li+Cu/2.82) can the guestimate alloy the solid solution degree, when the Li+Cu total amount surpasses 5%, the intensity of its extruding rod can reach more than the 500Mpa, and the Li equivalent is controlled at 2.4～2.6 when following, and the plasticity of alloy can be guaranteed about 6%.The present invention controls the Li+Cu total amount near 5%, and the Li equivalent is about 2.4, thereby guarantees alloy strength and plasticity.
Al-Li is that the anisotropy of alloy derives from coplane slippage and the texture that δ ' causes mutually, and the coplane slippage that adds affiliation inhibition δ ' phase of Zr has good malleableize effect to alloy simultaneously, but can not reduce the anisotropy of alloy significantly.The present invention takes Zr+Mn to unite the mode of adding, thereby reduces the anisotropy of aluminium-lithium-copper alloy significantly.
Trace elements such as Mg, Zn, Ag all have certain highly malleablized effect to the Al-Li-Cu alloy, and wherein the associating microalloying strengthening effect of Mg+Ag is best, and Mg+Zn takes second place.The present invention can consider to produce Mg+Ag and Mg+Zn microalloying Al-Li alloy from different aspects such as tough coupling and performance/costs, also can produce the Al-Li alloy of few no microalloying.This alloy is applicable to 10mm～180mm stock board such as the field of making aerospace, nuclear industry, communications and transportation, sports goods, weapons.
Technical solution of the present invention has also proposed a kind of method for preparing the tough Al-Li alloy of above-mentioned height, it is characterized in that: the step of this method is:
(1) prepares burden by the chemical ingredients and the weight percent requirement of alloy;
(2) melt in smelting furnace, temperature of fusion is 680 ℃～780 ℃;
(3) complete molten metal liquid is carried out refining, metal temperature maintains in 690 ℃～750 ℃ the scope during refining;
(4) should carry out sufficient standing after the refining, time of repose was not less than 30 minutes;
(5) begin casting behind the sufficient standing, the fire door temperature maintenance is in 700 ℃～720 ℃ scope, and casting rate is 15～200mm/ minute;
(6) in process furnace alloy cast ingot is carried out preferred homogenizing and handle, homogenization temperature is 450 ℃～520 ℃;
(7) ingot casting after the homogenizing is stripped off the skin after, carry out the arbitrary processes of hot extrusion and hot rolling system and be shaped, blank should remain on 350 ℃～480 ℃ temperature in the forming process;
(8) shaping back blank needs reach the product delivery status through solid solution, quenching and artificial aging thermal treatment.
In step (1)～(5) preferably with argon gas as shielding gas.
Step (3) preferably adopts vacuum refinement.
Step (3) preferably adopts 3～10% chlorine+argon gas mixed gas refining.
Step (3) preferably adopts C 2Cl 6The refining agent refining.
Preferred 470 ℃～585 ℃ of thermal treatment solid solubility temperature in the step (8).
After the solution treatment, preferably material is carried out cold deformation, and keep 1～5% set deformation volume in the step (8).
The timeliness thermal treatment selection process that thermal treatment is adopted in the step (8) was: 110 ℃～210 ℃ heating 1～64 hour.
Description of drawings
Fig. 1 for the present invention propose novel in the melting and casting flow process of strong high-ductility Al-Li alloy
Fig. 2 is a sheet alloy microstructure of the present invention
Embodiment
Below with reference to drawings and Examples technical solution of the present invention is described in detail further:
Table one provided proposed by the invention novel in strong high-ductility Al-Li alloy chemical ingredients and weight percent embodiment.
Table 1: strong high-ductility Al-Li alloy chemical ingredients and weight percent in novel surpassing
Ingot casting number Cu Li Mn Zn Zr Mg Ag Ti Fe Si
150 2.5 1.6 0.3 - 0.12 - - ＜0.12 ＜0.10 ＜0.10
151 2.8 1.4 0.2 - 0.10 - - ＜0.12 ＜0.10 ＜0.10
152 3.2 1.4 0.2 - 0.08 - - ＜0.12 ＜0.10 ＜0.10
153 3.1 1.7 0.5 - 0.15 - - ＜0.12 ＜0.10 ＜0.10
154 2.7 1.56 0.1 0.05 0.14 - - ＜0.12 ＜0.10 ＜0.10
155 2.9 1.7 0.4 0.10 0.15 - - ＜0.12 ＜0.10 ＜0.10
156 3.0 1.2 0.5 0.09 0.12 - - ＜0.12 ＜0.10 ＜0.10
157 3.2 1.1 0.5 0.15 0.12 - - ＜0.12 ＜0.10 ＜0.10
159 2.4 1.7 0.1 0.4 0.10 0.2 - ＜0.12 ＜0.10 ＜0.10
161 3.0 1.8 0.2 1.0 0.05 0.1 - ＜0.12 ＜0.10 ＜0.10
162 2.6 1.6 0.3 0.8 0.12 0.5 - ＜0.12 ＜0.10 ＜0.10
163 2.8 2.0 0.5 0.6 0.08 0.4 - ＜0.12 ＜0.10 ＜0.10
166 3.0 1.6 - - 0.12 0.3 0.3 ＜0.12 ＜0.10 ＜0.10
168 2.3 1.9 - - 0.12 0.4 0.6 ＜0.12 ＜0.10 ＜0.10
169 2.6 1.5 - - 0.08 0.5 0.4 ＜0.12 ＜0.10 ＜0.10
170 2.5 1.4 - - 0.16 0.5 0.4 ＜0.12 ＜0.10 ＜0.10
171 3.2 1.3 - - 0.14 0.8 0.2 ＜0.12 ＜0.10 ＜0.10
172 2.8 1.8 - - 0.16 0.7 0.6 ＜0.12 ＜0.10 ＜0.10
Shown in accompanying drawing 1, prepare above-mentioned in method (circuit one) step of strong high-ductility Al-Li alloy be:
(1) by the chemical ingredients and the weight percent requirement batching of alloy, can select to add 1～5 kind among micro alloying element Mn, Zn, Mg, Ag and the Zr;
(2) melt in smelting furnace, temperature of fusion is 680 ℃～780 ℃;
(3) complete molten metal liquid is carried out refining, it is equivalent adopting different refining media or refining mode, and metal temperature maintains in 690 ℃～750 ℃ the scope during refining;
(4) should carry out sufficient standing after the refining, time of repose was not less than 30 minutes;
(5) begin casting behind the sufficient standing, the fire door temperature maintenance is in 700 ℃～720 ℃ scope, and casting rate is 15～200mm/ minute, is cast into δ 250mm slab ingot;
(6) in process furnace alloy cast ingot is carried out preferred homogenizing and handle, homogenization temperature is 450 ℃～520 ℃;
(7) ingot casting after the homogenizing is stripped off the skin after, carry out hot rolling and make specific standard slab between 10mm～180mm, blank should remain on 350 ℃～480 ℃ temperature in the forming process;
(8) slab thermal treatment solid solubility temperature is 470 ℃～585 ℃; After the solution treatment, slab is carried out cold deformation, the set deformation volume of reservation is controlled to be 1～8%; Sheet material carried out timeliness thermal treatment after the preliminary draft, and technology is: at 110 ℃～210 ℃/1～64 hour.
Ingot casting number is that 166,168 ingot casting adopts 3～10% chlorine+argon gas mixed gas refining; Ingot casting number is that 169,170 ingot casting adopts the refining of C2Cl6 refining agent; All the other ingot castings adopt vacuum refinement.
Band for the following specification of 80mm, its technology (circuit two) and different being of above-mentioned technology (circuit one): 1, adopt specific standard band between the hot-pressed 10mm of making～80mm in step (7), blank should remain on 350 ℃～420 ℃ temperature in the forming process; 2, in step (7) after the preliminary draft band aging thermal treating process be: at 140 ℃～175 ℃/2～10 hours.
Table 2 is route one plate property.
Table 2
Figure BSA00000319922300051
Table 3 is route two band performances
Table 3
Figure BSA00000319922300052
159 535 512 12.8 66.0
161 533 512 12.6 66.2
162 531 514 11.3 66.4
163 530 516 12.6 66.3
By to analyzing as can be seen from the sheet alloy microstructure of above-mentioned performance and accompanying drawing 2, of the present invention novel in strong high-ductility Al-Li alloy material microstructure evenly, stable performance, can good application arranged in fields such as aerospace, nuclear industry, communications and transportation, sports goods, weapons.

Claims (11)

1. strong high-ductility Al-Li alloy in a kind, it is characterized in that: the chemical ingredients of alloy and weight percent are: Cu 2.2～3.2%, and Li 1.1～2.0%, Si≤0.10%, Fe≤0.10%, Ti≤0.12%, other impurity is single≤and 0.05%, total amount≤0.15%, surplus is Al.
2. strong high-ductility Al-Li alloy in according to claim 1, it is characterized in that: in the chemical ingredients of this alloy, add 1～5 kind among Mn, Zn, Mg, Ag and the Zr, the weight percent that adds is: Mn 0.10～0.70%, Zn 0.05～1.0%, Zr 0.05～0.16%, Mg≤0.10%～0.80%, Ag0.2～0.6%.
3. strong high-ductility Al-Li alloy in according to claim 1 is characterized in that: this alloy is applicable to 10mm～180mm stock board such as the field of making aerospace, nuclear industry, communications and transportation, sports goods, weapons.
4. be used for preparing the method for aforesaid right requirement 1 described strong high-ductility Al-Li alloy, it is characterized in that: the step of this method is:
(1) prepares burden by the chemical ingredients and the weight percent requirement of alloy;
(2) melt in smelting furnace, temperature of fusion is 680 ℃～780 ℃;
(3) complete molten metal liquid is carried out refining, metal temperature maintains in 690 ℃～750 ℃ the scope during refining;
(4) should carry out sufficient standing after the refining, time of repose was not less than 30 minutes;
(5) begin casting behind the sufficient standing, the fire door temperature maintenance is in 700 ℃～720 ℃ scope, and casting rate is 15～200mm/ minute;
(6) in process furnace alloy cast ingot is carried out preferred homogenizing and handle, homogenization temperature is 450 ℃～520 ℃;
(7) ingot casting after the homogenizing is stripped off the skin after, carry out arbitrary processes such as hot extrusion and hot rolling system and be shaped, blank should remain on 350 ℃～480 ℃ temperature in the forming process;
(8) shaping back blank needs reach the product delivery status through solid solution, quenching and artificial aging thermal treatment.
5. the method for strong high-ductility Al-Li alloy is characterized in that: all adopt argon shield in step (1)～(5) in the preparation according to claim 4.
6. the method for strong high-ductility Al-Li alloy in the preparation according to claim 4 is characterized in that: step (3) adopts vacuum refinement.
7. the method for strong high-ductility Al-Li alloy in the preparation according to claim 4 is characterized in that: step (3) adopts 3～10% chlorine+argon gas mixed gas refining.
8. the method for strong high-ductility Al-Li alloy in the preparation according to claim 4 is characterized in that: step (3) adopts C 2Cl 6The refining agent refining.
9. the method for strong high-ductility Al-Li alloy in the preparation according to claim 4 is characterized in that: the thermal treatment solid solubility temperature is 470 ℃～585 ℃ in the step (8).
10. the method for strong high-ductility Al-Li alloy in the preparation according to claim 4 is characterized in that: after the solution treatment, material is carried out cold deformation, and keep 1～5% set deformation volume in the step (8).
11. the method for strong high-ductility Al-Li alloy in the preparation according to claim 4, it is characterized in that: heat treated aging thermal treating process was in the step (8): 110 ℃～210 ℃ heating 1～64 hour.
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CN103993204A (en) * 2014-06-13 2014-08-20 苏州列治埃盟新材料技术转移有限公司 Low-anisotropy aluminum-lithium alloy bar and production method thereof
CN104018034A (en) * 2014-06-13 2014-09-03 苏州列治埃盟新材料技术转移有限公司 Lightweight aluminum-lithium alloy material and production method thereof.
CN104018033A (en) * 2014-06-13 2014-09-03 苏州列治埃盟新材料技术转移有限公司 Tin/zinc/manganese-added aluminum-lithium alloy material and production method thereof
US8845827B2 (en) 2010-04-12 2014-09-30 Alcoa Inc. 2XXX series aluminum lithium alloys having low strength differential
CN104213057A (en) * 2014-09-15 2014-12-17 河南科技大学 Copper-plated carbon fiber reinforced aluminum-lithium alloy composite material and preparation method thereof
CN104332586A (en) * 2014-09-02 2015-02-04 惠州亿纬锂能股份有限公司 Production method and production equipment of ultrathin lithium belt
CN105063519A (en) * 2015-07-15 2015-11-18 浙江中金铝业有限公司 Aluminum alloy milling surface homogenization process
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CN107779705A (en) * 2017-12-07 2018-03-09 中国航发北京航空材料研究院 A kind of aluminium lithium alloy and milling method
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CN111020322A (en) * 2019-12-10 2020-04-17 江苏豪然喷射成形合金有限公司 High-strength high-toughness aluminum-lithium alloy plate for aerospace and manufacturing method thereof
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CN109182807A (en) * 2018-09-20 2019-01-11 北京新立机械有限责任公司 A kind of high intensity aluminium lithium alloy and preparation method thereof
CN109182807B (en) * 2018-09-20 2020-06-30 北京新立机械有限责任公司 High-strength aluminum-lithium alloy and preparation method thereof
CN111020322A (en) * 2019-12-10 2020-04-17 江苏豪然喷射成形合金有限公司 High-strength high-toughness aluminum-lithium alloy plate for aerospace and manufacturing method thereof
CN111621682A (en) * 2020-06-29 2020-09-04 宁波锦越新材料有限公司 Al-Li light aluminum alloy and preparation method thereof
CN111893335A (en) * 2020-08-05 2020-11-06 郑州轻研合金科技有限公司 Method for regenerating and recycling scrap of aluminum-lithium alloy waste
CN111893335B (en) * 2020-08-05 2021-09-28 郑州轻研合金科技有限公司 Method for regenerating and recycling scrap of aluminum-lithium alloy waste
CN113667870A (en) * 2021-08-09 2021-11-19 江西理工大学 High-stress corrosion resistant aluminum-copper-lithium alloy material
CN113621854A (en) * 2021-08-23 2021-11-09 中南大学 Low-density high-modulus high-strength aluminum alloy and preparation method thereof
CN114054531A (en) * 2021-11-18 2022-02-18 西南铝业（集团）有限责任公司 Extrusion method of high-uniformity 2196 aluminum lithium alloy profile
CN114086044A (en) * 2022-01-24 2022-02-25 中铝材料应用研究院有限公司 Light high-strength Al-Cu-Li alloy extrusion material and processing method thereof
CN114086044B (en) * 2022-01-24 2022-05-17 中铝材料应用研究院有限公司 Light high-strength Al-Cu-Li alloy extrusion material and processing method thereof

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